{"title":"Hydrangeas \u0026 ericaceous","description":"\u003cp\u003e\u003cstrong\u003eEricaceous feed\u003c\/strong\u003e is for acid-loving plants — rhododendrons, azaleas, camellias, blueberries, and hydrangeas you want to keep blue. It is a soil-pH and specialist-nutrition job, not a general rose feed.\u003c\/p\u003e\n\u003ch2\u003eHydrangea feed and ericaceous plant food: start with the soil\u003c\/h2\u003e\n\u003cp\u003eHydrangeas, rhododendrons, azaleas, camellias, pieris and heathers share one demand that ordinary garden feeds ignore: they want the soil on the acid side. On chalky or limy ground their roots cannot take up iron and manganese, the young leaves go yellow between the veins, and no amount of general fertiliser puts it right. So a hydrangea feed or an ericaceous plant food is as much about the soil as the plant. This collection has the three things that matter: something to lower the pH, something to correct the magnesium that so often runs short alongside, and a balanced shrub feed that gives flower without pushing soft leafy growth.\u003c\/p\u003e\n\n\u003ch2\u003eWhat to feed hydrangeas\u003c\/h2\u003e\n\u003cp\u003eLess than most people think, and later than most people think. A hydrangea in reasonable soil wants one feed as growth starts in spring and, at most, a second in early summer; feeding into late summer produces soft shoots that the first frost takes. The feed itself should be balanced or leaning to potassium rather than nitrogen-heavy, which is why a lawn feed or a general high-nitrogen fertiliser gives you a big green plant with few flowers. \u003ca href=\"\/products\/organic-rose-fertiliser\"\u003eOrganic Rose \u0026amp; Shrub Fertiliser 5-3-5\u003c\/a\u003e is the one to reach for: slow release, balanced, with calcium and magnesium alongside the three main nutrients. For a hydrangea that is meant to be blue there is one further rule, covered below: keep phosphorus low, because it ties up the aluminium the colour depends on.\u003c\/p\u003e\n\u003cp\u003eIf the plant is in a pot, feeding matters more and the margin for error is smaller. Containers hold little in reserve, ericaceous compost is low in nutrients to begin with, and frequent watering leaches what is there. Feed little and often through spring and early summer, use rainwater where you can (tap water in hard-water areas is alkaline and slowly undoes the compost), and top-dress rather than repot every year.\u003c\/p\u003e\n\n\u003ch2\u003eEricaceous plant food: what it needs to be\u003c\/h2\u003e\n\u003cp\u003eThe label \"ericaceous\" on a feed means two things, and it is worth checking a product for both. First, it must not raise soil pH: no lime, no calcium carbonate, and nothing that leaves an alkaline residue. Second, it should carry the nutrients acid-loving plants run short of, chiefly magnesium and iron, in forms that stay available at low pH. Everything in this collection passes the first test. \u003ca href=\"\/products\/kieserite-magnesium-sulphate-fertiliser\"\u003eKieserite\u003c\/a\u003e and \u003ca href=\"\/products\/polyhalite\"\u003ePolyhalite\u003c\/a\u003e are neutral mineral sulphates and do not move pH; \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e lowers it; and the Rose \u0026amp; Shrub 5-3-5 supplies the balanced feed. An azalea fertiliser or a rhododendron feed is the same specification under a different name: the plants are close relatives and want the same things.\u003c\/p\u003e\n\n\u003ch2\u003eLowering soil pH: sulphur\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e is elemental sulphur in bentonite pastilles. Soil bacteria convert it slowly to sulphuric acid, which is why it works over months rather than days and why it is the safest way to bring a bed down towards the pH 4.5 to 5.5 that rhododendrons and blueberries prefer. \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-increase-or-decrease-your-soil-ph\"\u003eHow to increase or decrease your soil pH\u003c\/a\u003e explains how much change to expect and how to measure it. A soil pH test before and after is worth far more than guessing: on a strongly alkaline garden the honest advice is often a large container of ericaceous compost rather than a long campaign against the ground.\u003c\/p\u003e\n\n\u003ch2\u003eYellow leaves between the veins: magnesium\u003c\/h2\u003e\n\u003cp\u003eInterveinal yellowing on the older leaves of a rhododendron or hydrangea is usually magnesium, particularly on light acid soils and after heavy potassium feeding. \u003ca href=\"\/products\/kieserite-magnesium-sulphate-fertiliser\"\u003eKieserite\u003c\/a\u003e supplies magnesium as a mineral sulphate, and \u003ca href=\"\/products\/organic-liquid-magnesium\"\u003eLiquid Magnesium\u003c\/a\u003e is the faster option through a watering can. If the yellowing is on the young leaves instead, the problem is more likely to be iron locked up by high pH, and the answer is the sulphur above rather than more feed.\u003c\/p\u003e\n\n\u003ch2\u003eFeeding camellias and rhododendrons\u003c\/h2\u003e\n\u003cp\u003eCamellias and rhododendrons are shallow-rooted, slow to respond, and commonly short of magnesium, which shows as older leaves yellowing from the edges inwards while the veins stay green. They resent salt, so little and often beats one heavy dose, and they resent disturbance, so feed onto the surface and mulch rather than forking anything in. \u003ca href=\"\/products\/polyhalite\"\u003ePolyhalite\u003c\/a\u003e suits them well: potassium, calcium, magnesium and sulphur in one slow-release granule that does not raise pH. The calcium in it is the one thing to weigh up. A camellia or rhododendron on the borderline of tolerance will not thank you for more of it, so on ground that is already near neutral, use kieserite for the magnesium instead. \u003ca href=\"\/products\/organic-seaweed-powder-concentrated-100-soluble-fertiliser-dr\"\u003eSeaweed Extract Powder\u003c\/a\u003e and \u003ca href=\"\/products\/fulvic-acid\"\u003eFulvic Acid Powder\u003c\/a\u003e are the biostimulant options, the second of them useful because fulvic acid keeps iron and other trace elements in a form the plant can take up when the soil chemistry is working against it.\u003c\/p\u003e\n\n\u003ch2\u003eBlue hydrangeas\u003c\/h2\u003e\n\u003cp\u003eFlower colour in the mophead and lacecap hydrangeas follows aluminium, not any feed as such. Aluminium becomes available to the plant only once the soil is acid enough, roughly pH 5.5 or below, so on acid ground the same plant is blue and on chalk it is pink. Two things follow. Sulphur is the tool, applied over a season or two with a pH test to see where you are. And phosphorus is the enemy: it binds aluminium in the soil, which is why a high-phosphorus bloom feed will hold a hydrangea pink however acid the ground and why there is no bloom booster in this collection. White hydrangeas do not change colour whatever you do. Blueberries want the same acid soil and the same low-phosphorus feeding; they are covered with the rest of the fruit in \u003ca href=\"\/collections\/fruit-trees-soft-fruit\"\u003eFruit Trees \u0026amp; Soft Fruit\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eCommon questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the best feed for hydrangeas?\u003c\/h3\u003e\n\u003cp\u003eA balanced slow-release feed in spring, with the Rose \u0026amp; Shrub 5-3-5 as the one we make for the job, plus magnesium if the older leaves are yellowing between the veins. The best feed for a blue hydrangea is the same feed with sulphur alongside it and no added phosphorus. Nothing in a bottle beats getting the soil pH right first.\u003c\/p\u003e\n\u003ch3\u003eWhich product do I need to make my hydrangea blue?\u003c\/h3\u003e\n\u003cp\u003eSulphur, applied over a season or two, plus a pH test to see where you are. Blue needs the soil acid enough for aluminium to be available; in a strongly alkaline garden it may be easier to grow the plant in a large container of ericaceous compost.\u003c\/p\u003e\n\u003ch3\u003eCan I use ericaceous compost instead of sulphur?\u003c\/h3\u003e\n\u003cp\u003eFor a container, yes. In open ground, ericaceous compost mulched on top does very little to the pH of the soil beneath it; sulphur worked into the root zone is what changes the number.\u003c\/p\u003e\n\u003ch3\u003eWhen should I stop feeding?\u003c\/h3\u003e\n\u003cp\u003eBy midsummer for anything in this group. Late feeding gives soft growth that does not ripen before winter, and on camellias it can cost you next spring's buds.\u003c\/p\u003e\n\u003ch3\u003eIs it safe for pets and wildlife?\u003c\/h3\u003e\n\u003cp\u003eElemental sulphur is a naturally occurring mineral. As with any soil input, keep pets off freshly treated ground until it has been watered in, and store it out of reach.\u003c\/p\u003e\n\n\u003cp\u003eFor roses and the rest of the flower garden, see \u003ca href=\"\/collections\/rose-flower-fertilisers\"\u003eRose \u0026amp; Flower Fertilisers\u003c\/a\u003e; for the wider question of building soil, \u003ca href=\"\/collections\/soil-improver\"\u003eSoil Improvers\u003c\/a\u003e.\u003c\/p\u003e\n","products":[{"product_id":"organic-rose-fertiliser","title":"Rose Feed | Organic 5-3-5","description":"\u003clink href=\"https:\/\/fonts.googleapis.com\" rel=\"preconnect\"\u003e\n\u003clink href=\"https:\/\/fonts.googleapis.com\/css2?family=Cormorant+Garamond:ital,wght@0,400;0,600;0,700;1,400\u0026amp;family=Jost:wght@300;400;500;600\u0026amp;display=swap\" rel=\"stylesheet\"\u003e\n\u003cstyle\u003e\n  \/* ── WRAPPER ── *\/\n  .drf-wrap { font-family: 'Jost', sans-serif; color: #1c2b1a; max-width: 100%; overflow-x: auto; box-sizing: border-box; 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gap: 14px; margin: 20px 0; }\n  .drf-rose-card { border: 1px solid #d4e4c8; border-top: 3px solid #2d6a2d; border-radius: 0 0 4px 4px; padding: 16px 18px; background: #fff; }\n  .drf-rose-name { font-family: 'Cormorant Garamond', serif; font-size: 16px; font-weight: 700; color: #1c3d1a; margin-bottom: 4px; }\n  .drf-rose-sub { font-size: 11px; color: #7a9a6a; font-weight: 500; margin-bottom: 8px; }\n  .drf-rose-body { font-size: 13px; line-height: 1.7; color: #4a5a48; }\n\n  \/* ── SHRUB TYPE CARDS — variant of the rose card ── *\/\n  .drf-shrub-card { border-top-color: #7a9a6a; }\n\n  \/* ── CALENDAR ── *\/\n  .drf-cal { width: 100%; border-collapse: collapse; font-size: 13px; margin: 16px 0 28px; }\n  .drf-cal th { background: #1c3d1a; color: #fff; padding: 8px 10px; text-align: left; font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; font-weight: 600; }\n  .drf-cal td { padding: 8px 10px; border-bottom: 1px solid #e8f0e4; vertical-align: top; font-size: 13px; color: #3a4a38; line-height: 1.5; }\n  .drf-cal tr:nth-child(even) td { background: #f8fbf6; }\n  .drf-cal-month { font-weight: 700; color: #1c3d1a; white-space: nowrap; }\n  .drf-cal-feed { font-weight: 700; color: #2d6a2d; }\n  .drf-cal-no { color: #9aaa8a; }\n\n  \/* ── MOBILE ── *\/\n  @media (max-width: 600px) {\n    .drf-tab-labels { grid-template-columns: repeat(3, 1fr); }\n    .drf-tab { padding: 9px 4px; font-size: 9px; letter-spacing: 0.04em; white-space: normal; word-break: break-word; }\n    .drf-h2 { font-size: 22px; }\n    .drf-ing-grid { grid-template-columns: 1fr; }\n    .drf-rose-grid { grid-template-columns: 1fr; }\n    .drf-panel { padding: 24px 0 16px; }\n  }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\u003c!-- CRITICAL: all elements are direct siblings inside ONE wrapper div --\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003c!-- RADIO INPUTS: 6 tabs — direct children of .drf-wrap, before tabs and panels --\u003e\n\u003cinput checked id=\"drf-rf1\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"drf-rf2\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"drf-rf3\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"drf-rf4\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"drf-rf5\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003cinput id=\"drf-rf6\" name=\"drf-rf-tabs\" type=\"radio\"\u003e\n\u003c!-- TAB LABELS: direct child of .drf-wrap --\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf1\"\u003eOverview\u003c\/label\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf2\"\u003eIngredients\u003c\/label\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf3\"\u003eHow to Use\u003c\/label\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf4\"\u003eRoses \u0026amp; Shrubs\u003c\/label\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf5\"\u003eThe Science\u003c\/label\u003e\n\u003clabel class=\"drf-tab\" for=\"drf-rf6\"\u003eFAQs\u003c\/label\u003e\n\u003c\/div\u003e\n\u003c!-- PANELS: direct child of .drf-wrap --\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 1 — OVERVIEW\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp1\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eRose \u0026amp; Shrub Fertiliser — 5-3-5 NPK, Made with Organic Ingredients\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-dark\"\u003e5-3-5 NPK\u003c\/span\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003ePremium Organic Blend\u003c\/span\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003eDual Fast \u0026amp; Slow Release\u003c\/span\u003e\n\u003cspan class=\"drf-badge drf-badge-gold\"\u003eBritish Handcrafted\u003c\/span\u003e\n\u003cspan class=\"drf-badge drf-badge-gold\"\u003eFull Ingredient Transparency\u003c\/span\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003eCompostable Packaging\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"drf-lead\"\u003eRose feed 5-3-5 from Dr Forest is a slow-release organic rose feed for roses, hydrangeas and flowering shrubs. The 5-3-5 NPK ratio balances vigorous cane and stem growth with the sustained potassium supply needed for bloom production, colour intensity, fragrance and repeat performance across a full season — without the high-nitrogen excess that pushes leafy growth at the expense of flowers.\u003c\/p\u003e\n\u003cp class=\"drf-body\"\u003eFrom first bud break in March to the final autumn flush — premium organic ingredients working across the full season. Fermented biochar and EM microorganisms improve soil biology permanently with every application. Yorkshire Polyhalite delivers four nutrients simultaneously from a single North Yorkshire mineral. Alfalfa Meal contributes triacontanol, the natural compound prized by rose growers for its effect on bud count and fragrance intensity. The blend is pH-neutral, so it feeds acid-loving shrubs such as camellias and rhododendrons without liming the soil they sit in. \u003cstrong\u003eThis is a fertiliser that improves the soil it feeds, not just the plants above it.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eWhat it does for roses and flowering shrubs\u003c\/h3\u003e\n\u003cdiv class=\"drf-qref\"\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eMore Blooms, Bigger Blooms\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eBalanced N and K at 5% each sustains both the vegetative structure and the bloom production demand simultaneously — the combination that produces a well-clothed, floriferous rose\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eStronger Fragrance\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eChloride-free potassium and triacontanol from Alfalfa Meal increase terpenoid and benzenoid synthesis — the volatile compounds responsible for the scent that distinguishes a great rose from an adequate one\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eLonger Vase Life\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eCalcium from Gypsum and Polyhalite builds cell wall rigidity in petals — thicker, more substantial flowers that hold their form longer in the garden and after cutting\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eDeeper, Richer Colour\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eChloride-free K drives anthocyanin synthesis — the pigments responsible for red and pink depth in roses and in shrub flowers alike. No muriate of potash anywhere in the formula\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eInduced Resistance\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eChitin is recognised by receptors in the plant cell membrane and primes the plant's own Systemic Acquired Resistance pathway — salicylic acid signalling and defence gene expression are raised before any challenge arrives. Silica Meal adds physical cell wall reinforcement. This is the plant's own response, not an applied treatment\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSuits Acid-Loving Shrubs\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eCalcium comes from gypsum, which is pH-neutral — it supplies Ca without raising soil pH the way lime does. That makes the blend usable on camellias, rhododendrons, azaleas and hydrangeas as well as on roses\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eA Richer Soil Every Year\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eFermented Biochar, EM microorganisms and humic acid build permanent soil biology — each application improves the rhizosphere for the seasons that follow\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cdiv class=\"drf-callout-label\"\u003eWhy 5-3-5 for roses and shrubs?\u003c\/div\u003e\n\u003cp\u003eUnlike fruiting plants that benefit from a high K:N ratio (2:1 or more), roses and flowering shrubs simultaneously produce substantial vegetative structure — canes, stems, laterals, leaves — and flowers across a long season. Equal N and K at 5% provides the balanced support for both. Phosphorus is intentionally modest at 3%: established woody plants have deep root systems and do not need high P, and excess phosphorus in the slightly acidic soils roses and most flowering shrubs prefer can interfere with micronutrient uptake. It is also the reason a low-P blend is the sensible choice around hydrangeas. This is a formula calibrated for how these plants actually grow — not derived from a general-purpose template.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cdiv class=\"drf-callout-label\"\u003eFeeding hydrangeas — an honest note on blue\u003c\/div\u003e\n\u003cp\u003eThe 5-3-5 ratio suits general flowering-shrub feeding, and it suits pink and white hydrangeas well. Blue is a different question, and it is worth being plain about it. Blue hydrangea colour depends on acidic soil and on aluminium being present in a plant-available form — it is not something an NPK ratio delivers. Phosphorus is the classic antagonist: it binds aluminium in the soil and takes it out of circulation, which is the usual reason blueing fails on a high-phosphorus feed. At 3% P this blend is modest and will not work against you. But if blue flowers are the goal, the limiting factor is your soil pH, not your fertiliser. Bring pH down with our \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e, and see the full \u003ca href=\"\/collections\/hydrangea-ericaceous\"\u003ehydrangea and ericaceous range\u003c\/a\u003e. This product feeds the plant; it does not change flower colour, and we do not claim that it does.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 2 — INGREDIENTS\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp2\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eIngredients — What They Are and Why\u003c\/h2\u003e\n\u003cp class=\"drf-body\"\u003eEvery ingredient contributes a specific, research-backed function. The formula combines traditional organic inputs — long proven by rose growers — with premium regenerative ingredients that permanently improve soil biology. No fillers. Nothing inert.\u003c\/p\u003e\n\u003cdiv class=\"drf-ing-grid\"\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eNitrogen Plant Extract\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🇬🇧 Cambridgeshire · Plant-derived · Controlled release\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#4a7a3a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eThe primary nitrogen carrier — plant-derived, mineralising through microbial protease activity over 6–8 weeks. At 5% N in the finished formula, the rate supports vigorous cane extension and dense, dark foliage without triggering the sappy, chlorotic new growth that excess N creates and that rose pathogens exploit. Also contributes phosphorus and potassium in organic form as it breaks down.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eSørensen, 1998 — plant-derived N mineralisation rates in horticultural soils\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eYorkshire Polyhalite\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🇬🇧 North Yorkshire · 50–60 day release\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#c49a3c\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eMined 1,200m below the North Sea — a unique four-nutrient mineral delivering 14% K₂O, 17% CaO, 6% MgO and 48% SO₃ simultaneously. The 50–60 day release rate provides sustained secondary nutrition through the mid and late season when successive flushes of bloom create the highest simultaneous demand for K, Ca and Mg. Entirely chloride-free — no muriate of potash, no chloride suppression of fragrance pathways.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eJohnston \u0026amp; Dawson, 2018 — polyhalite agronomic performance in horticultural crops\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eSulphate of Potash\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🪨 Mineral · Immediate release\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#b8873a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003e50% K₂O in immediately plant-available sulphate form — entirely chloride-free. Activates stomatal regulation, sugar transport to developing buds, anthocyanin pigment synthesis and cell wall construction from day one of application. Bridges the gap before Yorkshire Polyhalite's slower K release builds. The chloride-free sourcing is non-negotiable for preserving fragrance pathway chemistry in roses.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eZörb et al., 2014 — chloride effects on secondary metabolite synthesis in ornamentals\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eGypsum (Calcium Sulphate)\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🪨 Mineral · Immediate release\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#d4c4a0\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003e23.3% Ca and 18.6% S both immediately available as sulphate. Calcium is a structural component of cell walls — adequate Ca means thicker petals, stronger stems, longer vase life and significantly reduced petal drop in garden roses and cut stems. pH-neutral: unlike lime, gypsum supplies calcium without raising soil pH, making it safe across the full 6.0–7.0 range that roses prefer.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eBangerth, 1979 — calcium supply and cell wall development in ornamental flowers\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eAlfalfa Meal\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 Plant-based · Biostimulant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#6aaa5a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eThe standout ingredient for rose performance. Alfalfa Meal contains triacontanol — a natural plant growth regulator specifically studied in rose cultivation. Research shows triacontanol increases bud count, extends stem length and elevates secondary metabolite production including the terpenoid and benzenoid fragrance compounds. Long used by specialist rose growers; this formula incorporates it as a core ingredient rather than an add-on.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eRies \u0026amp; Houtz, 1983 — triacontanol as a plant growth regulator · Albrecht, 2010 — alfalfa in rose cultivation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eMealworm Frass\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 Sustainably reared · SAR activator\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#c49a52\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eContains chitin, which triggers Systemic Acquired Resistance — priming the rose's own defences against the three diseases most destructive to the genus: black spot (Diplocarpon rosae), powdery mildew (Podosphaera pannosa) and grey mould (Botrytis cinerea). Plants with active SAR mount faster, stronger responses to fungal attack, reducing infection severity without fungicide use. Also supplies background N and trace minerals as it mineralises.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eFransen et al., 2020 — chitin-induced SAR in ornamental crops\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eSilica Meal\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🪨 Mineral · Structural\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#d0d8d0\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eSilicon deposited in cell walls adds rigidity without brittleness. For roses this means canes and pedicels that carry heavy blooms without drooping, and a physical barrier at the cell wall against fungal hyphal penetration. Silica is rarely present at adequate concentrations in UK garden soils — it must be supplied. The reinforced cell walls also reduce entry points for aphid stylet insertion, which is particularly relevant in roses where soft new growth in spring is the primary aphid target.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eEpstein, 1999 — silicon in plant biology and disease resistance\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eSeaweed Meal\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 Biostimulant · Trace minerals\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#2d8a6e\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eProvides cytokinins that delay petal and leaf senescence — extending the display period of individual rose flushes. Betaines improve osmotic adjustment under drought stress, maintaining bloom production through dry spells. Mannitol acts as a carbon source for beneficial rhizobacteria. Natural auxins drive lateral root branching, improving the nutrient and water uptake capacity needed to sustain successive flushes of bloom on repeat-flowering varieties.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eCraigie, 2011 — seaweed biostimulants: mode of action and agronomic performance\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eBasalt Rock Dust\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🪨 Volcanic mineral · Slow release\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#6a6a7a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eRemineralises soils with a broad spectrum of silicate-bound trace elements including iron, manganese, zinc, copper and boron — the micronutrients most consistently deficient in managed UK garden soils after years of crop removal without adequate replacement. Basalt dissolves slowly through the action of soil acids and microbial activity, providing a long-term trace mineral reserve. Also improves soil structure by adding fine mineral particles that increase cation exchange capacity.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eLeonardos et al., 1987 — rock powders and soil remineralisation in horticultural systems\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eClay Minerals\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🇬🇧 British · CEC reservoir\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#c8a880\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eHigh cation exchange capacity — binds and slowly releases K, Ca and Mg between waterings. Particularly valuable for roses in containers or on light, sandy soils where nutrient leaching is the primary cause of mid-season deficiency and mid-season colour fade. Also improves water-holding capacity around the root zone, which is critical for roses in dry summers when erratic soil moisture disrupts the transpiration stream and causes calcium delivery failures.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eSposito, 2008 — cation exchange in clay minerals and plant nutrition\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eFermented Biochar\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 British · Permanent soil benefit\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#3a2a1a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eBritish-sourced biochar fermented with EM microorganisms before blending — pre-colonised with beneficial microbial populations that establish more rapidly in the root zone. Creates a permanent porous mineral scaffold in the rhizosphere that retains water and nutrients between applications. Unlike organic matter, biochar does not decompose — every application deposits permanent infrastructure. Increases plant-available K retention by 18–35% under leaching conditions, which is directly relevant for container roses.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eLehmann et al., 2011 — biochar and K retention in horticultural substrates\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eEM Microorganisms\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 Living culture · Rhizosphere biology\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#4a7a5a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eEffective Microorganisms — a consortium of beneficial bacteria, yeasts and lactic acid bacteria — suppress pathogenic microorganisms through competitive exclusion, accelerate organic matter breakdown and produce bioactive compounds that promote root growth. In roses specifically, EM application consistently improves secondary metabolite production — the fragrance and colour compounds that distinguish a well-grown rose. The living culture is incorporated at blending to activate the fermented biochar.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eHiga \u0026amp; Parr, 1994 — Effective Microorganisms and sustainable agriculture\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-card\"\u003e\n\u003cdiv class=\"drf-ing-header\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"drf-ing-name\"\u003eHumic \u0026amp; Fulvic Acid\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-origin\"\u003e🌿 Mineral organic · Chelation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-dot\" style=\"background:#5a3a0a\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-body\"\u003eChelates micronutrients — particularly iron and manganese — maintaining them in plant-available form across the slightly acidic pH that roses prefer, where these elements can become locked up in unavailable forms. Increases root proton pump activity and overall nutrient uptake efficiency. Research shows humic acid increases total soil bacterial biomass by 30–60% and stimulates mycorrhizal colonisation by 25–40% — creating a progressively more biologically active rhizosphere with each application.\u003c\/div\u003e\n\u003cdiv class=\"drf-ing-study\"\u003eNardi et al., 2009 · Zandonadi et al., 2010\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 3 — HOW TO USE\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp3\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eDirections for Use\u003c\/h2\u003e\n\u003cp class=\"drf-body\"\u003eRates are calibrated for the 5-3-5 NPK formula and apply to roses and to flowering shrubs alike. All g\/m² rates assume even surface distribution over the full root zone with light incorporation to 2–3cm depth. For new plantings or beds being prepared for the first time, apply at double the standard rate and work into the full planting depth before setting the plants in. Established plants skip that preparation dose and take the spring feed only. A single bush is not a square metre: use 30–50 g in the planting hole for one new plant, and the per m² rate across the root zone of a bed.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eHow to Apply\u003c\/h3\u003e\n\u003cdiv class=\"drf-steps\"\u003e\n\u003cdiv class=\"drf-step\"\u003e\n\u003cdiv class=\"drf-step-num\"\u003e1\u003c\/div\u003e\n\u003cdiv class=\"drf-step-body\"\u003e\n\u003cdiv class=\"drf-step-title\"\u003eWater first\u003c\/div\u003e\n\u003cdiv class=\"drf-step-text\"\u003eSoil should be moist before applying. If the soil is very dry, water thoroughly and allow to drain for 30 minutes. Never apply to bone-dry soil — the mineral fraction requires moisture to dissolve and begin moving into the root zone.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-step\"\u003e\n\u003cdiv class=\"drf-step-num\"\u003e2\u003c\/div\u003e\n\u003cdiv class=\"drf-step-body\"\u003e\n\u003cdiv class=\"drf-step-title\"\u003eSprinkle around the drip line\u003c\/div\u003e\n\u003cdiv class=\"drf-step-text\"\u003eDistribute evenly around the full root zone — apply from approximately 10cm out from the base canes or stems to the drip line of the canopy. Do not apply directly against the stem base. For climbing roses, distribute along the full length of the root run rather than concentrating at the plant base. On broad shrubs such as hydrangeas and rhododendrons the feeder roots sit under the outer half of the canopy, so work outwards to the drip line rather than mounding at the crown.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-step\"\u003e\n\u003cdiv class=\"drf-step-num\"\u003e3\u003c\/div\u003e\n\u003cdiv class=\"drf-step-body\"\u003e\n\u003cdiv class=\"drf-step-title\"\u003eLightly fork in\u003c\/div\u003e\n\u003cdiv class=\"drf-step-text\"\u003eGently incorporate to 2–3cm depth using a hand fork or border hoe. Avoid deep cultivation around roses — the fibrous feeder roots are concentrated in the top 15cm and are easily damaged. Rhododendrons, azaleas and camellias are shallower still and resent forking, so on these scatter over the surface and let the mulch and rain take it down. Light surface incorporation is all that is needed.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-step\"\u003e\n\u003cdiv class=\"drf-step-num\"\u003e4\u003c\/div\u003e\n\u003cdiv class=\"drf-step-body\"\u003e\n\u003cdiv class=\"drf-step-title\"\u003eWater in thoroughly\u003c\/div\u003e\n\u003cdiv class=\"drf-step-text\"\u003eWater within 24 hours of application. Apply before forecast rain when possible — it removes the need to water and ensures even penetration. In containers, water until it runs freely from the base to distribute the mineral fraction through the full root zone.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-divider\"\u003e\n\u003ch3 class=\"drf-h3\"\u003eRates — Garden Roses \u0026amp; Flowering Shrubs\u003c\/h3\u003e\n\u003cdiv class=\"drf-table-wrap\"\u003e\n\u003ctable class=\"drf-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eRose or Shrub Type\u003c\/th\u003e\n\u003cth\u003eRate per m²\u003c\/th\u003e\n\u003cth\u003eApplications per Season\u003c\/th\u003e\n\u003cth\u003eTiming\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eHybrid Tea roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2, optional third\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. A third only before mid-August.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eFloribunda roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2, optional third\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. A third only before mid-August.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eShrub roses (incl. English roses)\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. Stop by late July.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eClimbing roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e90–110g per m²\u003c\/td\u003e\n\u003ctd\u003e2, optional third\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. A third only on a warm wall, and only into early September. Otherwise stop by mid-August.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eRambling roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–90g per m²\u003c\/td\u003e\n\u003ctd\u003e2 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · immediately after flowering (July–August). Once-blooming — no mid-season feed needed.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eMiniature roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e50–65g per m²\u003c\/td\u003e\n\u003ctd\u003e2, optional third\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. A third only before mid-August. Lower rate, smaller root zone.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eGround cover roses\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e70–80g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March, then after the first flush. Optional third before mid-August for repeat-flowering varieties\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eHydrangea — mophead \u0026amp; lacecap (\u003cem\u003eH. macrophylla\u003c\/em\u003e)\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · June. Stop after June — these flower on last year's wood and need the summer to ripen it.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eHydrangea — paniculata \u0026amp; arborescens\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · late May · (optional) late June. These flower on current-season wood, so early feeding does the work.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eCamellia\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · after flowering (May–June). The post-flowering feed supports next year's bud set.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eRhododendron \u0026amp; azalea\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · immediately after flowering (May–June). Scatter on the surface — do not fork in over shallow roots.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eDeciduous flowering shrubs (philadelphus, weigela, buddleja, spiraea)\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · June · late July for late-flowering shrubs. Spring-flowering shrubs: feed again straight after flowering.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eLilac, viburnum \u0026amp; other woody shrubs\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e80–100g per m²\u003c\/td\u003e\n\u003ctd\u003e2–3 applications\u003c\/td\u003e\n\u003ctd\u003eLate March · June. Established specimens are generally content with the March feed alone.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"drf-h3\"\u003eRates — Containers \u0026amp; Pots\u003c\/h3\u003e\n\u003cdiv class=\"drf-table-wrap\"\u003e\n\u003ctable class=\"drf-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSituation\u003c\/th\u003e\n\u003cth\u003eInitial Charge\u003c\/th\u003e\n\u003cth\u003eTop-Dress\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003ePots \u0026amp; containers\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e3–4g per litre of compost\u003c\/td\u003e\n\u003ctd\u003e2g per litre · every 4 weeks\u003c\/td\u003e\n\u003ctd\u003eMix the initial charge evenly through the full compost volume before planting. 3g\/L for compost already containing slow-release nutrients; 4g\/L for plain or peat-free mixes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eStandard rose or shrub pot (15–20L)\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e45–80g\u003c\/td\u003e\n\u003ctd\u003e30–40g · every 4 weeks\u003c\/td\u003e\n\u003ctd\u003eApply around the inner perimeter of the pot, not mounded at the stem base. The same applies to potted hydrangeas, camellias and patio shrubs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"drf-h3\"\u003eNew Plantings — Soil Preparation\u003c\/h3\u003e\n\u003cdiv class=\"drf-table-wrap\"\u003e\n\u003ctable class=\"drf-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSituation\u003c\/th\u003e\n\u003cth\u003eRate\u003c\/th\u003e\n\u003cth\u003eMethod\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eBed preparation (pre-planting)\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e100–140g per m²\u003c\/td\u003e\n\u003ctd\u003eFork into the top 15–20cm before planting. This charges the root zone before the plant goes in — particularly important in rose beds and shrub borders that have not been fed for several seasons.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-plant\"\u003eIndividual planting hole\u003c\/td\u003e\n\u003ctd class=\"drf-rate\"\u003e30–50g per plant\u003c\/td\u003e\n\u003ctd\u003eMix into the soil removed from the planting hole before backfilling. Do not place fertiliser in direct contact with the roots — mix thoroughly with soil first.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-divider\"\u003e\n\u003cdiv class=\"drf-qref\"\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSoil pH\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eRoses prefer pH 6.0–7.0. Below 6.0, check with lime; above 7.5, consider elemental sulphur or ericaceous mulch. Do not over-lime — soil pH above 7.5 locks up iron and manganese.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eEricaceous shrubs\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eCamellias, rhododendrons, azaleas and hydrangeas want a lower pH than roses — around 5.0–6.0. This blend is pH-neutral and will not push soil pH up, but it is a feed rather than an acidifier. If your soil is alkaline, correct the pH separately with our \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSoil temperature\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eOrganic N fractions mineralise above 8°C soil temperature — typically mid-to-late March in most UK gardens. The mineral K and Ca fractions activate from day one regardless of soil temperature.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eStop date\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eMid-August for most roses. Late feeding produces soft cane growth that does not harden before frosts. Climbing roses on warm south-facing walls can be fed until early September. Flowering shrubs are best stopped earlier still — mophead and lacecap hydrangeas after their June feed, so the wood ripens.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSigns of overfeeding\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eVery dark, lush foliage with reduced flowering; soft sappy new shoots that attract aphids; excessive vegetative growth at the expense of buds. Halve the rate at the next application.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSigns of underfeeding\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003ePale yellow-green foliage; slow cane extension; smaller buds than previous years; interveinal yellowing on older leaves (likely magnesium deficiency). Apply at the upper end of the rate range.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eSafety\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eSafe for children, pets, beneficial insects and wildlife at recommended rates. Wash hands after use. Do not apply to waterlogged soil or immediately before heavy rain.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 4 — ROSES \u0026amp; SHRUBS\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp4\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eGrowing Roses \u0026amp; Flowering Shrubs — A Guide for New Growers\u003c\/h2\u003e\n\u003cp class=\"drf-lead\"\u003eRoses have a reputation for being difficult, and flowering shrubs a reputation for looking after themselves. Neither is quite right. In practice the basics are straightforward — and understanding them makes the difference between a plant that survives and one that thrives. This guide covers the main rose types, the flowering shrubs most often grown alongside them, the seasonal feeding rhythm, and what to watch for through the year.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eRose Types — Which One Do You Have?\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eRoses fall into a small number of groups with meaningfully different growing habits. Knowing your type helps you feed and prune at the right time. Flowering shrubs are covered in the section below this one.\u003c\/p\u003e\n\u003cdiv class=\"drf-rose-grid\"\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eHybrid Tea\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eClassic large-flowered bush rose · Repeat-flowering\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eThe traditional garden rose — upright bushes typically 90–150cm tall with large, high-centred blooms on long stems, one flower per stem. Varieties include Peace, Mister Lincoln, Elina, Just Joey. Highly bred, somewhat disease-susceptible, but produces the finest individual flowers. Needs 3–4 feeds per season. Hard prune in late February.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eFloribunda\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eCluster-flowered bush rose · Repeat-flowering\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eSimilar habit to hybrid teas but producing clusters of smaller flowers rather than single large blooms — giving a more continuous display with less gap between flushes. Varieties include Iceberg, Amber Queen, Sexy Rexy, Queen Elizabeth. Generally more disease-resistant than hybrid teas. Needs 3–4 feeds. Prune as hybrid teas but slightly less hard.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eShrub Rose \/ English Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eLarger, more relaxed habit · Most repeat-flower\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eA broad category including David Austin English roses (Gertrude Jekyll, Graham Thomas, Olivia), traditional shrub roses and species hybrids. Typically larger than bush roses (1.2–2.0m), with a more natural, arching habit and flowers in the old-fashioned cupped or quartered style. Generally good disease resistance. Needs 3 feeds. Prune lightly — reduce by one third in late February.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eClimbing Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eLong, stiff canes for training · Most repeat-flower\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eProduces long, stiff canes (1.8–4m+) that must be tied in to a support — wall, trellis, arch or pergola. Most modern climbers repeat-flower well. Varieties include Compassion, New Dawn, Climbing Iceberg, Generous Gardener. Train main canes horizontally or at an angle — this triggers lateral shoots that carry the flowers. Feed 3–4 times per season. Prune lightly in winter, cutting flowered laterals back to 2–3 buds.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eRambling Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eLong, flexible canes · Flowers ONCE in summer\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eRamblers produce very long, flexible canes (4–8m) covered in clusters of smaller flowers — typically in June–July — and do not repeat. Varieties include Rambling Rector, Paul's Himalayan Musk, Veilchenblau, Seagull. Excellent for covering large structures, arches and trees. Only 2 feeds needed (March and after flowering). Prune immediately after flowering by cutting flowered canes to the base — the new canes growing this year will flower next summer.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eMiniature Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eCompact (30–60cm) · Repeat-flowering\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eSmall plants with proportionally scaled flowers — ideal for containers, patio edges and windowboxes. Generally very disease-resistant and free-flowering. Feed at lower rates (50–65g\/m²) every 4–5 weeks. Particularly good in pots where the contained root zone benefits from the biochar component's improved nutrient retention.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eGround Cover Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eWide-spreading, low habit · Often repeat-flowers\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eWide, low-growing roses (30–60cm tall, spreading 1.2–2.0m) used to cover banks, suppress weeds and fill large spaces. Varieties include Surrey, Flower Carpet, Bonica. Generally very disease-resistant. Light pruning — trim annually with shears rather than careful individual cutting. 2–3 feeds per season at slightly lower rates than upright roses.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eStandard Rose\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eGrafted onto a tall stem · Repeat-flowering\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eAny of the above rose types grafted onto a single upright stem (60–120cm), producing a lollipop-shaped plant. The rose type determines feeding requirements — treat the canopy as you would the equivalent bush or shrub rose. Standard roses in containers need careful attention to watering and feeding as the elevated head is vulnerable to wind and the restricted root zone dries quickly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 class=\"drf-h3\"\u003eFlowering Shrub Types — Feeding and Habit\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eFlowering shrubs divide most usefully by \u003cem\u003ewhere the flowers come from\u003c\/em\u003e. A shrub that flowers on wood made last year needs its feeding finished early enough for that wood to ripen; a shrub that flowers on this year's growth can be fed later. Get that one distinction right and the rest follows.\u003c\/p\u003e\n\u003cdiv class=\"drf-rose-grid\"\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eHydrangea — Mophead \u0026amp; Lacecap\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003e\n\u003cem\u003eH. macrophylla\u003c\/em\u003e · Flowers on last year's wood\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eThe familiar round-headed and flat-headed hydrangeas, 1–2m, flowering July to September. They set next year's buds in late summer, so feeding must finish early enough for the wood to ripen — a March feed and a June feed is the whole programme. Leave the faded heads on over winter as frost protection and cut back to the first fat pair of buds in early spring. Flower colour is governed by soil pH and aluminium availability, not by the feed; see the note on blue below.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eHydrangea — Paniculata \u0026amp; Arborescens\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eCone and dome heads · Flowers on this year's wood\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eVarieties such as Limelight, Vanille Fraise and Annabelle. Because they flower on current-season growth they can be pruned hard in early spring and will still flower the same summer — which also makes them the more forgiving hydrangeas for a cold or exposed garden. Feed at bud break and again in late May to build the growth that will carry the flowers. Their colour is white through to green and pink as they age and is not pH-dependent, so soil acidity is not a factor here.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eCamellia\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eEvergreen · Acid soil · Flowers late winter to spring\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eGlossy evergreen shrubs flowering from February to May, before most of the garden has started. Next year's buds are set in mid-summer, which makes the feed straight after flowering the important one — and makes summer watering important too, since drought in July is the usual cause of bud drop the following spring. They want an acid soil, pH 5.0–6.0. This blend is pH-neutral and will not lime the ground beneath them. Site out of early morning sun so frosted buds thaw slowly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eRhododendron \u0026amp; Azalea\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eShallow-rooted · Acid soil · Spring flowering\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eBoth belong to the genus \u003cem\u003eRhododendron\u003c\/em\u003e — azaleas are simply the smaller, often deciduous members of it. The roots are fine and sit in the top few centimetres, so scatter feed on the surface and never fork it in. Feed at bud break and again immediately after flowering. Mulch with composted bark or leaf mould to keep the root zone cool and damp. On alkaline soil they will yellow between the leaf veins whatever you feed them, and the fix is soil pH rather than fertiliser.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eDeciduous Flowering Shrubs\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003ePhiladelphus, weigela, spiraea, deutzia · Flowers on last year's wood\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eThe workhorses of the mixed border. Nearly all of them flower on stems made the previous year, which gives one simple rule: prune immediately after flowering, taking a third of the oldest stems to the base, and feed at the same time so the plant has what it needs to build next year's flowering wood. A feed at bud break in late March and a second after flowering covers a mature shrub comfortably.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-card drf-shrub-card\"\u003e\n\u003cdiv class=\"drf-rose-name\"\u003eBuddleja \u0026amp; Late-Summer Shrubs\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-sub\"\u003eFlowers on this year's wood · Hard spring pruning\u003c\/div\u003e\n\u003cdiv class=\"drf-rose-body\"\u003eBuddleja, hardy fuchsia, caryopteris, perovskia and the like flower on growth made in the current season, so they are cut hard back in March and rebuild from the base each year. That is a large amount of growth to make in a short season, and it is the one group where a July feed genuinely earns its place. Buddleja in particular will flower on poor ground but flowers far better with a fed root zone.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cdiv class=\"drf-callout-label\"\u003eBlue hydrangeas — where the colour actually comes from\u003c\/div\u003e\n\u003cp\u003eMophead and lacecap hydrangeas turn blue when the soil is acidic — roughly pH 5.5 and below — and aluminium is present in a form the roots can take up. Above that, the same plant flowers pink. White varieties stay white whatever you do. Phosphorus is the antagonist in this: it binds aluminium into insoluble compounds and takes it out of reach, which is why a high-phosphorus feed is the usual reason blueing fails. At 3% P this blend is modest and will not obstruct you, but it is a fertiliser, not a colourant, and it will not turn a pink hydrangea blue on its own. If blue is the goal, the work is in the soil: lower the pH with our \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e and keep it there, and see the \u003ca href=\"\/collections\/hydrangea-ericaceous\"\u003ehydrangea and ericaceous range\u003c\/a\u003e for the rest.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-divider\"\u003e\n\u003ch3 class=\"drf-h3\"\u003eThe Seasonal Feeding Calendar\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eTiming matters as much as rate. The calendar below is built around roses, which have the longest feeding season of anything in this group; the notes say where flowering shrubs and hydrangeas step off it.\u003c\/p\u003e\n\u003cdiv class=\"drf-table-wrap\"\u003e\n\u003ctable class=\"drf-cal\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"width:14%\"\u003eMonth\u003c\/th\u003e\n\u003cth style=\"width:24%\"\u003eWhat the Plant is Doing\u003c\/th\u003e\n\u003cth style=\"width:28%\"\u003eFeeding Action\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eJanuary–February\u003c\/td\u003e\n\u003ctd\u003eDormant. No leaf, minimal root activity.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eDo not feed.\u003c\/td\u003e\n\u003ctd\u003eUse this time to prune (late February for most), clear old mulch, and check for overwintering pests and disease debris. Apply a fresh mulch of well-rotted compost after pruning. Leave last year's hydrangea heads on until the worst frosts have passed — they shelter the buds beneath them.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eLate March\u003c\/td\u003e\n\u003ctd\u003eFirst red buds breaking. Root activity resuming.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-feed\"\u003eFirst feed of the season.\u003c\/td\u003e\n\u003ctd\u003eThe trigger is bud break — visible red buds emerging from the canes. Apply around the drip line at the full season rate. This is the most important application of the year — it charges the root zone before the main growth flush begins. Flowering shrubs, hydrangeas included, take their first feed at the same point.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eApril–May\u003c\/td\u003e\n\u003ctd\u003eRapid cane and leaf extension. Bud initiation.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eNo feed needed if late March was done.\u003c\/td\u003e\n\u003ctd\u003eWatch for aphids on soft new growth — the chitin in Mealworm Frass will be priming SAR responses but this takes a few weeks. A seaweed liquid spray (not this product) can boost the SAR activation. Check soil moisture and water deeply if dry.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eLate May\u003c\/td\u003e\n\u003ctd\u003eBuds swelling. First flush approaching.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-feed\"\u003eNo feed yet if March was done.\u003c\/td\u003e\n\u003ctd\u003eThe next rose feed is after the first flush, not while the buds are still swelling. Hydrangea paniculata and arborescens can take a second feed now, since they flower on the growth they are making.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eJune\u003c\/td\u003e\n\u003ctd\u003eMain flush flowering. Deadheading begins.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eNo feed during peak flowering.\u003c\/td\u003e\n\u003ctd\u003eDeadhead spent flowers promptly — removing the developing hip redirects the plant's energy from seed production back to bud initiation. On ramblers, note which canes are carrying flowers this year: these will be removed after flowering, not next spring.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eLate June\u003c\/td\u003e\n\u003ctd\u003eFirst flush ending. New basal shoots emerging.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-feed\"\u003eSecond feed, after the first flush.\u003c\/td\u003e\n\u003ctd\u003eThis feed sustains the new basal shoots — the strong new canes from the base of the plant — which will carry next year's best flowers. It also initiates the second flush of bloom in repeat-flowering varieties. Ramblers: feed immediately after flowering instead. Mophead and lacecap hydrangeas: this is their last feed of the year, so the wood ripens before autumn.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eJuly\u003c\/td\u003e\n\u003ctd\u003eSecond flush developing. New canes extending.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eNo feed unless 5 weeks since last application.\u003c\/td\u003e\n\u003ctd\u003eA hot, dry July can cause stress — water deeply at the base rather than splashing foliage. Fungal diseases spread rapidly in humid conditions; ensure good airflow around the plant and remove any heavily infected leaves at the compost bin, not the compost heap.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eEarly August\u003c\/td\u003e\n\u003ctd\u003ePeak repeat-flowering. Late basal shoots.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-feed\"\u003eOptional third feed, before mid-August.\u003c\/td\u003e\n\u003ctd\u003eRepeat-flowering roses only, and skip it if growth is already strong. This is the last feed. Once-blooming roses (ramblers, some old garden roses) do not need it, and neither do flowering shrubs — they should already have finished.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eMid-August onwards\u003c\/td\u003e\n\u003ctd\u003eLate season flushes. Canes beginning to harden.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eStop all feeding.\u003c\/td\u003e\n\u003ctd\u003eLate feeding is one of the most common mistakes with roses, and with shrubs it is worse — a hydrangea that goes into autumn with soft, unripened wood loses next year's flower buds to the first hard frost. Late feeding produces growth that cannot harden before the first frosts, and that frost-killed growth provides entry points for disease and dieback. Let the plant transition naturally into autumn dormancy from mid-August.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eSeptember–November\u003c\/td\u003e\n\u003ctd\u003eLast flushes. Hips developing. Leaves yellowing.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eDo not feed.\u003c\/td\u003e\n\u003ctd\u003eSome roses produce attractive hips in autumn — if you want these, stop deadheading in September and let the last flowers set fruit. Clear fallen leaves promptly as they can harbour black spot spores. Do not compost infected leaves.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"drf-cal-month\"\u003eDecember\u003c\/td\u003e\n\u003ctd\u003eDormant.\u003c\/td\u003e\n\u003ctd class=\"drf-cal-no\"\u003eDo not feed.\u003c\/td\u003e\n\u003ctd\u003eA good time to order bare-root roses and bare-root shrubs for planting in January–March. Bare-root stock is the best-value way to build a rose garden or a shrub border — it establishes faster than containerised plants and is significantly cheaper.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-divider\"\u003e\n\u003ch3 class=\"drf-h3\"\u003eKey Principles for New Rose and Shrub Growers\u003c\/h3\u003e\n\u003cdiv class=\"drf-qref\"\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eDeadhead promptly\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eOn roses, remove spent flowers before the hip swells — each hip that forms uses energy the plant could direct to the next flush of buds. Cut back to the first outward-facing leaf with 5 leaflets. Mophead and lacecap hydrangeas are the exception: leave the faded heads on through winter and remove them in early spring.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eWater deeply, not often\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eRoses need water at depth — roots grow to 45–60cm in well-prepared soil. Frequent shallow watering keeps roots near the surface and makes the plant drought-susceptible. Water deeply once or twice a week in dry weather rather than little and often. Hydrangeas are the thirstiest shrub in this group and will wilt visibly on a hot afternoon; camellias need summer water to hold next spring's buds.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eMulch in spring\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eA 7–10cm layer of well-rotted compost or horse manure applied around the base in March retains soil moisture, suppresses weeds, and feeds the soil biology as it breaks down. Keep mulch away from the stem base. For camellias, rhododendrons and azaleas use composted bark or leaf mould rather than manure, which is often alkaline.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003ePrune at bud break\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003ePrune bush and shrub roses when the first buds break in late February — not in autumn. Autumn pruning removes the growth that protects the bud union through winter. Prune to outward-facing buds at a 45° angle just above the bud.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eKnow which wood flowers\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eThe single most useful thing to know about a flowering shrub. If it flowers on last year's wood — mophead hydrangea, philadelphus, weigela, forsythia — prune straight after flowering and finish feeding early. If it flowers on this year's wood — hydrangea paniculata, buddleja, caryopteris — prune hard in March and feed through spring.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eExpect some leaf marking\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eFoliar marking on roses and shrubs is close to universal in a UK summer and is rarely fatal to an established plant. Remove and dispose of affected leaves rather than composting them, keep the centre of the plant open so air moves through it, and choose varieties bred for resilience where you want a low-maintenance bed.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-item\"\u003e\n\u003cdiv class=\"drf-qref-label\"\u003eStop feeding in mid-August\u003c\/div\u003e\n\u003cdiv class=\"drf-qref-value\"\u003eThe single most common feeding mistake. Late feeding drives soft new growth that frost kills back to the wood, leaving open wounds. Feed stops mid-August. Let the last flushes flower and the plant harden naturally into autumn.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 5 — THE SCIENCE\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp5\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eThe Science Behind the Formula\u003c\/h2\u003e\n\u003cp class=\"drf-body\"\u003eThe 5-3-5 ratio is not a generic template. It reflects the nutritional reality of how roses and flowering shrubs grow — producing both a substantial woody structure and flowers simultaneously across a season that runs from March to October in the UK.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003ePotassium and fragrance — the direct relationship\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eFloral fragrance in roses is produced by volatile terpenoid and benzenoid compounds synthesised in the petal tissue. The terpenoid pathway — which produces the monoterpene geraniol, the sesquiterpene germacrene D, and related rose scent compounds — is potassium-dependent: K activates the enzymes and ATP-producing proton pumps required for terpenoid biosynthesis. Plants with inadequate K or with K supplied from chloride sources produce measurably lower concentrations of these compounds.\u003c\/p\u003e\n\u003cp class=\"drf-body\"\u003eEvery gram of K in this formula comes from chloride-free sources — Sulphate of Potash and Yorkshire Polyhalite. Muriate of potash (potassium chloride), the dominant K source in most garden fertilisers, delivers Cl⁻ ions that compete with K⁺ at cellular transporters and suppress secondary metabolite synthesis. The fragrance gap between roses fed with chloride-free K formulas and those fed with standard fertilisers is not subtle to anyone who grows both.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eTriacontanol and bud count\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eTriacontanol is a naturally occurring fatty alcohol present in Alfalfa Meal, first identified as a plant growth regulator in the 1970s by Ries and Houtz. Its mechanism involves activation of adenylate cyclase, raising intracellular cAMP levels and triggering cascades that increase the rate of meristematic cell division and secondary metabolite synthesis simultaneously. In rose-specific research, triacontanol application consistently increases the number of axillary buds that break and develop into flowering laterals — translating directly into more flowers per plant per flush. Professional rose growers have used alfalfa meal as a component of feeding programmes for decades; this formula incorporates it as a core ingredient.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eCalcium and petal quality\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eCalcium is a structural component of pectin in cell walls. In rose petals, adequate Ca means walls with sufficient rigidity to maintain petal form throughout the life of the flower — in the garden and after cutting. Low Ca produces petals that lose form rapidly, bruise easily, and absciss prematurely. Gypsum provides immediately available Ca; Yorkshire Polyhalite provides sustained Ca across 50–60 days. The combination ensures Ca is continuously available across the full flowering season, not just immediately after application.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eNitrogen calibration\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eAt 5% N, this formula is at the moderate end of the range for established roses. This is deliberate. Excess nitrogen in roses produces the conditions that create serious problems: the sappy, soft new growth that aphids colonise; the dense, poorly aerated canopy that creates the humid microclimate in which black spot and powdery mildew spread most rapidly; and the vigorous vegetative growth that produces canes and leaves at the expense of bud initiation. The organic nitrogen fractions in this formula mineralise progressively over 6–8 weeks — there is no nitrogen spike, no flush of sappy growth, and no sudden drop. The plant receives a consistent, moderate N supply that sustains growth without overwhelming it.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eSystemic Acquired Resistance via chitin\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eChitin — present in Mealworm Frass — is detected by pattern recognition receptors in plant cell membranes as a marker of fungal presence or insect feeding. Detection triggers a signalling cascade that activates Systemic Acquired Resistance pathways throughout the plant: salicylic acid accumulates, defence genes are upregulated, and the plant's capacity to mount rapid responses to subsequent pathogen attack is enhanced for weeks. For roses, which face consistent pressure from three major fungal pathogens, this priming effect is meaningfully useful — it does not prevent infection, but it significantly reduces the severity and spread of the diseases that inevitably arrive in a UK summer.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eHydrangea flower colour — what actually controls it\u003c\/h3\u003e\n\u003cp class=\"drf-body\"\u003eSepal colour in \u003cem\u003eHydrangea macrophylla\u003c\/em\u003e is produced by a single anthocyanin, delphinidin-3-glucoside. On its own that pigment is pink. It turns blue only when it forms a complex with an aluminium ion, stabilised by co-pigments in the sepal tissue. So the question is never what pigment the plant makes — it always makes the same one — but whether aluminium reaches the sepal in a form that can complex with it.\u003c\/p\u003e\n\u003cp class=\"drf-body\"\u003eThat comes down to two things, and neither of them is the NPK ratio on the bag. The first is soil pH: aluminium is soluble and root-available below roughly pH 5.5, and progressively locked up as pH rises. The second is phosphorus. Phosphate reacts with aluminium in the soil to form insoluble aluminium phosphate, removing it from solution — which is why a high-phosphorus feed is the most common reason a blueing programme quietly fails. At 3% P this formula sits at the modest end and will not work against an acidification programme, but we are not going to claim more than that: \u003cstrong\u003ethis is a fertiliser, and it does not change flower colour.\u003c\/strong\u003e If blue is the goal, the intervention is soil pH, applied with a sulphur-based acidifier and maintained over time. Pink and white hydrangeas, and the paniculata and arborescens types, are unaffected by any of this and simply want feeding.\u003c\/p\u003e\n\u003ch3 class=\"drf-h3\"\u003eReferences\u003c\/h3\u003e\n\u003cul class=\"drf-refs\"\u003e\n\u003cli\u003eRies, S. \u0026amp; Houtz, R. (1983) — Triacontanol as a plant growth regulator. \u003cem\u003eHortScience\u003c\/em\u003e, 18(5), 654–662\u003c\/li\u003e\n\u003cli\u003eZörb, C. et al. (2014) — Potassium in agriculture: status and perspectives. \u003cem\u003eJournal of Plant Physiology\u003c\/em\u003e, 171(9), 656–669\u003c\/li\u003e\n\u003cli\u003eBangerth, F. (1979) — Calcium-related physiological disorders of plants. \u003cem\u003eAnnual Review of Phytopathology\u003c\/em\u003e, 17, 97–122\u003c\/li\u003e\n\u003cli\u003eCraigie, J.S. (2011) — Seaweed extract stimuli in plant science and agriculture. \u003cem\u003eJournal of Applied Phycology\u003c\/em\u003e, 23, 371–393\u003c\/li\u003e\n\u003cli\u003eEpstein, E. (1999) — Silicon. \u003cem\u003eAnnual Review of Plant Physiology and Plant Molecular Biology\u003c\/em\u003e, 50, 641–664\u003c\/li\u003e\n\u003cli\u003eFransen, K. et al. (2020) — Chitin-induced resistance in ornamental plants against Botrytis cinerea. \u003cem\u003ePlant Pathology\u003c\/em\u003e, 69(3), 520–531\u003c\/li\u003e\n\u003cli\u003eHiga, T. \u0026amp; Parr, J.F. (1994) — Beneficial and effective microorganisms for a sustainable agriculture and environment. International Nature Farming Research Center\u003c\/li\u003e\n\u003cli\u003eJohnston, A.E. \u0026amp; Dawson, C.J. (2018) — Polyhalite as a fertiliser for sustainable farming. \u003cem\u003eProceedings 826, International Fertiliser Society\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eLehmann, J. et al. (2011) — Biochar effects on soil biota. \u003cem\u003eSoil Biology and Biochemistry\u003c\/em\u003e, 43(9), 1812–1836\u003c\/li\u003e\n\u003cli\u003eNardi, S. et al. (2009) — Physiological effects of humic substances on higher plants. \u003cem\u003eSoil Biology and Biochemistry\u003c\/em\u003e, 34(11), 1527–1536\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- ═════════════════════════════════════════════════════════════════\n         PANEL 6 — FAQs\n    ═════════════════════════════════════════════════════════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-rfp6\"\u003e\n\u003ch2 class=\"drf-h2\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq1\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq1\"\u003eWhen should I start feeding roses and shrubs in spring?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eBegin in late March to early April when you see the first buds breaking — red buds on rose canes, swelling buds on hydrangeas and deciduous shrubs. This is the signal that the plant has moved out of dormancy and root activity has resumed. Applying before bud break is premature: the organic nitrogen fractions require active soil microbial activity to mineralise, and cold soil slows this significantly. Apply around the drip line of the plant, water in well, and repeat every 4–5 weeks through to mid-August for roses. Flowering shrubs need fewer applications and should finish earlier — see the How to Use tab.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq2\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq2\"\u003eWhy is the NPK 5-3-5 rather than high potassium like a tomato feed?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eRoses and flowering shrubs produce both a large vegetative structure (canes, stems, leaves) and flowers simultaneously across a long season — they are not fruiting plants. Equal N and K at 5% provides balanced support for stem strength, leaf health and bloom production. Phosphorus at 3% is intentionally modest — established woody plants do not need high P, and excess phosphorus can compete with micronutrient uptake in the slightly acidic soils roses and most flowering shrubs prefer. Around hydrangeas a low-phosphorus feed is the sensible choice for a further reason, covered below.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq3\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq3\"\u003eHow often should I feed during the season?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eEvery 4–5 weeks from late March to mid-August for most garden roses. Once-blooming roses (ramblers, many old garden roses) need only two applications — one in March and one after flowering. Repeat-flowering roses benefit from three to four applications spread through the season. Flowering shrubs need less: two to three applications is normal, and mophead and lacecap hydrangeas should be finished by the end of June. Stop by mid-August for most rose varieties — late feeding encourages soft cane growth that is killed by autumn frosts.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq4\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq4\"\u003eCan I use it on all types of roses and flowering shrubs?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eYes — the 5-3-5 formula works for hybrid teas, floribundas, shrub roses (including English roses), climbing roses, ramblers, miniature roses and ground cover roses, and equally for hydrangeas, camellias, rhododendrons, azaleas, philadelphus, weigela, buddleja, lilac, viburnum and the general run of flowering shrubs. Because calcium comes from pH-neutral gypsum rather than lime, it is safe on the acid-loving shrubs as well. Feeding rates and timing vary by type — see the How to Use tab for the full table.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq5\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq5\"\u003eWill it improve the fragrance of my roses?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eYes — directly. Floral fragrance compounds in roses are potassium-dependent secondary metabolites. This formula uses exclusively chloride-free potassium (Sulphate of Potash and Yorkshire Polyhalite) — muriate of potash, the K source in cheaper fertilisers, suppresses these scent pathways. Alfalfa Meal adds triacontanol, which increases secondary metabolite production including fragrance compounds. The combination consistently produces stronger, more complex scent compared to plants given standard balanced feeds.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq6\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq6\"\u003eCan I use it on roses and shrubs in pots and containers?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eYes. For potted roses and shrubs, use 3–4g per litre of compost as an initial charge when potting, then top-dress at 2g per litre every 4 weeks. Always water very thoroughly after applying. The fermented biochar component helps retain potassium and other nutrients between waterings — particularly valuable for container roses and potted hydrangeas in free-draining terracotta pots that can dry quickly in summer.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq7\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq7\"\u003eWhen should I stop feeding in late summer?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eStop by mid-August for most garden roses. Late feeding encourages soft new cane growth that does not have time to lignify before the first frosts — this new growth is then killed back, leaving open wounds that can introduce disease. The exception is climbing roses on warm south-facing walls, which can be fed until early September as the wall warmth extends the hardening-off period. Flowering shrubs should stop earlier: mophead and lacecap hydrangeas after their June feed, most other shrubs by late July, so the wood has the rest of the summer to ripen.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq9\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq9\"\u003eWhat soil pH is best for roses and shrubs?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eRoses prefer slightly acidic to neutral soil, pH 6.0–7.0, with the ideal around 6.5. Below pH 6.0, manganese and aluminium can reach toxic levels; above pH 7.5, iron and manganese become locked up and yellow leaves appear. The humic and fulvic acid in this formula helps buffer micronutrient availability across a wider range, but soils significantly outside 6.0–7.0 should be adjusted with lime (too acidic) or sulphur (too alkaline). Camellias, rhododendrons, azaleas and hydrangeas want it lower, around 5.0–6.0. This blend is pH-neutral, so it will not push soil pH up underneath them, but it is a feed rather than an acidifier — for that use our \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq10\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq10\"\u003eCan I use it alongside a liquid rose or shrub feed?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eIt is compatible with \u003ca href=\"\/products\/organic-seaweed-powder-concentrated-100-soluble-fertiliser-dr\"\u003eSeaweed Extract Powder\u003c\/a\u003e and other low-nutrient biostimulant liquids. If using a liquid rose or shrub feed as well, reduce the dry powder application to half rate or skip that cycle — combining two full-rate programmes pushes nitrogen above what the plant can use efficiently, resulting in soft, disease-prone growth. The dry powder is the better baseline for sustained nutrition through the season; liquid feeds work best as a boost just before the main June flush.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq11\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq11\"\u003eCan I use this as a hydrangea feed?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eYes. Feeding hydrangeas is one of the main uses this blend is built for. The 5-3-5 ratio gives them the nitrogen for leaf and stem and the chloride-free potassium that supports flower substance, and the phosphorus is deliberately low — which matters more for hydrangeas than for most plants. Feed mophead and lacecap types at bud break in late March and again in June, then stop, so the wood ripens before autumn and next year's buds survive the winter. Hydrangea paniculata and arborescens flower on the current season's growth and can take their second feed in late May instead. Rates are in the How to Use tab.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq12\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq12\"\u003eWill this turn my hydrangeas blue?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eNo, and we would rather say so plainly than sell you something on a hope. Blue hydrangea colour is not produced by a fertiliser. It happens when the soil is acidic — around pH 5.5 and below — and aluminium is present in a form the roots can take up and carry to the sepal, where it complexes with the plant's own pigment. Phosphorus is the classic antagonist here: it binds aluminium into insoluble compounds and takes it out of circulation, which is why high-phosphorus feeds are the usual reason a blueing programme fails. At 3% P this blend is modest and will not obstruct you, but the limiting factor for blue flowers is your soil pH, not your feed. If that is your goal, lower the pH with our \u003ca href=\"\/products\/sulphur-soil-acidifier\"\u003eSulphur Soil Acidifier\u003c\/a\u003e and see the \u003ca href=\"\/collections\/hydrangea-ericaceous\"\u003ehydrangea and ericaceous range\u003c\/a\u003e. White varieties will not change colour whatever you do.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq13\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq13\"\u003eIs it suitable for camellias, rhododendrons and azaleas?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eYes. The calcium in this formula comes from gypsum, which is pH-neutral — unlike lime, it supplies calcium without raising soil pH, so it will not work against an acid soil the way a limed general fertiliser can. Feed at bud break and again immediately after flowering, which is when next year's buds are being set. Scatter it on the surface rather than forking it in: the roots of all three sit in the top few centimetres and are easily damaged. If the leaves are yellowing between the veins on an otherwise well-fed plant, the problem is soil pH locking up iron rather than a shortage of nutrients, and the fix is an acidifier.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq14\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq14\"\u003eWhen should I feed flowering shrubs, and how does it differ from roses?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eThe useful question is which wood the shrub flowers on. Shrubs that flower on last year's wood — mophead hydrangea, philadelphus, weigela, forsythia, deutzia — should be fed at bud break and again straight after flowering, then left alone so the new growth ripens. Shrubs that flower on this year's wood — hydrangea paniculata, buddleja, caryopteris, hardy fuchsia — are cut back hard in March and fed through spring and early summer, since they have a whole season's growth to build. Either way, flowering shrubs need fewer applications than a repeat-flowering rose and should finish earlier in the summer.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq15\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq15\"\u003eMy hydrangea has plenty of leaf but very few flowers. Is that a feeding problem?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eUsually not. On mophead and lacecap hydrangeas the most common cause is that the flower buds were lost — either pruned off in spring, or frosted, because these types carry next year's buds on the wood they made last summer. Cutting them back in autumn or early spring removes the flowers before they open. The second most common cause is too much shade. A high-nitrogen feed applied late in the season can contribute by pushing soft growth that never ripens, which is one reason this blend is moderate at 5% N and why we suggest stopping hydrangea feeding after June. If you want a hydrangea that tolerates hard spring pruning, grow a paniculata or arborescens type instead.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq-paa1\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq-paa1\"\u003eWhat is the best feed for roses?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eA slow-release feed with nitrogen and potash in balance and modest phosphorus, because roses build canes and leaf at the same time as they flower. That's this 5-3-5, with chloride-free potash and calcium from gypsum, which doesn't raise soil pH. For most bush roses, scatter 80–100 g per m² over the root zone in late March as the buds break and again after the first flush, lightly worked in and watered. Stop by mid-August so new growth can harden before frost. Good soil, sun and water at the roots matter as much as any feed.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq-item\"\u003e\n\u003cinput class=\"drf-faq-toggle\" id=\"drf-rfq-paa2\" type=\"checkbox\"\u003e\n\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-rfq-paa2\"\u003eWhat helps roses grow and flower well?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003eSun first: six hours or more. Then soil that drains but holds moisture, with a mulch of compost or well-rotted manure each spring, and a deep watering in dry spells rather than a daily sprinkle. Feed in late March and again after the first flush, deadhead repeat-flowerers through summer, and stop feeding by mid-August. Rose soil is happiest around pH 6.5. If a rose has plenty of leaf but few flowers, look at light and pruning before you reach for more fertiliser.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- end .drf-panels --\u003e\n\u003c\/div\u003e\u003c!-- end .drf-wrap --\u003e","brand":"Dr Forest","offers":[{"title":"1.5kg","offer_id":43233232060603,"sku":"DF-ROSE-1.5","price":11.5,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":43233232093371,"sku":"DF-ROSE-4","price":23.5,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":43233232126139,"sku":"DF-ROSE-9","price":44.0,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":44784891330747,"sku":"DF-ROSE-15","price":60.49,"currency_code":"GBP","in_stock":true},{"title":"30kg","offer_id":44784892543163,"sku":"DF-ROSE-30","price":120.0,"currency_code":"GBP","in_stock":true},{"title":"60kg","offer_id":44784892575931,"sku":"DF-ROSE-60","price":225.0,"currency_code":"GBP","in_stock":true},{"title":"120kg","offer_id":57086355439990,"sku":"DF-ROSE-120","price":420.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/premium-rose-flower-fertiliser-two-brown-paper-bags-labeled-750.webp?v=1785512768"},{"product_id":"polyhalite","title":"Polyhalite Fertiliser | 4-in-1 Mineral (K, Ca, Mg, S)","description":"\u003c!-- Dr Forest — Polyhalite Fertiliser Product Page (v2 — Design System v1.0 — GSC-tuned May 2026) --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- Prefix: pl --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-grn-dark:   #0F2A1F;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-cream:      #F5F2EC;\n    --drf-border:     #d4cfc5;\n    --drf-muted:      #3A4A40;\n    --drf-white:      #FFFFFF;\n  }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; font-weight: 600; font-size: 0.85em; letter-spacing: 0.2em; text-transform: uppercase; color: var(--drf-muted); margin: 1.2em 0 0.3em; }\n  .drf-wrap p { margin-bottom: 0.9em; }\n  .drf-wrap ul { padding-left: 1.2em; margin-bottom: 0.9em; }\n  .drf-wrap ul li { margin-bottom: 0.35em; }\n  .drf-wrap strong { font-weight: 500; color: var(--drf-grn); }\n  .drf-wrap em { font-style: italic; color: var(--drf-muted); }\n\n  \/* ── BADGES ── *\/\n  .drf-badge-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; margin: 0 0 12px; }\n  .drf-badge { padding: 9px 12px; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; justify-content: center; text-align: center; min-height: 36px; line-height: 1.3; }\n  .drf-badge-green { background: #eaf4ea; color: #2d6a2d; border: 1px solid #c0d8b0; }\n  .drf-badge-gold  { background: #fdf6e3; color: #8b6914; border: 1px solid #e0cc80; }\n  .drf-badge-dark  { background: var(--drf-grn-dark); color: #d4e4c8; border: 1px solid #2d6a2d; }\n\n  \/* ── STATS (white cards, gold top border on the grid) ── *\/\n  .drf-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--drf-border); border: 1px solid var(--drf-border); border-top: 2px solid var(--drf-gold); margin: 1.2em 0; max-width: 100%; }\n  .drf-stat { background: var(--drf-white); padding: 0.7em 0.5em; text-align: center; }\n  .drf-stat-number { font-family: 'Cormorant Garamond', serif; font-size: 1.45em; font-weight: 400; color: var(--drf-grn); line-height: 1.1; display: block; }\n  .drf-stat-label { font-size: 0.62em; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--drf-gold); display: block; margin-top: 0.3em; }\n\n  \/* ── TABS ── *\/\n  .drf-tabs-wrap { max-width: 100%; overflow: hidden; }\n  .drf-tabs-wrap input[type=\"radio\"] { display: none; }\n  .drf-tab-labels { display: flex; align-items: stretch; border-bottom: 2px solid var(--drf-border); margin-bottom: 1.2em; }\n  .drf-tab-labels label { flex: 1 1 0; padding: 0.75em 0.4em; font-size: 0.82em; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: #8b6914; background: var(--drf-gold-light); cursor: pointer; text-align: center; display: flex; align-items: center; justify-content: center; border-bottom: 3px solid var(--drf-gold); margin-bottom: -2px; transition: all 0.15s; }\n  .drf-tab-labels label:hover { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); }\n  .drf-panel { display: none; }\n  #drf-pl-tab1:checked ~ .drf-tab-labels label[for=\"drf-pl-tab1\"],\n  #drf-pl-tab2:checked ~ .drf-tab-labels label[for=\"drf-pl-tab2\"],\n  #drf-pl-tab3:checked ~ .drf-tab-labels label[for=\"drf-pl-tab3\"],\n  #drf-pl-tab4:checked ~ .drf-tab-labels label[for=\"drf-pl-tab4\"] { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); font-weight: 700; }\n  #drf-pl-tab1:checked ~ .drf-panels #drf-pl-panel1,\n  #drf-pl-tab2:checked ~ .drf-panels #drf-pl-panel2,\n  #drf-pl-tab3:checked ~ .drf-panels #drf-pl-panel3,\n  #drf-pl-tab4:checked ~ .drf-panels #drf-pl-panel4 { display: block; }\n\n  \/* ── CALLOUTS ── *\/\n  .drf-callout { background: var(--drf-grn-light); border-left: 3px solid var(--drf-grn); padding: 1em 1.2em; margin: 1.2em 0; }\n  .drf-callout-gold { background: var(--drf-gold-light); border-left-color: var(--drf-gold); }\n  .drf-callout-dark { background: var(--drf-grn-dark); color: var(--drf-cream); border-left-color: var(--drf-gold); }\n  .drf-callout-dark p { color: var(--drf-cream); }\n  .drf-callout-dark strong { color: var(--drf-gold); }\n  .drf-callout p:last-child { margin-bottom: 0; }\n  .drf-callout-title { font-size: 0.72em; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--drf-grn); margin-bottom: 0.4em; display: block; }\n  .drf-callout-gold .drf-callout-title { color: var(--drf-gold); }\n  .drf-callout-dark .drf-callout-title { color: var(--drf-gold); }\n\n  \/* ── PULL QUOTE ── *\/\n  .drf-pullquote { font-family: 'Cormorant Garamond', serif; font-style: italic; font-weight: 400; font-size: 1.4em; color: var(--drf-grn); text-align: center; padding: 1.4em 1em; margin: 1.8em auto; max-width: 80%; line-height: 1.5; border-top: 1px solid var(--drf-gold); border-bottom: 1px solid var(--drf-gold); }\n\n  \/* ── MECH CARDS ── *\/\n  .drf-mech { border: 1px solid var(--drf-border); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 0.8em 0; background: var(--drf-grn-light); }\n  .drf-mech-num { font-family: 'Cormorant Garamond', serif; font-size: 2em; font-weight: 400; color: var(--drf-gold); line-height: 1; }\n  .drf-mech h4 { margin-top: 0.2em; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-weight: 600; }\n  .drf-mech p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n\n  \/* ── RATE CARDS ── *\/\n  .drf-rate { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin: 0.8em 0; background: var(--drf-grn-light); }\n  .drf-rate h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.5em; margin-bottom: 0.6em; }\n  .drf-rate-meta { font-size: 0.85em; color: var(--drf-muted); margin-bottom: 0.5em; }\n  .drf-rate-meta strong { color: var(--drf-gold); }\n  .drf-rate p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n\n  \/* ── STEPS (square block numbers) ── *\/\n  .drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n  .drf-steps li { counter-increment: drf-step; padding: 0.8em 0 0.8em 3em; position: relative; border-bottom: 1px solid #eee; }\n  .drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.8em; width: 2em; height: 2em; background: var(--drf-grn); color: #fff; font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 0.9em; display: flex; align-items: center; justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n\n  \/* ── USE-CASE LIST (1px hairline borders) ── *\/\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 1px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn); }\n\n  \/* ── COMPARISON BOXES ── *\/\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* ── FAQ (square +\/- with gold border) ── *\/\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 600; color: var(--drf-grn); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.2em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border: 1px solid var(--drf-gold); background: transparent; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: var(--drf-muted); line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '−'; background: var(--drf-grn); color: #fff; border-color: var(--drf-grn); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 600px; }\n\n  \/* ── REFS \u0026 SEPARATOR (200px hairline) ── *\/\n  .drf-refs { font-size: 0.78em; color: #888; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 1px solid var(--drf-gold); width: 200px; margin: 1.8em auto; }\n\n  \/* ── TABLE ── *\/\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn); color: #fff; font-weight: 600; padding: 0.6em 0.8em; text-align: left; font-size: 0.85em; letter-spacing: 0.04em; }\n  .drf-wrap table td { padding: 0.55em 0.8em; border-bottom: 1px solid var(--drf-border); }\n  .drf-wrap table tr:nth-child(even) td { background: var(--drf-grn-light); }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput checked id=\"drf-pl-tab1\" name=\"drf-pl-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-pl-tab2\" name=\"drf-pl-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-pl-tab3\" name=\"drf-pl-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-pl-tab4\" name=\"drf-pl-tabset\" type=\"radio\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-pl-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-pl-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-pl-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-pl-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═══════════ TAB 1 — OVERVIEW ═══════════ --\u003e\n\u003cdiv id=\"drf-pl-panel1\" class=\"drf-panel\"\u003e\n\u003ch2\u003ePolyhalite fertiliser — four macronutrients in one Yorkshire mineral\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003eMined in Yorkshire\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e4 Macronutrients\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eEU Organic Approved\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eDissolves Gradually\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eLow in Chloride\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eRecyclable Packaging\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.drforest.co.uk\/products\/polyhalite\"\u003eDr Forest Polyhalite Fertiliser\u003c\/a\u003e is a naturally occurring mineral fertiliser that supplies four macronutrients (potassium, calcium, magnesium and sulphur) from a single Yorkshire crystal, applied at 50 to 125 g\/m² on beds every 6 to 12 weeks or 35 to 70 g\/m² on lawns two or three times a year.\u003c\/strong\u003e It's mined from beneath the North Yorkshire coast at Boulby — the world's only currently operating commercial polyhalite mine — and arrives in the bag exactly as it left the ground: crushed, screened, granulated. No chemical processing, no synthetic additives. Because it's a sulphate-based potash mineral with virtually zero chloride, it's particularly valuable for chloride-sensitive crops like tomatoes, strawberries, potatoes and salad leaves.\u003c\/p\u003e\n\u003cp\u003eThis is the mineral that underpins every Dr Forest crop-specific blend — the primary source of potassium, calcium, magnesium and sulphur across the range, because nothing else delivers all four in a form that dissolves gradually from a single natural input. Think of it as a multi-nutrient upgrade on sulphate of potash: the same potash, low in chloride, plus the calcium, magnesium and sulphur most garden soils also need. A naturally mined mineral that is EU Organic Approved, crushed and granulated with no chemical refining. Now available as a straight, so you can apply the same mineral directly to your soil.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e14%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eK₂O · Potash\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e17%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCaO · Calcium\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e6%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMgO · Magnesium\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e48%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSO₃ · Sulphur\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat is polyhalite used for in the garden?\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eA potash source low in chloride\u003c\/strong\u003e — supplies 14% K₂O as potassium sulphate, the same potash as sulphate of potash (SOP), low in chloride, but with calcium, magnesium and sulphur alongside it\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase mineral amendment for all crops\u003c\/strong\u003e — delivers the four macronutrients most commonly deficient in containers, raised beds and intensively cropped soils, where leaching strips them out fastest\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium delivery without pH change\u003c\/strong\u003e — calcium sulphate doesn't raise soil pH the way lime does\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolves gradually for season-long feeding\u003c\/strong\u003e — University of Nottingham research confirms 50–60% of sulphur is immediately available, with the rest released over the growing season\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChloride-sensitive crops\u003c\/strong\u003e — tomatoes, strawberries, potatoes, peppers and salad leaves benefit from potassium delivered without chloride accumulation in the root zone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnesium supplementation\u003c\/strong\u003e — prevents interveinal chlorosis (yellowing between leaf veins) and activates over 300 plant enzymes, including those that build chlorophyll\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLawn and turf nutrition\u003c\/strong\u003e — potassium hardens turf for winter, calcium improves soil structure, sulphur supports colour and density\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil structure on heavy clay\u003c\/strong\u003e — calcium and magnesium displace sodium on clay particles, opening up drainage and aeration without altering pH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYield and fruit quality\u003c\/strong\u003e — a 921-trial meta-analysis across 47 crops in 33 countries showed polyhalite raised yields by 3.8–16.3% over standard NPK programmes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy polyhalite instead of buying K, Ca, Mg and S separately?\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003ePolyhalite — this product\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFour macronutrients in one natural granule — K, Ca, Mg, S\u003c\/li\u003e\n\u003cli\u003eDissolves gradually — nutrients available across the full growing season\u003c\/li\u003e\n\u003cli\u003eLow in chloride, low salt index — safe for all crops including chloride-sensitive ones\u003c\/li\u003e\n\u003cli\u003eMined, crushed, granulated — no chemical processing\u003c\/li\u003e\n\u003cli\u003eNaturally mined mineral, EU Organic Approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eBuying K, Ca, Mg, S as separate products\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSulphate of potash plus gypsum plus Epsom salt — three products, three bags\u003c\/li\u003e\n\u003cli\u003eAll fully soluble, so higher leaching losses and more frequent top-ups\u003c\/li\u003e\n\u003cli\u003eHigher total salt load from stacking soluble inputs\u003c\/li\u003e\n\u003cli\u003eHarder to balance the ratios without overloading one nutrient\u003c\/li\u003e\n\u003cli\u003eHigher cost per nutrient unit and more packaging in the bin\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eHandcrafted in Stockport\u003c\/span\u003e\n\u003cp\u003eEvery Dr Forest product is blended and packed by hand in small batches at our workshop in Stockport, Greater Manchester. Recyclable packaging throughout. Ingredients chosen for quality, not cost. New to polyhalite? Read \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-polyhalite\"\u003eWhat is polyhalite?\u003c\/a\u003e on the Dr Forest blog.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 2 — THE SCIENCE ═══════════ --\u003e\n\u003cdiv id=\"drf-pl-panel2\" class=\"drf-panel\"\u003e\n\u003ch2\u003eThe science of polyhalite fertiliser: four nutrients, low chloride\u003c\/h2\u003e\n\u003cp\u003eThis bag is Yorkshire polyhalite — one crystal supplying potassium, calcium, magnesium and sulphur as sulphates, with virtually no chloride. Mined, crushed and granulated; no chemical refining. It dissolves gradually from the crystal structure, which suits containers, beds and turf that need a season-long base rather than a soluble hit.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eNutrient\u003c\/th\u003e\n\u003cth\u003eContent\u003c\/th\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePotassium (K₂O)\u003c\/td\u003e\n\u003ctd\u003e14%\u003c\/td\u003e\n\u003ctd\u003eSulphate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalcium (CaO)\u003c\/td\u003e\n\u003ctd\u003e17%\u003c\/td\u003e\n\u003ctd\u003eSulphate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium (MgO)\u003c\/td\u003e\n\u003ctd\u003e6%\u003c\/td\u003e\n\u003ctd\u003eSulphate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulphur (SO₃)\u003c\/td\u003e\n\u003ctd\u003e48%\u003c\/td\u003e\n\u003ctd\u003eSulphate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eFull definition guide\u003c\/span\u003e\n\u003cp\u003eFormation, mining and how it compares to other potash sources: \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-polyhalite\"\u003eWhat is polyhalite?\u003c\/a\u003e — this tab stays SKU-short on purpose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n\u003cdiv id=\"drf-pl-panel3\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow to use polyhalite fertiliser: application rates\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eA base mineral — not a complete fertiliser\u003c\/span\u003e\n\u003cp\u003ePolyhalite contains \u003cstrong\u003eno nitrogen and no phosphorus\u003c\/strong\u003e. It supplies potassium, calcium, magnesium and sulphur. For a complete feeding programme, use it alongside a nitrogen and phosphorus source — a Dr Forest crop-specific blend (Tomato, Rose \u0026amp; Flower, Fruit \u0026amp; Veg) or an all-purpose NPK fertiliser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003ePolyhalite fertiliser application rates\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil mix — potting and container preparation\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 2.5–5g per litre of compost  |  \u003cstrong\u003eWhen:\u003c\/strong\u003e At planting\u003c\/div\u003e\n\u003cp\u003eMix thoroughly into compost or potting soil before planting. Because it dissolves gradually, it gives baseline calcium, magnesium, potassium and sulphur for the first 8–12 weeks. Ideal for all container crops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eTop-dressing — established containers\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10–30g per 10-litre pot  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 6–8 weeks during the growing season\u003c\/div\u003e\n\u003cp\u003eScatter granules evenly across the surface and water in. Because it dissolves gradually, applications are less frequent than with soluble alternatives. Particularly valuable for tomatoes, peppers and other heavy-feeding fruiting crops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eOutdoor beds and borders\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 50–125g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 6–12 weeks, spring to autumn\u003c\/div\u003e\n\u003cp\u003eBroadcast evenly across the soil surface and water in well. Lower rate for general maintenance, higher rate for heavy feeders, new plantings or clay improvement. Apply at planting and as a mid-season top-up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawns and turf\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 35–70g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e 2–3 times per year — spring, summer, autumn\u003c\/div\u003e\n\u003cp\u003eApply and water in. Potassium hardens turf for winter, calcium improves soil structure, sulphur supports colour and density. Polyhalite is used as part of professional turf nutrition programmes at the highest level, including Wimbledon's (\u003ca href=\"https:\/\/www.telegraph.co.uk\/news\/2023\/07\/09\/wimbledon-courts-fertiliser-green-grass-polyhalite-boulby\/\"\u003eThe Telegraph, 9 July 2023\u003c\/a\u003e).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eClay soil improvement\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 100–150g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Annually in autumn or spring\u003c\/div\u003e\n\u003cp\u003eThe calcium in polyhalite displaces sodium on clay particles, improving aggregate structure, drainage and workability. Unlike lime, it doesn't alter pH — so it's safe on all soil types. Work into the top 10–15cm where you can.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eOn fruit trees and soft fruit\u003c\/h3\u003e\n\u003cp\u003ePolyhalite gives fruit potash, magnesium, calcium and sulphur in one granule. It has no nitrogen or phosphorus, so it's a potash and magnesium top-up, not a complete feed. Keep using your usual fruit feed alongside it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore you start\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOnce a year is enough for fruit in the ground.\u003c\/strong\u003e Fruit uses far less potash per square metre than vegetables, so don't follow the beds-and-borders schedule of every 6–12 weeks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest your soil if you can.\u003c\/strong\u003e Soil that's already high in potash or magnesium doesn't need polyhalite, and too much potash does more harm than good, especially to apples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpread it where the roots are:\u003c\/strong\u003e evenly over the ground under the branches, out to the branch tips, or along the row. Keep it 30 cm from tree trunks, and off the stems of bushes, canes and strawberries, then water it in or rake it in lightly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring:\u003c\/strong\u003e a level tablespoon holds about 12–15 g.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTrees in the ground\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApples:\u003c\/strong\u003e none without a soil test. Only use it if a test shows low potash: 125 g per m² under the branches at Index 0 (low), 100 g per m² at Index 1, and none at Index 2 or above. Once a year in February–March. Too much potash on apples can spoil storage and make bitter pit (brown spots in the flesh) more likely, and polyhalite's calcium is \u003cstrong\u003enot\u003c\/strong\u003e a cure for bitter pit. If a test shows low magnesium but potash is fine, use Kieserite instead, because polyhalite always adds more potash than magnesium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlums, gages and damsons:\u003c\/strong\u003e 50–100 g per m² under the branches, once a year in February–March. Use the lower rate on good garden soil and the higher rate on light, sandy or hungry soil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFigs planted in the ground:\u003c\/strong\u003e figs fruit best on lean soil. A fig with its roots restricted (in a lined planting pit) can have one light dressing of 20–40 g per tree over the pit in March–April. A fig growing unrestricted in mulched soil needs nothing unless growth is weak (less than about 30 cm of new shoot a year). Give a fig only one spring feed, this or a general fruit feed, and never feed after midsummer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWalnuts:\u003c\/strong\u003e 50–100 g per m² under the branches, once a year in early spring before the leaves open. On good soil, walnuts need nothing in their first year. For a large tree that isn't cropping well, get a soil test first. Walnuts release natural compounds that affect neighbouring plants; no fertiliser changes that.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlmonds:\u003c\/strong\u003e 50–100 g per m² under the branches, once a year in February, before flowering. Otherwise as for walnuts. On young trees, keep granules at least 45 cm from the trunk.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSoft fruit in the ground\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackcurrants, redcurrants, gooseberries, raspberries:\u003c\/strong\u003e 85 g per m² with no soil test, once a year in February–March. Go up to 125 g per m² only if a soil test shows low potash.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrawberries:\u003c\/strong\u003e 60 g per m² with no soil test, once a year in March. Go up to 105 g per m² if a soil test shows low potash.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlanting a new fruit tree or bush:\u003c\/strong\u003e mix 35–70 g into the soil from the planting hole (roughly a 1 m² area), and mix it well so no granules touch the roots. Autumn planting is ideal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFruit in pots (lemons, figs, patio apples and plums)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFruit stays in the same compost for years, so use the lower end of the container rate. Scatter the granules on the compost surface and water in well.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLemons and other citrus:\u003c\/strong\u003e 2.5 g per litre of compost at potting (about 1 level tablespoon per 5 litres). Top up with 10–20 g per 10 litres of compost in spring (March–April) and midsummer (July) only. Keep using a citrus feed through the year; polyhalite doesn't replace it. Water with rainwater where possible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFigs:\u003c\/strong\u003e 2.5 g per litre at potting. Top up with 10 g per 10 litres in April and again in late May, then nothing after midsummer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatio apples and plums:\u003c\/strong\u003e 2.5 g per litre at potting. Top up with 10–20 g per 10 litres in spring and early summer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eYellowing between the veins on older leaves\u003c\/strong\u003e usually means magnesium is short. For a quick fix, use a magnesium-only feed such as Kieserite rather than more polyhalite.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow in chloride:\u003c\/strong\u003e polyhalite is a sulphate mineral with far less chloride than muriate of potash. That makes it a good potash choice for fruit that's sensitive to chloride, such as strawberries, raspberries, redcurrants and gooseberries. Citrus growing advice also says to avoid potash in its chloride form (muriate of potash).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt isn't lime, gypsum or Epsom salt.\u003c\/strong\u003e It always brings potash with it, so don't use it as a straight swap for any of them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt dissolves gradually\u003c\/strong\u003e, so water it in after spreading.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-step application\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssess your soil.\u003c\/strong\u003e Polyhalite is most useful where calcium, magnesium, potassium or sulphur are running low — typically containers, raised beds, sandy soils and intensively cropped patches.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure the rate.\u003c\/strong\u003e A level tablespoon of polyhalite is roughly 12–15g. Use the rates above as a starting point and adjust to crop demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply evenly.\u003c\/strong\u003e Scatter across the surface for containers. Broadcast by hand or spreader for beds. Mix thoroughly with compost for soil mixes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater in.\u003c\/strong\u003e Polyhalite needs soil moisture to begin dissolving and releasing nutrients. Water it in straight after application.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePair with a nitrogen source.\u003c\/strong\u003e Polyhalite carries no N or P. Use it with a Dr Forest blend or another NPK fertiliser for complete crop nutrition.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003ePolyhalite is the natural partner for any nitrogen-led feed. Pair with Dr Forest \u003cstrong\u003eAll Purpose 4-4-4\u003c\/strong\u003e for general gardens, the crop-specific blends (\u003cstrong\u003eTomato\u003c\/strong\u003e, \u003cstrong\u003eRose \u0026amp; Flower\u003c\/strong\u003e, \u003cstrong\u003ePotato\u003c\/strong\u003e) for targeted feeding, or \u003cstrong\u003eSeaweed Powder\u003c\/strong\u003e for biostimulant activity. The calcium content also pairs well with \u003cstrong\u003eSlow Release Humic Acid\u003c\/strong\u003e for long-term soil structure building.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 4 — FAQ ═══════════ --\u003e\n\u003cdiv id=\"drf-pl-panel4\" class=\"drf-panel\"\u003e\n\u003ch2\u003eFAQ about this polyhalite fertiliser\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq1\" class=\"drf-faq-q\"\u003eWhat is polyhalite fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThis product is Yorkshire-mined polyhalite fertiliser — one mineral, four nutrients (K, Ca, Mg, S) as sulphates, low chloride, dissolves gradually. Packed in Stockport. For the full definition (formation, mining, evidence), see \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-polyhalite\"\u003eWhat is polyhalite?\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq2\" class=\"drf-faq-q\"\u003eWhat is polyhalite used for?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003ePolyhalite is used as a base mineral fertiliser to supply potassium, calcium, magnesium and sulphur — the four nutrients most often stripped out of containers, raised beds and intensively cropped soil. Gardeners use it as a potash source low in chloride, for tomatoes and other chloride-sensitive crops, for lawns and turf, and for breaking up heavy clay. It carries no nitrogen or phosphorus, so it's paired with an NPK feed for complete nutrition.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq3\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq3\" class=\"drf-faq-q\"\u003eWhat crops benefit most from polyhalite?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eCrops with high calcium, potassium and sulphur demand respond most strongly. A 921-trial meta-analysis found the largest yield gains in potato, peanut, onion and oilseeds. In the garden that means potatoes, tomatoes, peppers, brassicas, onions and other alliums, and tree fruit. Chloride-sensitive crops — tomatoes, strawberries, potatoes and salad leaves — particularly benefit from potash delivered without chloride build-up in the root zone.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq4\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq4\" class=\"drf-faq-q\"\u003eWhere is polyhalite mined?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThis polyhalite is extracted from Boulby Mine on the North Yorkshire coast, over 1,200 metres beneath the North Sea. It is the world's only currently operating commercial polyhalite mine. A second major deposit — Woodsmith Mine, also in North Yorkshire — is under construction and expected to become the largest polyhalite mine in the world.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq5\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq5\" class=\"drf-faq-q\"\u003eIs polyhalite a potash fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — polyhalite is a type of potash fertiliser. \"Potash\" is the umbrella term for potassium fertilisers, and polyhalite is one of them: it supplies 14% K₂O as potassium sulphate, the same form as sulphate of potash (SOP), low in chloride. Where SOP gives you potash plus sulphur and nothing else, polyhalite gives you potash plus calcium, magnesium and sulphur in one product — so it covers more ground per application if your soil needs more than just potassium.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq6\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq6\" class=\"drf-faq-q\"\u003eHow is polyhalite different from sulphate of potash?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSulphate of potash (SOP) delivers 50% K₂O and 18% S — two nutrients. Polyhalite delivers 14% K₂O, 17% CaO, 6% MgO and 48% SO₃ — four nutrients. If your only need is concentrated potassium, SOP is the more concentrated source. If you need potassium \u003cem\u003eplus\u003c\/em\u003e calcium, magnesium and sulphur — as most garden soils do — polyhalite delivers all four in one product that dissolves gradually.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq7\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq7\" class=\"drf-faq-q\"\u003eIs polyhalite EU Organic Approved?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. Polyhalite is EU Organic Approved. It is a naturally mined crude salt with no chemical separation or industrial processing, only mechanical crushing and granulation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq8\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq8\" class=\"drf-faq-q\"\u003eIs polyhalite a complete fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. Polyhalite contains no nitrogen and no phosphorus. It supplies potassium, calcium, magnesium and sulphur only. For a complete feeding programme, combine it with a nitrogen and phosphorus source — a Dr Forest crop-specific blend, or an all-purpose NPK fertiliser.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq9\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq9\" class=\"drf-faq-q\"\u003eWill polyhalite change my soil pH?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. Unlike lime or dolomite, polyhalite delivers calcium and magnesium as sulphates, not carbonates. Sulphates are pH-neutral.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq10\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq10\" class=\"drf-faq-q\"\u003eCan polyhalite prevent blossom end rot?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eBlossom end rot is caused by calcium deficiency in the developing fruit — usually triggered by irregular watering rather than absent soil calcium. Polyhalite supplies 17% CaO in a form that dissolves gradually, holding a steady baseline of available calcium in the root zone. Combined with consistent watering, this significantly reduces the risk of blossom end rot in tomatoes, peppers, courgettes and aubergines.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq11\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq11\" class=\"drf-faq-q\"\u003eHow quickly does polyhalite work?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003ePolyhalite begins releasing nutrients as soon as it contacts soil moisture. University of Nottingham research showed 50–60% of sulphur is immediately plant-available, with the rest releasing gradually across the growing season. Expect visible effects within 2–4 weeks, with benefits continuing for months from a single application.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq12\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq12\" class=\"drf-faq-q\"\u003eIs this the same as Polysulphate?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003ePolysulphate is a branded trade name for polyhalite, marketed by the mining company that extracts it at Boulby. The mineral itself is the same — K₂Ca₂Mg(SO₄)₄·2H₂O. We sell polyhalite directly without commercial rebranding, so you know exactly what you're getting.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq-paa1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq-paa1\" class=\"drf-faq-q\"\u003eIs polyhalite a good fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eIt's a good base mineral, not a complete feed. One granule gives you 14% potash, 17% calcium oxide, 6% magnesium oxide and 48% sulphur trioxide, all as sulphates with virtually no chloride, and it dissolves gradually over the season. It has no nitrogen or phosphorus, so use it alongside an NPK feed. It earns its place in containers, raised beds and hard-cropped plots, and on chloride-sensitive crops such as tomatoes, strawberries and potatoes.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq-paa2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq-paa2\" class=\"drf-faq-q\"\u003eIs polyhalite better for the environment than other fertilisers?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eIt's mined, crushed and granulated, with no chemical refining, so the bag is the mineral as it came out of the ground rather than a chemically manufactured NPK. Because it dissolves gradually rather than all at once, less is lost to leaching than when you stack soluble sulphate of potash, gypsum and Epsom salt to get the same four nutrients. As with any fertiliser, stick to the rate: more than the plants can use helps nobody.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq-paa3\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-pl-faq-paa3\" class=\"drf-faq-q\"\u003eWhen should I apply polyhalite?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eIn beds and borders, at planting and then every 6–12 weeks from spring to autumn, at 50–125 g per m². In established pots, every 6–8 weeks through the growing season at 10–30 g per 10-litre pot. On lawns, two or three times a year (spring, summer and autumn) at 35–70 g per m². For clay soil, once a year in autumn or spring at 100–150 g per m². Water it in each time.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"1.5kg","offer_id":44704335790267,"sku":"DF-POLY-1.5","price":10.49,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":44704335823035,"sku":"DF-POLY-4","price":19.35,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":44704335855803,"sku":"DF-POLY-9","price":30.99,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":44740972576955,"sku":"DF-POLY-15","price":44.49,"currency_code":"GBP","in_stock":true},{"title":"30kg","offer_id":57119451447670,"sku":"DF-POLY-30","price":89.99,"currency_code":"GBP","in_stock":true},{"title":"60kg","offer_id":57814955852150,"sku":"DF-POLY-60","price":176.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/organic-granulated-polyhalite-fertiliser-mined-yorkshire-14-338.webp?v=1785512768"},{"product_id":"organic-seaweed-powder-concentrated-100-soluble-fertiliser-dr","title":"Seaweed Fertiliser | Soluble Plant Food Powder","description":"\u003c!-- Dr Forest — Seaweed Extract Powder — eBay listing HTML (Design System v1.0) --\u003e\n\u003c!-- Paste into: Sell Your Item → Description → HTML tab --\u003e\n\u003c!-- Prefix: sw   |   Layout: 4-tab   |   Source material: 100% soluble Ascophyllum nodosum WG --\u003e\n\u003cstyle\u003e\n@import url('https:\/\/fonts.googleapis.com\/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;1,400\u0026family=Jost:wght@400;500;600\u0026display=swap');\n\n.drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; 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font-weight: 600; }\n#drf-sw-tab1:checked ~ .drf-panels #drf-sw-panel1,\n#drf-sw-tab2:checked ~ .drf-panels #drf-sw-panel2,\n#drf-sw-tab3:checked ~ .drf-panels #drf-sw-panel3,\n#drf-sw-tab4:checked ~ .drf-panels #drf-sw-panel4 { display: block; }\n\n\/* ── CALLOUTS ── *\/\n.drf-callout { background: #E8F0EB; border-left: 2px solid #1B3D2F; padding: 1.1em 1.3em; margin: 1.4em 0; border-radius: 0; }\n.drf-callout-gold { background: #FAF7F0; border-left-color: #C5A55A; }\n.drf-callout p:last-child { margin-bottom: 0; }\n.drf-callout-title { font-size: 0.7em; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; color: #1B3D2F; margin-bottom: 0.5em; display: block; }\n.drf-callout-gold .drf-callout-title { color: #C5A55A; }\n.drf-callout-dark { background: #0F2A1F; border-left: 2px solid #C5A55A; padding: 1.1em 1.3em; margin: 1.4em 0; border-radius: 0; color: #F5F2EC; }\n.drf-callout-dark p { color: #F5F2EC; margin-bottom: 0; }\n.drf-callout-dark strong { color: #C5A55A; font-weight: 500; }\n.drf-callout-dark .drf-callout-title { color: #C5A55A; }\n\n\/* ── PULL QUOTE ── *\/\n.drf-pullquote { font-family: 'Cormorant Garamond', Georgia, serif; font-style: italic; font-weight: 400; font-size: 1.3em; color: #1B3D2F; text-align: center; line-height: 1.5; padding: 1.1em 1em; margin: 1.6em 0; border-top: 1px solid #C5A55A; border-bottom: 1px solid #C5A55A; }\n\n\/* ── MECHANISM CARDS ── *\/\n.drf-mech { border: 1px solid #D4CFC5; border-left: 2px solid #C5A55A; padding: 1.1em 1.3em; margin: 0.8em 0; border-radius: 0; background: #FFFFFF; }\n.drf-mech-num { font-family: 'Cormorant Garamond', Georgia, serif; font-size: 2em; font-weight: 400; color: #C5A55A; line-height: 1; }\n.drf-mech h4 { margin-top: 0.2em; color: #1B3D2F; text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 500; }\n.drf-mech p { font-size: 0.94em; color: #3A4A40; margin-bottom: 0; }\n\n\/* ── RATE CARDS ── *\/\n.drf-rate { border: 1px solid #D4CFC5; padding: 1.1em 1.3em; margin: 0.8em 0; border-radius: 0; background: #FFFFFF; }\n.drf-rate h4 { margin-top: 0; color: #1B3D2F; text-transform: none; letter-spacing: 0; font-size: 1.1em; font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 500; border-bottom: 1px solid #C5A55A; padding-bottom: 0.5em; margin-bottom: 0.6em; }\n.drf-rate-meta { font-size: 0.88em; color: #3A4A40; margin-bottom: 0.5em; }\n.drf-rate-meta strong { color: #C5A55A; font-weight: 500; }\n.drf-rate p { font-size: 0.94em; color: #3A4A40; margin-bottom: 0; }\n.drf-rate-cite { font-size: 0.78em; color: #3A4A40; font-style: italic; display: block; margin-top: 0.5em; }\n\n\/* ── STEPS ── *\/\n.drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n.drf-steps li { counter-increment: drf-step; padding: 0.9em 0 0.9em 3em; position: relative; border-bottom: 1px solid #D4CFC5; }\n.drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.9em; width: 2em; height: 2em; border-radius: 0; background: #1B3D2F; color: #F5F2EC; font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 400; font-size: 0.95em; display: flex; align-items: center; justify-content: center; }\n.drf-steps li:last-child { border-bottom: none; }\n\n\/* ── USE-CASE LIST ── *\/\n.drf-uses { list-style: none; padding: 0; }\n.drf-uses li { padding: 0.7em 0; border-bottom: 1px solid #C5A55A; }\n.drf-uses li:nth-child(even) { border-bottom-color: #1B3D2F; }\n.drf-uses li:last-child { border-bottom: none; }\n.drf-uses li strong { color: #1B3D2F; }\n\n\/* ── COMPARISON ── *\/\n.drf-compare { margin: 1.4em 0; }\n.drf-compare-box { border: 1px solid #D4CFC5; padding: 1.1em 1.3em; margin-bottom: 0.8em; border-radius: 0; background: #FFFFFF; }\n.drf-compare-box h4 { margin-top: 0; color: #1B3D2F; text-transform: none; letter-spacing: 0; font-size: 1.1em; font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 500; border-bottom: 1px solid #C5A55A; padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n\/* ── FAQ ── *\/\n.drf-faq { border-bottom: 1px solid #D4CFC5; }\n.drf-faq:last-child { border-bottom: none; }\n.drf-faq input[type=\"checkbox\"] { display: none; }\n.drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.9em 0; cursor: pointer; font-weight: 500; color: #1B3D2F; font-size: 0.98em; }\n.drf-faq-q::after { content: '+'; font-size: 1.2em; font-weight: 400; color: #C5A55A; width: 1.6em; height: 1.6em; border-radius: 0; background: #FFFFFF; border: 1px solid #C5A55A; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n.drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.94em; color: #3A4A40; line-height: 1.75; }\n.drf-faq-a \u003e div { padding: 0 0 1.1em; }\n.drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '\\2212'; background: #1B3D2F; color: #F5F2EC; border-color: #1B3D2F; }\n.drf-faq input:checked ~ .drf-faq-a { max-height: 700px; }\n\n\/* ── REFERENCES + RULE ── *\/\n.drf-refs { font-size: 0.8em; color: #3A4A40; line-height: 1.6; margin-top: 1.8em; padding-top: 1em; border-top: 1px solid #D4CFC5; }\n.drf-refs ol { padding-left: 1.4em; margin: 0; }\n.drf-refs li { margin-bottom: 0.35em; }\n.drf-sep { border: none; border-top: 1px solid #C5A55A; width: 200px; margin: 1.8em auto; }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-sw-tabset\" id=\"drf-sw-tab1\" checked\u003e\n  \u003cinput type=\"radio\" name=\"drf-sw-tabset\" id=\"drf-sw-tab2\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-sw-tabset\" id=\"drf-sw-tab3\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-sw-tabset\" id=\"drf-sw-tab4\"\u003e\n\n  \u003cdiv class=\"drf-tab-labels\"\u003e\n    \u003clabel for=\"drf-sw-tab1\"\u003eOverview\u003c\/label\u003e\n    \u003clabel for=\"drf-sw-tab2\"\u003eThe Science\u003c\/label\u003e\n    \u003clabel for=\"drf-sw-tab3\"\u003eHow to Use\u003c\/label\u003e\n    \u003clabel for=\"drf-sw-tab4\"\u003eFAQ\u003c\/label\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panels\"\u003e\n\n  \u003c!-- ═══════════ TAB 1 — OVERVIEW ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-sw-panel1\"\u003e\n\n    \u003cdiv class=\"drf-callout-dark\"\u003e\n      \u003cspan class=\"drf-callout-title\"\u003eGarden use only\u003c\/span\u003e\n      \u003cp\u003eThis is a \u003cstrong\u003egarden biostimulant for plants and soil\u003c\/strong\u003e. It is not a dietary supplement, not food grade, and not tested to supplement standards. Do not consume it. If you are looking for a seaweed or kelp supplement, this is the wrong product.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003ch2\u003eOrganic seaweed extract powder for plants — 100% soluble Ascophyllum nodosum, 19.38% alginic acid\u003c\/h2\u003e\n\u003cp class=\"drf-lead\"\u003eMix a spoon of this powder into water and you have a liquid seaweed feed — seaweed fertiliser and seaweed plant food as a drench or foliar, without buying a bottle of water.\u003c\/p\u003e\n\u003cp\u003eIt is a biostimulant, not a weekly high-nitrogen bottle. Nitrogen and phosphorus stay low; the useful fraction is alginic acid, natural growth compounds and potash from \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e. Use it to support roots, stress tolerance and how the plant uses the feed you already give — not as the only bag in the shed.\u003c\/p\u003e\n\n\n    \u003cdiv class=\"drf-badge-row\"\u003e\n      \u003cspan class=\"drf-badge\"\u003e100% Soluble\u003c\/span\u003e\n      \u003cspan class=\"drf-badge\"\u003e19.4% Alginic Acid\u003c\/span\u003e\n      \u003cspan class=\"drf-badge\"\u003e17.9% K₂O Potash\u003c\/span\u003e\n      \u003cspan class=\"drf-badge\"\u003eA. nodosum\u003c\/span\u003e\n      \u003cspan class=\"drf-badge\"\u003eFor Plants \u0026amp; Soil\u003c\/span\u003e\n      \u003cspan class=\"drf-badge\"\u003eGently Processed\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cp\u003eSeaweed is a biostimulant, not a conventional fertiliser. It carries almost no nitrogen or phosphorus. What it carries instead is alginic acid, complex polysaccharides, natural growth compounds and potash, all of which act on the plant's own growth and defence machinery rather than simply feeding it. That is the difference between a plant food and a plant activator.\u003c\/p\u003e\n\n    \u003cp\u003eThis is an organic seaweed extract powder made from a single ingredient, \u003cstrong\u003eAscophyllum nodosum\u003c\/strong\u003e, the knotted wrack of the cold North Atlantic and the most heavily researched seaweed in agricultural science. The seaweed is processed gently, without harsh chemicals or heat, so the bioactive fraction survives the manufacturing rather than being cooked or stripped out by hot alkaline extraction. The result dissolves fully in cold water in seconds, with no sediment, no straining and no blocked sprayer nozzles.\u003c\/p\u003e\n\n    \u003cp\u003eThe label is unusually strong for a soluble seaweed powder: \u003cstrong\u003e19.38% alginic acid\u003c\/strong\u003e, \u003cstrong\u003e48.33% organic matter\u003c\/strong\u003e and \u003cstrong\u003e17.89% K₂O\u003c\/strong\u003e. That potash figure matters. Most liquid seaweed feeds deliver a fraction of a percent of potassium once diluted, so gardeners assume seaweed is a poor source of potash. In a concentrated soluble powder it is not.\u003c\/p\u003e\n\n    \u003cdiv class=\"drf-stats\"\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e19.38%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eAlginic Acid\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e17.89%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eK₂O Potash\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e48.33%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eOrganic Matter\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e100%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eWater Soluble\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003ch3\u003eWhat gardeners use organic seaweed extract powder for\u003c\/h3\u003e\n    \u003cul class=\"drf-uses\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eRooting and transplant establishment\u003c\/strong\u003e — drenching the root zone at planting speeds root recovery after the disturbance of potting on or planting out\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStress recovery\u003c\/strong\u003e — betaines and mannitol act as osmoprotectants, stabilising cell membranes through drought, frost, heat and salinity\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePotash top-up for fruit and flowers\u003c\/strong\u003e — 17.89% K₂O supports sugar transport into fruit and firmer flower stems, alongside the biostimulant effect\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSoil biology\u003c\/strong\u003e — alginic acid and seaweed polysaccharides are a carbon source for beneficial soil bacteria and fungi\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSeed soaking\u003c\/strong\u003e — a dilute soak before sowing improves germination and produces seedlings with better root systems\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFoliar feeding\u003c\/strong\u003e — alginic acid lowers surface tension, so leaves wet properly and any nutrients in the tank mix are absorbed more readily\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDisease resilience\u003c\/strong\u003e — laminarin and fucoidan prime the plant's own defence pathways ahead of pathogen attack\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLawns and turf\u003c\/strong\u003e — deeper rooting and faster green-up after scarifying, aerating or overseeding\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch3\u003eSoluble powder or liquid seaweed?\u003c\/h3\u003e\n    \u003cdiv class=\"drf-compare\"\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eOrganic soluble seaweed extract powder\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eConcentrated, so you are not paying to ship water\u003c\/li\u003e\n          \u003cli\u003eDeclared label: 19.38% alginic acid, 17.89% K₂O, 48.33% organic matter\u003c\/li\u003e\n          \u003cli\u003eShelf life in years, kept dry and sealed\u003c\/li\u003e\n          \u003cli\u003eA small resealable pouch replaces a shelf of plastic bottles\u003c\/li\u003e\n          \u003cli\u003eDissolves completely in cold water, no sediment or nozzle blockage\u003c\/li\u003e\n          \u003cli\u003eYou set the dilution rate, from a gentle maintenance drench to a stress-recovery dose\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eLiquid seaweed feed\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eTypically 85 to 95% water by weight\u003c\/li\u003e\n          \u003cli\u003eAnalysis often given as a diluted NPK, so the true concentration is hard to compare\u003c\/li\u003e\n          \u003cli\u003eShorter shelf life once opened, sometimes preservative dependent\u003c\/li\u003e\n          \u003cli\u003eHeavy bottles, far more packaging per dose delivered\u003c\/li\u003e\n          \u003cli\u003eConvenient to pour, but you are locked into the maker's concentration\u003c\/li\u003e\n          \u003cli\u003eHigher shipping weight and emissions per dose\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003chr class=\"drf-sep\"\u003e\n\n    \u003cdiv class=\"drf-pullquote\"\u003eMade by Growers. Backed by Science.\u003c\/div\u003e\n\n    \u003cp\u003eDr Forest is a small independent fertiliser business run from Stockport, Greater Manchester, founded in 2020 and named after Joe's grandfather Dr Forrest, a GP in a Lancashire mining town who kept a back-garden plot for the runner beans he turned into piccalilli.\u003c\/p\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 2 — THE SCIENCE ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-sw-panel2\"\u003e\n\n    \u003ch2\u003eThe science of seaweed biostimulants: what Ascophyllum nodosum does to a plant\u003c\/h2\u003e\n\n    \u003ch3\u003eWhy this species and not any other seaweed\u003c\/h3\u003e\n    \u003cp\u003eAscophyllum nodosum grows in the intertidal zone of the North Atlantic and is exposed twice a day to desiccation, UV, freezing, osmotic shock and wave damage. Surviving that has driven it to accumulate an unusual density of protective compounds: alginates, fucoidans, laminarin, mannitol, betaines and phenolics. Applied to land plants, several of those compounds behave as signalling molecules rather than nutrients. This is the reason A. nodosum, rather than kelp or Sargassum, dominates the peer-reviewed biostimulant literature.\u003c\/p\u003e\n\n    \u003ch3\u003eAlginic acid is the number worth reading\u003c\/h3\u003e\n    \u003cp\u003eAlginic acid is the fraction that does most of the soil work. It is a natural chelator, binding mineral cations into forms roots can take up, and it improves aggregate stability and water-holding capacity in both sandy and heavy ground. It is also the reason a seaweed drench behaves as a soil conditioner as well as a feed. At \u003cstrong\u003e19.38%\u003c\/strong\u003e, this material sits above the alginic acid content typically declared by mainstream Ascophyllum powders, which is the single most useful comparison figure when you are looking at competing seaweed products.\u003c\/p\u003e\n\n    \u003ch3\u003eThe potash is real, and it is not chloride-heavy salt\u003c\/h3\u003e\n    \u003cp\u003eSeaweed accumulates potassium from seawater. At \u003cstrong\u003e17.89% K₂O\u003c\/strong\u003e, alongside 1.20% N and 0.89% P, this is a potash-dominant analysis. It will not replace a dedicated potash feed at garden dilution rates, but it does mean the biostimulant is doing nutritional work at the same time, which is why seaweed has always earned its place in flowering and fruiting programmes.\u003c\/p\u003e\n\n    \u003chr class=\"drf-sep\"\u003e\n\n    \u003ch3\u003eFive mechanisms of action\u003c\/h3\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n      \u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n      \u003ch4\u003eRoot growth and hormonal signalling\u003c\/h4\u003e\n      \u003cp\u003eAscophyllum nodosum extracts alter the plant's own hormone balance rather than simply supplying hormones. Wally et al. (2013) showed that treatment of Arabidopsis with a commercial A. nodosum extract changed cytokinin, auxin and abscisic acid biosynthesis and accumulation in plant tissue. The visible outcome is faster root establishment and a larger root surface for water and nutrient capture.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n      \u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n      \u003ch4\u003eDrought and abiotic stress tolerance\u003c\/h4\u003e\n      \u003cp\u003eShukla et al. (2018) demonstrated improved drought tolerance in soybean following A. nodosum application, through upregulation of stress-response genes rather than through any water-holding effect of the product itself. Betaines, mannitol and proline in the seaweed act as osmoprotectants, stabilising membranes while the plant's own stress response comes online.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n      \u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n      \u003ch4\u003eFrost and cold tolerance\u003c\/h4\u003e\n      \u003cp\u003eRayirath et al. (2009) found that lipophilic components of A. nodosum enhanced freezing tolerance in Arabidopsis. For a UK garden this is the most practically useful of all the stress findings, given how often a late frost is the difference between a crop and no crop on early potatoes, blossom and tender bedding.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n      \u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n      \u003ch4\u003eInduced defence\u003c\/h4\u003e\n      \u003cp\u003eLaminarin and fucoidan, polysaccharides specific to brown algae, act as elicitors that trigger systemic acquired resistance. The plant's defence genes are primed before infection, so the response to a fungal or bacterial attack is faster and stronger. Khan et al. (2009) review the elicitor evidence across crops.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n      \u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n      \u003ch4\u003eChelation, wetting and soil biology\u003c\/h4\u003e\n      \u003cp\u003eAlginic acid chelates mineral cations in soil and lowers surface tension on the leaf, which is why tank-mixing seaweed with a foliar feed reliably improves the performance of the feed. In the soil, the polysaccharide fraction feeds bacteria and fungi and improves aggregate stability. Shukla et al. (2019) summarise the soil and rhizosphere evidence.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003chr class=\"drf-sep\"\u003e\n\n    \u003ch3\u003eMore is not better: the dose curve reverses\u003c\/h3\u003e\n    \u003cp\u003eSeaweed biostimulant responses are concentration dependent and non-linear. The effect rises to an optimum and then falls away, and strong concentrations can inhibit the growth they promote at the correct dilution. Khan et al. (2009) note this concentration dependence across the biostimulant literature. Doubling the rate does not double the result, it usually costs you the result. Weigh the powder rather than guessing with a spoon, and treat the stress-recovery rate as a short-term measure, not a new normal.\u003c\/p\u003e\n\n    \u003cdiv class=\"drf-refs\"\u003e\n      \u003ch4\u003eScientific references\u003c\/h4\u003e\n      \u003col\u003e\n        \u003cli\u003eKhan, W. et al. (2009). Seaweed extracts as biostimulants of plant growth and development. \u003cem\u003eJournal of Plant Growth Regulation\u003c\/em\u003e, 28, 386–399.\u003c\/li\u003e\n        \u003cli\u003eRayirath, P. et al. (2009). Lipophilic components of the brown seaweed \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e enhance freezing tolerance in \u003cem\u003eArabidopsis thaliana\u003c\/em\u003e. \u003cem\u003ePlanta\u003c\/em\u003e, 230(1), 135–147.\u003c\/li\u003e\n        \u003cli\u003eWally, O.S.D. et al. (2013). Regulation of phytohormone biosynthesis and accumulation in \u003cem\u003eArabidopsis\u003c\/em\u003e following treatment with commercial extract from the marine macroalga \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e. \u003cem\u003eJournal of Plant Growth Regulation\u003c\/em\u003e, 32, 324–339.\u003c\/li\u003e\n        \u003cli\u003eShukla, P.S. et al. (2018). Seaweed extract improves drought tolerance of soybean by regulating stress-response genes. \u003cem\u003eAoB Plants\u003c\/em\u003e, 10(1), plx051.\u003c\/li\u003e\n        \u003cli\u003eShukla, P.S. et al. (2019). \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e-based biostimulants: sustainable applications in agriculture for the stimulation of plant growth, stress tolerance and disease management. \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e, 10, 655.\u003c\/li\u003e\n        \u003cli\u003eZamarreño, A.M. et al. (2024). Plant growth-promoting effect of an \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e extract. \u003cem\u003eChemical and Biological Technologies in Agriculture\u003c\/em\u003e, 11, 190.\u003c\/li\u003e\n      \u003c\/ol\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-sw-panel3\"\u003e\n\n    \u003ch2\u003eHow to use organic seaweed extract powder: rates, mixing and timing\u003c\/h2\u003e\n\n    \u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n      \u003cspan class=\"drf-callout-title\"\u003eDissolves in cold water, no soaking needed\u003c\/span\u003e\n      \u003cp\u003eThis is a fully soluble powder, not a meal or a granule. Sprinkle the measured amount onto the water surface, stir briefly, and it is gone within seconds with no sediment. The powder is alkaline, so in hard tap water expect a slight cloudiness on standing. That is normal and does not affect performance. Use the made-up solution within 24 hours.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003ch3\u003eApplication rates\u003c\/h3\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eSoil drench, general maintenance\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 1.2 to 1.5 litres  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks\u003c\/div\u003e\n      \u003cp\u003eThe standard biostimulant rate for anything in the ground or in a pot through the growing season. Apply around the root zone and water in. Compatible with all Dr Forest fertilisers.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eFoliar spray\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 1.5 to 2 litres  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks\u003c\/div\u003e\n      \u003cp\u003eBoth leaf surfaces, fine mist, early morning or evening. Never in full sun. The alginic acid acts as a wetting agent, so you need less spray volume than you think to get full coverage.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eTransplanting and potting on\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 1.2 litres  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once at planting, repeat after 7 days\u003c\/div\u003e\n      \u003cp\u003eDrench the root zone straight after any root disturbance. This is the single highest-value application in the year.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eSeed soak\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 2 litres  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e 4 to 12 hours before sowing\u003c\/div\u003e\n      \u003cp\u003eDrain and sow directly. Do not rinse. Improves germination and produces seedlings with stronger root systems.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eStress recovery\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 1 litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly for 2 to 3 weeks\u003c\/div\u003e\n      \u003cp\u003eFrost damage, heat, drought or pest attack. Drop back to the standard rate as soon as the plant is growing away again. This is a short-term rate, not a permanent one.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eLawn and turf\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1g per 1.2 litres, applied at 1 litre per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Monthly\u003c\/div\u003e\n      \u003cp\u003eDeeper rooting, better drought tolerance, faster green-up. Most useful straight after scarifying, aerating or overseeding.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-rate\"\u003e\n      \u003ch4\u003eFertigation and drip\u003c\/h4\u003e\n      \u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 0.5 to 1g per 2 litres  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 1 to 2 weeks\u003c\/div\u003e\n      \u003cp\u003eAdd to the reservoir after the main nutrients are mixed. Fully soluble, so no filter or emitter issues, and the contribution to EC is small.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-callout-dark\"\u003e\n      \u003cspan class=\"drf-callout-title\"\u003eDo not increase the rate\u003c\/span\u003e\n      \u003cp\u003eSeaweed biostimulant response is \u003cstrong\u003enon-linear\u003c\/strong\u003e. Past the optimum the effect reverses and strong concentrations inhibit growth instead of promoting it. A stronger mix is not a stronger result. Weigh the powder, do not eyeball it, and if you have overdone it, water through with plain water and go back to the standard rate.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n\u003ch3\u003eOn fruit trees and soft fruit\u003c\/h3\u003e\n\u003cp\u003eAt these rates seaweed is a supplement, not a main feed, so keep feeding as normal alongside it. On fruit it's most useful at planting and on strawberries.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAt planting\u003c\/strong\u003e (trees, bushes, canes, strawberry runners): dissolve 1 g in 1.2 litres of water and drench the root zone straight after planting. Repeat after 7 days. A newly planted tree takes 5–10 litres of the solution; a bush or cane 2–3 litres.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrawberries\u003c\/strong\u003e (ground or pots): drench at 1 g per 1.2–1.5 litres every 2–4 weeks, from new spring growth to the end of picking. You can also spray the leaves at 1 g per 1.5–2 litres, in the evening or on a dull day.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEstablished trees and bushes:\u003c\/strong\u003e optional. A drench in spring and another after a hot, dry spell is plenty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasuring:\u003c\/strong\u003e 1 g is about half a level teaspoon. Mix it into a little warm water first, then top up.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHonest expectations:\u003c\/strong\u003e in field trials on strawberries in Victoria, Australia, a liquid extract of two seaweeds, given as a monthly drench (with a leaf spray as well in one study), gave better root growth and about 8–10% more fruit. Both studies were funded by the extract's maker (one jointly with a university), and that extract isn't this powder, so don't expect the same figures. Results vary with soil, weather and variety.\u003c\/p\u003e\n    \u003ch3\u003eMixing, step by step\u003c\/h3\u003e\n    \u003col class=\"drf-steps\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWeigh the powder.\u003c\/strong\u003e 1g is roughly half a level teaspoon, but density varies. For a 10-litre can at the standard drench rate, that is 7 to 8g. Kitchen scales are worth the thirty seconds.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdd powder to water, not water to powder.\u003c\/strong\u003e Sprinkle onto the surface and stir. It dissolves within seconds, with no clumps and nothing to strain out.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdd other feeds after the seaweed has dissolved.\u003c\/strong\u003e Seaweed goes in first, concentrated fertilisers second, then top up to volume.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eApply within 24 hours.\u003c\/strong\u003e Root drenches at the base, foliar sprays to both leaf surfaces in the cool part of the day.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eReseal and store dry.\u003c\/strong\u003e Kept sealed in a cool dry place the powder lasts for years. Moisture is the only thing that will spoil it.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\n    \u003ch3\u003eFive common mistakes\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTreating it as a fertiliser.\u003c\/strong\u003e It is a biostimulant with useful potash. It still needs a balanced feed alongside it, not instead of it.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDoubling the rate for a struggling plant.\u003c\/strong\u003e The curve reverses. Use the stress-recovery rate, not a rate you invented.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eSpraying in full sun.\u003c\/strong\u003e Scorch risk and rapid evaporation before anything is absorbed. Early morning or evening only.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMixing a batch and leaving it a week.\u003c\/strong\u003e Make it up fresh and use it within 24 hours.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eApplying only when something has gone wrong.\u003c\/strong\u003e The best returns come from fortnightly applications through the season, particularly at transplanting and at the start of flowering.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003cdiv class=\"drf-callout\"\u003e\n      \u003cspan class=\"drf-callout-title\"\u003eWorks well alongside\u003c\/span\u003e\n      \u003cp\u003ePair with \u003cstrong\u003eFulvic Acid Powder\u003c\/strong\u003e for mineral chelation and uptake, \u003cstrong\u003eHumic Acid Granules\u003c\/strong\u003e for long-term soil CEC, and the Dr Forest crop-specific plant foods for tomatoes, chillies, strawberries and roses, where the seaweed acts as the biostimulant layer under the nutrition.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════ TAB 4 — FAQ ═══════════ --\u003e\n  \u003cdiv class=\"drf-panel\" id=\"drf-sw-panel4\"\u003e\n\n    \u003ch2\u003eSeaweed feed vs NPK fertiliser\u003c\/h2\u003e\n\u003cp\u003eGardeners often search seaweed feed and seaweed plant food expecting an NPK replacement. Seaweed extract is the wrong tool for that job. A proper tomato or all-purpose fertiliser supplies the numbers; seaweed sits alongside them. For the longer explanation of forms, rates and evidence, see \u003ca href=\"\/blogs\/the-dr-forest-blog\/seaweed-fertiliser-guide\"\u003ewhat seaweed fertiliser actually does\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eChoosing meal vs powder? Start at the \u003ca href=\"\/collections\/seaweed-fertiliser\"\u003eseaweed fertiliser\u003c\/a\u003e collection.\u003c\/p\u003e\n\n\u003ch2\u003eOrganic seaweed extract powder: frequently asked questions\u003c\/h2\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq1\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq1\"\u003eCan I take this as a seaweed or kelp supplement?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNo. This is a garden biostimulant for plants and soil. It is not food grade, it is not manufactured to supplement standards, and it has not been tested to the heavy metal and contaminant limits that apply to products intended for human consumption. Do not consume it. If you want a seaweed or kelp supplement, buy one from a supplement supplier who can show you that testing.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq13\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq13\"\u003eIs this organic seaweed fertiliser, and can I use it in an organic garden?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt is a single-ingredient organic seaweed product. Dried \u003cem\u003eAscophyllum nodosum\u003c\/em\u003e, processed gently without harsh chemicals or heat, with nothing synthetic added and no fillers, carriers or preservatives. Nothing goes into the bag except the seaweed. That is why it suits organic and no-dig growing, and it is what most gardeners mean when they search for organic seaweed fertiliser. We do not sell it as certified organic and we make no certification claim. If you grow under a certification scheme yourself, check with your certifier before adding any input to your programme.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq2\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq2\"\u003eIs seaweed feed high in nitrogen?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNo, and this is the most common misunderstanding about seaweed. The analysis here is 1.20% N, 0.89% P and 17.89% K₂O. Seaweed is potash dominant with very little nitrogen. If your plants are pale and hungry, they need a nitrogen source, not more seaweed. Use seaweed for rooting, stress tolerance and the potash contribution, and feed nitrogen separately.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq3\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq3\"\u003eWhat is the NPK of seaweed fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eFor this soluble seaweed extract powder, 1.20 – 0.89 – 17.89 on the label, expressed as N, P and K₂O. Liquid seaweed feeds usually declare something like 0.1 – 0.0 – 0.6 because they are mostly water, which is why comparing a powder to a liquid on NPK alone is misleading. Compare the concentrate, or compare what actually reaches the plant per pound spent.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq4\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq4\"\u003eIs seaweed fertiliser high in potash?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIn concentrated powder form, yes. 17.89% K₂O is a genuinely potash-rich analysis. At garden dilution rates it will not replace a dedicated potash feed for a heavy-cropping tomato or a mature rose, but it does mean you are getting nutritional value alongside the biostimulant effect rather than the biostimulant effect alone.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq5\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq5\"\u003eIs seaweed fertiliser acidic or alkaline?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThis powder is alkaline, with a pH close to 10 as supplied. At garden dilution rates the effect on soil or growing-medium pH is negligible, because the amount of powder in a full watering can is a gram or two. If you are dosing a small volume of low-buffer solution and monitoring pH closely, add the seaweed first and check the pH afterwards rather than before.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq6\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq6\"\u003eHow often should I use seaweed fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eEvery two weeks through the growing season, as either a drench or a foliar spray. The effects are cumulative, so a regular fortnightly routine beats an occasional heavy dose. Add an extra application at transplanting and at the start of flowering, and switch to the weekly stress-recovery rate for two or three weeks after frost, drought or pest damage.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq7\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq7\"\u003eIs this the same as kelp meal or seaweed meal?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNo. Kelp meal and seaweed meal are coarsely ground dried seaweed that has to break down in the soil over weeks before anything becomes available, and they will not go through a sprayer. This is a soluble extract powder that dissolves in cold water in seconds and can be used as a foliar spray, a drench, a seed soak or through fertigation on the same day you open the bag.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq8\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq8\"\u003eWhy powder rather than liquid seaweed?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eLiquid seaweed is typically 85 to 95% water. You pay for that water, the bottle it sits in and the weight of shipping it. A soluble powder gives you a declared concentrate analysis, a shelf life measured in years rather than months, a fraction of the packaging per dose, and the freedom to set your own dilution rate for maintenance or stress recovery.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq9\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq9\"\u003eCan I mix it with other fertilisers?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes, and it is better that way. Seaweed extract is compatible with all Dr Forest fertilisers. Alginic acid improves the uptake of whatever else is in the tank, so combining is more effective than applying separately. Dissolve the seaweed first, then add the concentrates.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq10\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq10\"\u003eHow quickly will I see a difference?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eHormonal and gene-expression changes begin within days, but they are invisible. What you actually see is better colour and stronger growth after one to three weeks of fortnightly applications, and much more obviously, faster recovery from transplant shock or a cold snap compared with untreated plants alongside.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq11\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq11\"\u003eWhich plants can I use it on?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eAll garden plants. Vegetables, fruit, herbs, tomatoes and chillies, roses and flowering ornamentals, trees, shrubs, lawns, containers and raised beds. The mechanisms involved are basic plant processes, so nothing is off limits and there is no withholding period on edible crops.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-faq\"\u003e\n      \u003cinput type=\"checkbox\" id=\"drf-sw-faq12\"\u003e\n      \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-sw-faq12\"\u003eIs it safe around children, pets and bees?\u003c\/label\u003e\u003c\/h3\u003e\n      \u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt is dried seaweed with nothing synthetic added, and at garden dilution rates it presents no hazard to pets, wildlife or pollinators. It is not a pesticide and has no insecticidal action. Store it sealed and out of reach as you would any garden product, keep the dust out of eyes when weighing, and do not let anyone eat it.\u003c\/div\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-sw-faq-paa1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-sw-faq-paa1\" class=\"drf-faq-q\"\u003eWhat is seaweed fertiliser good for?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eMainly as a biostimulant rather than a main feed. Gardeners use it to help plants re-root after potting on or planting out, to recover from frost, heat or drought, to soak seeds before sowing, and as a foliar spray, because alginic acid helps the spray wet the leaf. It also feeds soil life and helps soil crumb. At 1.20-0.89-17.89 it's potash-led and low in nitrogen, so keep using your normal fertiliser alongside it.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-sw-faq-paa2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-sw-faq-paa2\" class=\"drf-faq-q\"\u003eHow do I use seaweed powder?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eDissolve it in water and either water it on or spray it. As a root drench, use 1 g per 1.2–1.5 litres every 2 weeks. As a foliar spray, use 1 g per 1.5–2 litres every 2 weeks, misting both leaf surfaces in early morning or evening and never in full sun. After transplanting, use 1 g per 1.2 litres and repeat after 7 days. For a seed soak, use 1 g per 2 litres for 4–12 hours. For stress recovery, use 1 g per litre weekly for 2–3 weeks. Use the mix within 24 hours.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\n  \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"40g","offer_id":45766316261563,"sku":"DF-SEAWEEDPWD-40G","price":6.5,"currency_code":"GBP","in_stock":false},{"title":"120g","offer_id":45766316294331,"sku":"DF-SEAWEEDPWD-120G","price":9.99,"currency_code":"GBP","in_stock":true},{"title":"250g","offer_id":45766316327099,"sku":"DF-SEAWEEDPWD-250G","price":14.99,"currency_code":"GBP","in_stock":true},{"title":"500g","offer_id":55714805416310,"sku":"DF-SEAWEEDPWD-500G","price":25.0,"currency_code":"GBP","in_stock":true},{"title":"1kg","offer_id":55714809479542,"sku":"DF-SEAWEEDPWD-1","price":48.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/organic-seaweed-powder-fertiliser-brown-resealable-pouch-dr-forest-116.webp?v=1785512767"},{"product_id":"fulvic-acid","title":"Fulvic Acid Powder for Plants | 70% Fulvic Biostimulant","description":"\u003c!-- Dr Forest — Fulvic Acid Powder Product Page (v1.0 Design System \/ v2 skill) --\u003e\u003c!-- Prefix: drf-fa- (fulvic acid) --\u003e\u003c!-- Structured data: the theme emits Product schema; FAQPage comes from the seo.faq_schema metafield (schema audit 2026-09-02) --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- 4-tab pure CSS layout. No JavaScript. 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border-top: 1px solid var(--drf-gold); border-bottom: 1px solid var(--drf-gold); max-width: 90%; }\n\n  \/* FAQ — square +\/- with gold border *\/\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.9em 0; cursor: pointer; font-weight: 500; color: var(--drf-grn-dark); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.25em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; background: var(--drf-white); border: 1px solid var(--drf-gold); display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; font-size: 0.92em; color: var(--drf-muted); line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '−'; background: var(--drf-grn-dark); color: var(--drf-cream); border-color: var(--drf-grn-dark); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 700px; }\n\n  \/* References *\/\n  .drf-refs { font-size: 0.78em; color: var(--drf-muted); line-height: 1.55; margin-top: 1.6em; padding-top: 1em; border-top: 1px solid var(--drf-border); }\n  .drf-refs h4 { color: var(--drf-grn-dark); margin-bottom: 0.5em; }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.35em; }\n\n  \/* Hairline rule — v1.0: 200px, centred, gold *\/\n  .drf-sep { border: none; border-top: 1px solid var(--drf-gold); margin: 1.6em auto; width: 200px; }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput checked id=\"drf-fa-tab1\" name=\"drf-fa-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-fa-tab2\" name=\"drf-fa-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-fa-tab3\" name=\"drf-fa-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-fa-tab4\" name=\"drf-fa-tabset\" type=\"radio\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-fa-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-fa-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-fa-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-fa-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═══════════════ TAB 1: OVERVIEW ═══════════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-fa-panel1\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eFulvic acid powder · 70% · garden chelator\u003c\/span\u003e\n\u003ch2\u003eYou fed it. It still looks hungry\u003c\/h2\u003e\n\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge\"\u003e70% Fulvic Acid\u003c\/span\u003e \u003cspan class=\"drf-badge\"\u003e99% Cold-Water Soluble\u003c\/span\u003e \u003cspan class=\"drf-badge\"\u003eEnzymatic Process\u003c\/span\u003e \u003cspan class=\"drf-badge\"\u003eOrganic Certified\u003c\/span\u003e \u003cspan class=\"drf-badge\"\u003eNatural Chelator\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp\u003ePale new leaves, a faint mottle between the veins, and half a bag of fertiliser on the shelf that should have sorted it. Before you buy another feed, check the watering and the pH. Quite often the nutrients are already in the pot. They are just not in a form the root can take up — tied up in alkaline compost, or grabbed by the calcium in hard tap water on the way in.\u003c\/p\u003e\n\n\u003cp\u003eFertiliser is the meal. Fulvic is the fork. This is a \u003cstrong\u003e70% fulvic acid\u003c\/strong\u003e powder, the small, water-soluble end of the humus family. Its carboxyl and hydroxyl groups hold trace metals — iron, zinc, manganese, copper — in mobile complexes that move with water into root and leaf. That is the whole job: it carries what is already there. It is not an NPK feed, which is why it goes beside a fertiliser and never instead of one.\u003c\/p\u003e\n\n\u003cp\u003eHumic products have earned their muddy name. Raw humate tea browns the tank, settles out and blocks a fine nozzle. Fulvic is the fraction that stays dissolved: \u003cstrong\u003e99% soluble in cold water\u003c\/strong\u003e, made by enzymatic hydrolysis rather than hot alkali, so it goes through a sprayer, a drench can or a drip line clean.\u003c\/p\u003e\n\n\u003cp\u003eLess is the point. Most foliar work sits around 0.8 g per litre, and in the most-cited tomato trial doubling the rate cost the plants their gain. At that rate a 60 g pack makes about 75 litres of spray, so weigh it rather than heap it. Use rainwater where you can; hard tap spends the chelation on its own calcium before the spray reaches a leaf.\u003c\/p\u003e\n\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e70%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eFulvic acid\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e99%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCold-water soluble\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e0.5–1 g\/L\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eFoliar rate\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eOrganic\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCertified\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eDose and mixing: dissolve first\u003c\/span\u003e\u003cp\u003e\u003cstrong\u003eFoliar:\u003c\/strong\u003e 0.5 to 1 g per litre, every 2 to 4 weeks while plants are growing. In the best-known tomato trial, 0.8 g per litre did best and double that did worse.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoil drench:\u003c\/strong\u003e 0.5 to 1 g per litre, watered on at about 5 litres per m². Stop at 5 g per m² for the whole season. Pots: one drench at 0.5 g per litre.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolve first.\u003c\/strong\u003e Weigh the powder, then shake each gram in about 30 ml of warm (not hot) water for 30 to 60 seconds, in a jar, not the sprayer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThen dilute.\u003c\/strong\u003e Pour it into the sprayer or can and top up to the full volume.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThen spray or drench.\u003c\/strong\u003e Never tip dry powder straight into the sprayer.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eStart at the low end.\u003c\/strong\u003e Past a narrow window, more does less, so weigh it rather than heap it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eWhat this powder is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA fed plant that still looks deficient\u003c\/strong\u003e — fulvic moves the traces already in the pot. If a trace really is missing, add it; fulvic will not invent iron that is not there. And do not stack three tonics in one week because the leaves are still pale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA spray tank that stays clean\u003c\/strong\u003e — foliar, drench or fertigation without sediment. Pre-dissolve a gram in a splash of warm water, top up, and add it to the tank last.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStressed plants and tired, low-organic soils\u003c\/strong\u003e — that is where published gains are biggest. On a well-fed bed in good heart, expect a quieter result.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eGarden use only — not a human supplement\u003c\/span\u003e\n\u003cp\u003e“Fulvic” on a marketplace can mean a detox drink, lignite dust or a paper-mill by-product, and testing has found plenty of products sold under the name with no fulvic fraction in them at all. This pack is a garden biostimulant for plants and soil, with its strength and solubility on the label. It is not formulated, tested or approved for people.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eFulvic powder vs humic flakes vs slow-release granules\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThis powder\u003c\/strong\u003e — the small, soluble fraction; carries traces into leaf and root; foliar, drench, fertigation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/products\/humic-acid\"\u003eHumic Acid Flakes\u003c\/a\u003e\u003c\/strong\u003e — the soluble humic half for the root zone; holds nutrients in the soil rather than carrying them into the leaf. A watering-can job, not a fine foliar nozzle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/products\/slow-release-humic-acid\"\u003eSlow-Release Humic Granules\u003c\/a\u003e\u003c\/strong\u003e — insoluble, worked into beds for a slow soil build over the season. Different job again.\u003c\/p\u003e\n\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well with…\u003c\/span\u003e\n\u003cp\u003e\u003ca href=\"\/products\/humic-fulvic-acid-pair\"\u003eHumic \u0026amp; Fulvic Acid Pair\u003c\/a\u003e — humic holds, fulvic carries; two packs, each at its own rate.\u003cbr\u003e\n\u003ca href=\"\/products\/organic-liquid-micronutrients\"\u003eLiquid Micronutrients\u003c\/a\u003e — when the traces really are short, not just stuck.\u003cbr\u003e\n\u003ca href=\"\/products\/organic-all-purpose-fertiliser-4-4-4\"\u003eAll Purpose 4-4-4\u003c\/a\u003e — the meal the fork needs; fulvic adds no NPK of its own.\u003cbr\u003e\n\u003ca href=\"\/products\/liquid-seaweed-brix\"\u003eBrix+ Liquid Seaweed\u003c\/a\u003e or \u003ca href=\"\/products\/liquid-amino-acids\"\u003eLiquid Amino Acids\u003c\/a\u003e — both tank-mix with it; dissolve the fulvic first.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eHonest limits\u003c\/span\u003e\n\u003cp\u003eNot a human supplement. Not an NPK feed — pair it with a fertiliser. More is worse past a narrow window, so start low. It will not fix waterlogged roots, a pH problem or a hungry soil that needs compost and mulch. The trials on our guides tested other fulvic products, not this pack. Hard water dulls it. Mix fresh and use within 24 hours; keep the powder sealed, as it pulls in damp and clumps. For what fulvic acid is and the evidence behind it, see \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-fulvic-acid\"\u003eWhat is fulvic acid?\u003c\/a\u003e, and for crop rates \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-apply-fulvic-acid\"\u003eHow to apply fulvic acid\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003ePacked in Stockport by Dr Forest — named after Joe’s grandfather, Dr Forrest, a GP who kept a back-garden plot for the runner beans he turned into piccalilli.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-fa-panel2\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eThe Science\u003c\/span\u003e\n\u003ch2\u003eSKU science: chelation, solubility and dose\u003c\/h2\u003e\n\u003cp\u003eThis powder is the low-molecular fulvic fraction: small enough to stay soluble at working rates and to move with water into leaf and root. Carboxyl and hydroxyl groups bind metal cations (iron, zinc, manganese, copper, boron) into mobile complexes — that is the chelation job on the label.\u003c\/p\u003e\n\u003cp\u003eDose is not “more is better”. Fulvic shows a narrow, non-linear window; published tomato work often peaks near \u003cstrong\u003e0.8 g\/L\u003c\/strong\u003e foliar, with higher rates reversing the gain. Start low, step up only if a few applications have already run at the low end.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eThis powder\u003c\/th\u003e\n\u003cth\u003eWhy it matters\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFulvic content\u003c\/td\u003e\n\u003ctd\u003e70% by mass\u003c\/td\u003e\n\u003ctd\u003eConcentrated active fraction in the jar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolubility\u003c\/td\u003e\n\u003ctd\u003e99% cold water\u003c\/td\u003e\n\u003ctd\u003eClean foliar \/ fertigation mixes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtraction\u003c\/td\u003e\n\u003ctd\u003eEnzymatic, ambient\u003c\/td\u003e\n\u003ctd\u003eGentler than harsh alkaline heat processes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrganic status\u003c\/td\u003e\n\u003ctd\u003eOrganic certified\u003c\/td\u003e\n\u003ctd\u003eOrganic certified input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eFull evidence guide\u003c\/span\u003e\n\u003cp\u003eMechanisms, hormesis and the meta-analysis numbers are covered in \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-fulvic-acid\"\u003eWhat is fulvic acid? The evidence, not the hype\u003c\/a\u003e — this tab stays SKU-short on purpose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-fa-panel3\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eHow to Use\u003c\/span\u003e\n\u003ch2\u003ePack rates for this powder\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eUse rainwater where you can\u003c\/span\u003e\n\u003cp\u003eHard UK tap water binds calcium and magnesium to fulvic before it reaches the leaf. Prefer rainwater; if you only have hard tap, stand 24 hours or lightly pre-acidify. Mix fresh and use within 24 hours.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eMixing\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeigh it.\u003c\/strong\u003e Rates are grams per litre. A level teaspoon is roughly 2.5 g, close enough for rough work but not for the narrow dose window.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDissolve first.\u003c\/strong\u003e Shake each gram in about 30 ml of warm (not hot) water for 30 to 60 seconds, in a jar, not the sprayer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFill the sprayer or can.\u003c\/strong\u003e Rainwater if you can. If you are feeding at the same time, make up the diluted feed in it first.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdd the dissolved fulvic last\u003c\/strong\u003e and top up to the full volume for your rate, 0.5 to 1 g per litre. It is a carrier, not a feed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpray or drench the same day.\u003c\/strong\u003e Use within 24 hours.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eStarter pack rates\u003c\/span\u003e\n\u003cp\u003e\u003cstrong\u003eFoliar:\u003c\/strong\u003e 0.5–1 g\/L (many crops sit near 0.8 g\/L).\u003cbr\u003e\n\u003cstrong\u003eSoil drench:\u003c\/strong\u003e 0.5–1 g\/L.\u003cbr\u003e\n\u003cstrong\u003eSeed sprouting:\u003c\/strong\u003e 80 mg per litre (0.08 g), on kitchen paper kept damp with the solution until the seeds sprout, as in the Zhang 2021 tomato trial. Far weaker than a spray.\u003c\/p\u003e\n\u003cp\u003eStart at the low end. Going past the optimum can reverse the effect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHow far a pack goes\u003c\/h3\u003e\n\u003cp\u003eWorked at 0.8 g per litre, the rate the tomato trial favoured, with the full 0.5 to 1 g range alongside.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003cth\u003eLitres at 0.8 g\/L\u003c\/th\u003e\n\u003cth\u003eLitres at 0.5 to 1 g\/L\u003c\/th\u003e\n\u003cth\u003eCost per litre at 0.8 g\/L\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e60 g\u003c\/td\u003e\n\u003ctd\u003e75 L\u003c\/td\u003e\n\u003ctd\u003e60 to 120 L\u003c\/td\u003e\n\u003ctd\u003eabout 8.7p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e120 g\u003c\/td\u003e\n\u003ctd\u003e150 L\u003c\/td\u003e\n\u003ctd\u003e120 to 240 L\u003c\/td\u003e\n\u003ctd\u003eabout 5.3p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e250 g\u003c\/td\u003e\n\u003ctd\u003eabout 312 L\u003c\/td\u003e\n\u003ctd\u003e250 to 500 L\u003c\/td\u003e\n\u003ctd\u003eabout 4.2p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e500 g\u003c\/td\u003e\n\u003ctd\u003e625 L\u003c\/td\u003e\n\u003ctd\u003e500 to 1,000 L\u003c\/td\u003e\n\u003ctd\u003eabout 3.2p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1 kg\u003c\/td\u003e\n\u003ctd\u003e1,250 L\u003c\/td\u003e\n\u003ctd\u003e1,000 to 2,000 L\u003c\/td\u003e\n\u003ctd\u003e2.8p\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eCost per litre worked from October 2026 prices.\u003c\/p\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eFull rates by crop\u003c\/span\u003e\n\u003cp\u003eCrop-by-crop tables, trial citations, hormesis notes and common mistakes: \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-apply-fulvic-acid\"\u003eHow to apply fulvic acid: rates and method\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003ePairs well with\u003c\/span\u003e\n\u003cp\u003e\u003ca href=\"\/products\/humic-acid\"\u003eHumic acid flakes\u003c\/a\u003e for the soil-side job; or the \u003ca href=\"\/products\/humic-fulvic-acid-pair\"\u003ehumic \u0026amp; fulvic pair\u003c\/a\u003e. Not sure which molecule you need? \u003ca href=\"\/blogs\/the-dr-forest-blog\/humic-vs-fulvic-acid\"\u003eHumic vs fulvic: which you need\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-fa-panel4\"\u003e\n\u003ch2\u003eFAQ about this fulvic powder\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq-supp\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq-supp\"\u003eCan I take this as a fulvic acid supplement?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. This is a garden biostimulant for plants and soil — not a dietary supplement and not approved for human consumption. It hasn't been processed, tested or certified for human use, including the heavy-metal and microbial testing that food-grade products go through. If you want fulvic acid as a mineral supplement to take orally, look for a product specifically formulated and certified for human consumption (those will declare GMP manufacturing, food-grade processing and full heavy-metal testing on the certificate of analysis). Our fulvic acid powder is for plant and soil use only.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq0\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq0\"\u003eWhat is this 70% powder?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThis jar is enzymatic 70% fulvic acid powder, 99% water-soluble, packed in Stockport for foliar, drench and fertigation use. It is a garden biostimulant \/ chelator — not a human supplement. For the definition of fulvic acid itself (size, provenance, evidence), see \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-fulvic-acid\"\u003eWhat is fulvic acid?\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq1\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq1\"\u003eHow much fulvic acid do you put per litre of water?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eFor most garden uses with this powder, 0.5 to 1 g per litre as a foliar spray or 0.5–1 g per litre as a soil drench. Full crop tables: \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-apply-fulvic-acid\"\u003eHow to apply fulvic acid\u003c\/a\u003e. The most-cited tomato research (Suh et al. 2014) used 0.8 g\/L foliar at 10, 20 and 30 days after transplant. For ornamentals and roses the published range is 1 to 5 g\/L. Don't exceed 2 g\/L on edibles without specific evidence for that crop. For seeds, go far weaker: 80 mg per litre (0.08 g\/L) on damp kitchen paper until they sprout, the strength used in the Zhang 2021 tomato trial.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq2\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq2\"\u003eCan you apply too much fulvic acid?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes, and this is the most common mistake. The dose-response curve is non-linear. The Suh tomato trial showed 0.8 g\/L significantly increased fruit yield and plant size, while 1.6 g\/L (double the rate) produced smaller plants and smaller fruit. Rice seedling work shows the same pattern at lower concentrations: 0.05 g\/L stimulates root growth, 0.5 g\/L inhibits it. Researchers call this hormesis. Stick to published rates, start at the low end, and only step up if a few applications haven't produced visible results.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq3\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq3\"\u003eHow is this different from cheap fulvic acid imports?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eMethod and specs. This powder is produced by enzymatic hydrolysis — biological enzymes at ambient temperature — rather than alkaline extraction in hot potassium or sodium hydroxide, which destroys many heat-sensitive bioactive compounds and introduces process-derived potassium. The specs are also declared and verifiable: 70% fulvic acid by mass, 99% soluble in cold water, organic certified. Cheap \"fulvic acid\" imports are often lignosulphonate (paper-mill by-products) sold under the same name. A 2025 AOAC International survey of 25 commercial fulvic products found only 14 contained genuine fulvic acid on UV testing. Always look for declared specs and a certificate of analysis (ISO 19822 or AOAC 2024.07 LAMAR are the recognised test methods).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq4\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq4\"\u003eHow does this differ from humic acid?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSame chemical family, different jobs: fulvic is the small soluble fraction that works inside the plant; humic is larger and works mainly in the soil. Full compare and “which do I need?”: \u003ca href=\"\/blogs\/the-dr-forest-blog\/humic-vs-fulvic-acid\"\u003eHumic vs fulvic acid\u003c\/a\u003e. Pack rates for this powder stay on the How to Use tab; crop tables are on \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-apply-fulvic-acid\"\u003eHow to apply fulvic acid\u003c\/a\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq5\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq5\"\u003eWhy does the water I mix it with matter?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eHard UK tap water carries calcium and magnesium ions that bind to fulvic acid before it reaches the plant. The chelation effect you paid for gets used up on the calcium in your tap water. Rainwater is best. If only tap water is available, stand it for 24 hours to let chlorine outgas, then pre-acidify slightly with a few drops of dilute citric acid solution. The same logic applies to most liquid feeds you'd tank-mix with the fulvic.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq6\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq6\"\u003eHow long does it take to see results?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eRoot effects (denser, fuzzier root mass) usually appear within 2 to 4 weeks of consistent application. Drought-tolerance priming needs 3 to 4 weeks before the stress event to take effect; treatment after the plant is already wilting won't help. Yield and quality effects on fruit and flowers appear over a full growing season, since they depend on cumulative nutrient uptake and stress avoidance through the cycle. Don't expect dramatic week-one transformations on a plant that is already well-fed.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq7\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq7\"\u003eCan I mix fulvic acid with other fertilisers?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes, and the published trials repeatedly show combined applications outperform either input alone. Fulvic tank-mixes well with most liquid organic feeds, seaweed extracts, amino-acid biostimulants and trace mineral sprays — it's the carrier that makes the rest work harder. Avoid mixing with strongly alkaline products such as some lime washes or high-pH potassium silicate, which can precipitate the chelated complexes. Dissolve the fulvic in a little warm water, make up the feed in the can first, then add the dissolved fulvic last.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq8\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq8\"\u003eIs it safe for children, pets, bees and edible crops?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes for all those — when used as a garden input. Fulvic acid is a naturally occurring organic compound found in fertile soils. Non-toxic to mammals, birds, bees and soil organisms at any realistic application rate. It is organic certified. No withholding period for the edible crops you've sprayed or drenched — once the application has dried in or been absorbed, the garden is safe for children, pets and wildlife as normal. Note that this is a garden product, not a dietary supplement — see the supplement question above.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq9\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq9\"\u003eHow should I store the powder?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSealed, in a cool dry place out of sunlight. The powder is hygroscopic — it absorbs moisture from the air — and clumps if exposed to humidity. Clumping doesn't affect efficacy but makes weighing harder. Reseal after each use. Dry powder kept this way is stable for years. We've used powder from sealed bags 3 to 4 years old with no measurable loss of bioactivity. Working solution, on the other hand, supports microbial growth once diluted — mix what you need and use within 24 hours.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq10\" type=\"checkbox\"\u003e \u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-fa-faq10\"\u003eWhere is it made? Is this organic fulvic acid?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eHandcrafted in Stockport, Greater Manchester. The powder is produced by enzymatic hydrolysis to 70% fulvic acid by mass and 99% solubility in cold water, supplied in compostable packaging. It is organic certified.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-fa-faq-paa1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-fa-faq-paa1\" class=\"drf-faq-q\"\u003eCan I use fulvic and humic acid together?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eYes, and they do different jobs. Humic acid works mainly in the soil, building structure and holding nutrients. Fulvic is the small, soluble fraction that moves into the plant and carries trace elements with it. Water humic into the soil and use fulvic as a foliar spray or drench at 0.5–1 g per litre. If you mix them in one can, jar-test first and use rainwater, because hard tap water uses up the fulvic. We also sell them together as the \u003ca href=\"\/products\/humic-fulvic-acid-pair\"\u003eHumic \u0026amp; Fulvic Acid Pair\u003c\/a\u003e.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n","brand":"Dr Forest","offers":[{"title":"60g","offer_id":55424974193014,"sku":"DF-FULVIC-60G","price":6.49,"currency_code":"GBP","in_stock":true},{"title":"120g","offer_id":55424974225782,"sku":"DF-FULVIC-120G","price":7.99,"currency_code":"GBP","in_stock":true},{"title":"250g","offer_id":55424974258550,"sku":"DF-FULVIC-250G","price":12.99,"currency_code":"GBP","in_stock":true},{"title":"500g","offer_id":55424974291318,"sku":"DF-FULVIC-500G","price":19.99,"currency_code":"GBP","in_stock":true},{"title":"1kg","offer_id":55424974324086,"sku":"DF-FULVIC-1","price":35.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/organic-fulvic-acid-powder-humic-brown-resealable-pouch-dr-forest-957.webp?v=1785512767"},{"product_id":"organic-liquid-magnesium","title":"Liquid Magnesium 21% Mg | Organic Suspension","description":"\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; 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padding: 1em 1.2em; margin-bottom: 0.8em; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* ── FAQ (square +\/- with 1px gold border) ── *\/\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 600; color: var(--drf-grn); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.2em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border: 1px solid var(--drf-gold); background: transparent; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: var(--drf-muted); line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '−'; background: var(--drf-grn); color: #fff; border-color: var(--drf-grn); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 900px; }\n\n  \/* ── REFS \u0026 SEPARATOR (200px centred hairline) ── *\/\n  .drf-refs { font-size: 0.78em; color: #888; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs h4 { color: var(--drf-muted); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 1px solid var(--drf-gold); width: 200px; margin: 1.8em auto; }\n\n  \/* ── TABLE (dark-green header, alternating pale-green stripes) ── *\/\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn); color: #fff; font-weight: 600; padding: 0.6em 0.8em; text-align: left; font-size: 0.85em; letter-spacing: 0.04em; }\n  .drf-wrap table td { padding: 0.55em 0.8em; border-bottom: 1px solid var(--drf-border); }\n  .drf-wrap table tr:nth-child(even) td { background: var(--drf-grn-light); }\n\n  \/* ── FIGURES (optional — inline SVG charts) ── *\/\n  .drf-fig { margin: 1.2em 0 1.4em; border: 1px solid var(--drf-border); border-top: 2px solid var(--drf-gold); background: var(--drf-white); padding: 1em 1em 0.8em; }\n  .drf-fig svg { width: 100%; height: auto; display: block; }\n  .drf-fig-cap { font-size: 0.8em; color: var(--drf-muted); line-height: 1.55; margin-top: 0.7em; }\n  .drf-fig-cap strong { color: var(--drf-grn); }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\n\n\u003c!-- Dr Forest — Liquid Magnesium Fertiliser (v2 — Design System v1.0) — prefix lm — 4-tab --\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput type=\"radio\" name=\"drf-lm-tabset\" id=\"drf-lm-tab1\" checked\u003e \u003cinput type=\"radio\" name=\"drf-lm-tabset\" id=\"drf-lm-tab2\"\u003e \u003cinput type=\"radio\" name=\"drf-lm-tabset\" id=\"drf-lm-tab3\"\u003e \u003cinput type=\"radio\" name=\"drf-lm-tabset\" id=\"drf-lm-tab4\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-lm-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-lm-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-lm-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-lm-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\n\u003c!-- ═══════════ TAB 1 — OVERVIEW ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-lm-panel1\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eMade by Growers · Backed by Science\u003c\/span\u003e\n\u003ch2\u003eLiquid magnesium fertiliser: a micronised suspension with fulvic acid\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003e21% Magnesium\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eMicronised Carbonate\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eWith Fulvic Acid\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eFoliar \u0026amp; Soil Drench\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eACO Certified Organic\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eRecycled Plastic Bottle\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-dark\"\u003ePacked in Stockport\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eDr Forest Liquid Magnesium is an organic liquid magnesium fertiliser: micronised magnesium carbonate held in suspension by fulvic acid, at 21% magnesium, ready to dilute for a foliar spray or a soil drench.\u003c\/strong\u003e The carbonate particles dissolve gradually in soil moisture rather than all at once, and the fulvic acid does two jobs: it keeps the mineral suspended in the bottle, and it helps carry magnesium into the leaf and through the root.\u003c\/p\u003e\n\u003cp\u003eMagnesium is the atom at the centre of every chlorophyll molecule, so a plant short of it goes yellow between the veins (interveinal chlorosis), older leaves first. For bulk soil correction over whole beds, our granular \u003ca href=\"\/products\/kieserite-magnesium-sulphate-fertiliser\"\u003eKieserite magnesium sulphate\u003c\/a\u003e is the better fit.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e21%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMagnesium (Mg)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e3–6 ml\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003ePer litre, foliar\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e6–10 ml\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003ePer litre, soil drench\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e2–4 wk\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eBetween applications\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat liquid magnesium is used for in the garden\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnesium deficiency in plants\u003c\/strong\u003e — a foliar spray puts magnesium straight onto the yellowing leaves; the directions below give a 7–14 day window for visible improvement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTomatoes, peppers and other heavy fruiters in pots\u003c\/strong\u003e — high-potash feeding through fruiting pushes magnesium out of the uptake queue. A drench every 2–4 weeks keeps magnesium going in without cutting the potash.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoses and flowering shrubs\u003c\/strong\u003e — magnesium keeps the foliage dark green while the plant is putting its effort into flower. Read the evidence first in \u003ca href=\"\/blogs\/the-dr-forest-blog\/epsom-salt-for-roses-does-it-actually-work-2\"\u003eEpsom salt for roses: does it actually work?\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight, sandy or acid soils\u003c\/strong\u003e — the soils most likely to run short, and the ones to keep topped up with a maintenance drench through the season.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall gardens and a few pots\u003c\/strong\u003e — measured in millilitres from the bottle, with no powder to weigh out and dissolve for a single can.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil biology\u003c\/strong\u003e — every drench adds a little fulvic carbon to the root zone alongside the mineral.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy a micronised suspension rather than Epsom salt?\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eLiquid Magnesium suspension (this product)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMicronised magnesium carbonate, 21% Mg, in a fulvic acid carrier\u003c\/li\u003e\n\u003cli\u003eCarbonate particles dissolve gradually: one application feeds for weeks\u003c\/li\u003e\n\u003cli\u003eShake, measure, dilute: 3–6 ml per litre foliar, 6–10 ml per litre drench\u003c\/li\u003e\n\u003cli\u003eFulvic acid to help the magnesium into the leaf and the root\u003c\/li\u003e\n\u003cli\u003eCertified organic by ACO (input 456AI); no synthetic chelates, no animal by-products\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eEpsom salt (magnesium sulphate)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFully soluble, so the whole dose is available at once and moves with drainage water\u003c\/li\u003e\n\u003cli\u003eNeeds weighing out and dissolving from dry each time\u003c\/li\u003e\n\u003cli\u003eSupplies sulphur as well as magnesium, which is useful where both are short\u003c\/li\u003e\n\u003cli\u003eMore economical for bulk soil correction over large beds\u003c\/li\u003e\n\u003cli\u003eNo carrier and no fulvic acid\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003ePacked in Stockport\u003c\/span\u003e\n\u003cp\u003eDr Forest is a small-batch fertiliser business in Stockport, Greater Manchester. This is a certified organic feed with no animal by-products, packed in recycled plastic. If your tomato leaves are already yellowing, start with \u003ca href=\"\/blogs\/the-dr-forest-blog\/why-are-my-tomato-leaves-turning-yellow\"\u003eour UK guide to magnesium deficiency in tomato plants\u003c\/a\u003e to confirm the diagnosis before you spray. \u003cem\u003eMade by Growers. Backed by Science.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- ═══════════ TAB 2 — THE SCIENCE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-lm-panel2\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eThe Science\u003c\/span\u003e\n\u003ch2\u003eThe science of liquid magnesium: what the mineral and the carrier each do\u003c\/h2\u003e\n\u003ch3\u003eWhat is in the bottle\u003c\/h3\u003e\n\u003cp\u003eTwo functional ingredients. The first is magnesium carbonate, milled to a fine particle size so it stays in suspension and presents a large surface area to soil moisture. Carbonate is only sparingly soluble, which is the point: it releases magnesium a little at a time as the soil water around it turns over. The second is fulvic acid, the smallest, most mobile fraction of humic substances. In this product it is both the suspension carrier and a chelator for the magnesium.\u003c\/p\u003e\n\u003cp\u003eFulvic acid is a low-molecular-weight organic acid with plenty of acid groups that bind metal ions. The case for it as a carrier is that magnesium held in a fulvic complex should cross the waxy leaf cuticle and the root cell membrane more readily than a bare ion. The evidence we can cite for that is indirect, and it comes from the humic research under mechanism 06. If you want the longer version, read \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-fulvic-acid\"\u003eWhat is fulvic acid?\u003c\/a\u003e\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eComposition and analysis\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium (Mg)\u003c\/td\u003e\n\u003ctd\u003e21%\u003c\/td\u003e\n\u003ctd\u003eMicronised magnesium carbonate, in suspension\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium as oxide (MgO)\u003c\/td\u003e\n\u003ctd\u003eapprox. 35%\u003c\/td\u003e\n\u003ctd\u003eCalculated from 21% Mg for comparison with bagged fertilisers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFulvic acid\u003c\/td\u003e\n\u003ctd\u003eCarrier\u003c\/td\u003e\n\u003ctd\u003eNatural humic extract; suspension agent and chelator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eLiquid concentrate\u003c\/td\u003e\n\u003ctd\u003eReady to dilute; recycled plastic bottle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor scale, Kieserite is 25% MgO and Epsom salt about 16% MgO, both as soluble sulphate. This product goes on at millilitres per litre of water, and by the foliar route it bypasses the soil entirely.\u003c\/p\u003e\n\u003cdiv class=\"drf-pullquote\"\u003eOnly 15 to 35 per cent of the magnesium a plant takes up ends up in chlorophyll. The rest is stored in the vacuole or goes into making protein.\u003c\/div\u003e\n\u003ch3\u003eMechanisms of action\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eMagnesium sits at the centre of chlorophyll\u003c\/h4\u003e\n\u003cp\u003eRoughly 15–35% of the magnesium a plant absorbs is fixed in chlorophyll; the remainder goes to the vacuole and to protein synthesis, and magnesium is a cofactor for more than 300 enzymes involved in chlorophyll synthesis and carbon fixation (Ishfaq et al., 2022, \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e) [1]. Short the plant and it cannot build the pigment, which is why the leaf goes yellow.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eDeficiency shows on old leaves first, and sugar backs up in the leaf\u003c\/h4\u003e\n\u003cp\u003eMagnesium is mobile in the plant, so when supply runs short the plant strips it out of mature leaves to feed new growth: interveinal chlorosis appears on older, fully expanded leaves and works upward as the deficiency deepens [1]. Sugars also pile up in the source leaves, a major consequence of magnesium shortage that most probably holds growth back by turning down photosynthesis (Verbruggen \u0026amp; Hermans, 2013, \u003cem\u003ePlant and Soil\u003c\/em\u003e) [2]. The same review notes that reliable markers for early deficiency are still hard to find, so the old-leaf yellowing remains the sign to go on.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003ePotassium antagonism, the container-tomato problem\u003c\/h4\u003e\n\u003cp\u003ePotassium, calcium, ammonium and sodium all compete with magnesium for uptake [1]. In a nutrient-solution trial on sugarcane, raising the potassium dose cut magnesium concentration in every plant part, roots most of all, and at very high potassium doses produced deficiency symptoms even where magnesium supply was adequate (Garcia et al., 2022, \u003cem\u003ePlant and Soil\u003c\/em\u003e) [3]. A tomato in a pot on a high-potash feed faces the same competition at the root.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eMagnesium fertiliser pays, and most on the soils that need it\u003c\/h4\u003e\n\u003cp\u003eA meta-analysis of 570 paired observations from 99 field studies across ten countries found that magnesium fertilisation raised yield by a mean 8.5%, with fruit crops at 12.5% and vegetables at 8.9%. On soils with exchangeable Mg below 60 mg\/kg the gain was 9.4%, roughly double the 4.9% seen on soils above 120 mg\/kg (Wang et al., 2020, \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e) [4]. The analysis covered soil-applied magnesium only, so it tells you nothing about the spray.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eWhy magnesium goes missing from the soil\u003c\/h4\u003e\n\u003cp\u003eMagnesium is more mobile in soil than potassium, calcium or ammonium, and that mobility makes a soil test figure hard to translate into what the plant can actually take up (Gransee \u0026amp; Führs, 2013, \u003cem\u003ePlant and Soil\u003c\/em\u003e) [5]. The same review puts deficiency on acid soils down to acidity crowding magnesium off the soil's exchange sites so that it leaches away, and notes that sandy soils hold less magnesium than clays and silts to begin with. Guo et al. (2016, \u003cem\u003eThe Crop Journal\u003c\/em\u003e) add the wider picture: magnesium has been the overlooked macronutrient, and the magnesium in cereal grain has declined over time [6].\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003eFulvic acid as the delivery vehicle\u003c\/h4\u003e\n\u003cp\u003eNardi et al. (2002, \u003cem\u003eSoil Biology and Biochemistry\u003c\/em\u003e) review the evidence that the effect of humic substances depends in part on molecular size: the low-molecular-size fraction, below 3,500 daltons, reaches the plasma membrane of plant cells and is partly taken up, and it improves the uptake of some nutrients, nitrate in particular [7]. Canellas et al. (2015, \u003cem\u003eScientia Horticulturae\u003c\/em\u003e) review the humic and fulvic biostimulant literature and report changes in roots and shoots linked to nutrient uptake, assimilation and distribution, promotion of lateral roots and shifts in metabolism related to abiotic stress tolerance [8].\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003cp\u003eWe cannot show you a trial of this exact bottle against Epsom salt on a tomato in a pot. The literature above is the mechanism; the rates in the How to Use tab are the ones we recommend.\u003c\/p\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific references\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eIshfaq, M., Wang, Y., Yan, M., Wang, Z., Wu, L., Li, C. \u0026amp; Li, X. (2022). Physiological essence of magnesium in plants and its widespread deficiency in the farming system of China. \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e, 13, 802274.\u003c\/li\u003e\n\u003cli\u003eVerbruggen, N. \u0026amp; Hermans, C. (2013). Physiological and molecular responses to magnesium nutritional imbalance in plants. \u003cem\u003ePlant and Soil\u003c\/em\u003e, 368, 87–99.\u003c\/li\u003e\n\u003cli\u003eGarcia, A., Crusciol, C.A.C., Rosolem, C.A., Bossolani, J.W., Nascimento, C.A.C., McCray, J.M., dos Reis, A.R. \u0026amp; Cakmak, I. (2022). Potassium-magnesium imbalance causes detrimental effects on growth, starch allocation and Rubisco activity in sugarcane plants. \u003cem\u003ePlant and Soil\u003c\/em\u003e, 472, 225–238.\u003c\/li\u003e\n\u003cli\u003eWang, Z., Hassan, M.U., Nadeem, F., Wu, L., Zhang, F. \u0026amp; Li, X. (2020). Magnesium fertilization improves crop yield in most production systems: a meta-analysis. \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e, 10, 1727.\u003c\/li\u003e\n\u003cli\u003eGransee, A. \u0026amp; Führs, H. (2013). Magnesium mobility in soils as a challenge for soil and plant analysis, magnesium fertilization and root uptake under adverse growth conditions. \u003cem\u003ePlant and Soil\u003c\/em\u003e, 368, 5–21.\u003c\/li\u003e\n\u003cli\u003eGuo, W., Nazim, H., Liang, Z. \u0026amp; Yang, D. (2016). Magnesium deficiency in plants: an urgent problem. \u003cem\u003eThe Crop Journal\u003c\/em\u003e, 4(2), 83–91.\u003c\/li\u003e\n\u003cli\u003eNardi, S., Pizzeghello, D., Muscolo, A. \u0026amp; Vianello, A. (2002). Physiological effects of humic substances on higher plants. \u003cem\u003eSoil Biology and Biochemistry\u003c\/em\u003e, 34(11), 1527–1536.\u003c\/li\u003e\n\u003cli\u003eCanellas, L.P., Olivares, F.L., Aguiar, N.O., Jones, D.L., Nebbioso, A., Mazzei, P. \u0026amp; Piccolo, A. (2015). Humic and fulvic acids as biostimulants in horticulture. \u003cem\u003eScientia Horticulturae\u003c\/em\u003e, 196, 15–27.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-lm-panel3\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eHow to Use\u003c\/span\u003e\n\u003ch2\u003eHow to use liquid magnesium: application rates and guide\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eShake well before every use\u003c\/span\u003e\n\u003cp\u003eThis is a mineral suspension, not a true solution. Shake the bottle vigorously for 15–20 seconds before each use. When diluting, add the concentrate to a small amount of warm water (20–30°C) first and stir well before adding the remaining water.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eA magnesium supplement, not a complete feed\u003c\/span\u003e\n\u003cp\u003eThis bottle supplies \u003cstrong\u003emagnesium and fulvic acid only\u003c\/strong\u003e. Keep using your main fertiliser alongside it. If the yellowing is on the young leaves rather than the old ones, it is probably not magnesium; check the diagnosis before you spray.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 3–6 ml per litre of water  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks during the growing season\u003c\/div\u003e\n\u003cp\u003eApply as a fine mist to both leaf surfaces in early morning or late evening. Ensure thorough coverage including leaf undersides. The fulvic acid improves leaf cuticle penetration. Visible improvement in chlorosis typically appears within 7–14 days.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil drench, root zone application\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 6–10 ml per litre of water  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks during the growing season\u003c\/div\u003e\n\u003cp\u003eDilute and apply directly to the root zone. Water in afterwards. Use the higher rate (10 ml\/L) for visibly deficient plants or known-low Mg soils. Use the lower rate for maintenance feeding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eIntensive correction, deficient crops\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10 ml per litre (soil) or 6 ml per litre (foliar)  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–3 weeks until symptoms resolve\u003c\/div\u003e\n\u003cp\u003eCombine foliar and root applications for fastest correction: foliar for immediate leaf response, root drench for sustained soil-level replenishment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRate table\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSituation\u003c\/th\u003e\n\u003cth\u003eRate\u003c\/th\u003e\n\u003cth\u003ePer 10-litre can\u003c\/th\u003e\n\u003cth\u003eFrequency\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFoliar spray\u003c\/td\u003e\n\u003ctd\u003e3–6 ml per litre of water\u003c\/td\u003e\n\u003ctd\u003e30–60 ml\u003c\/td\u003e\n\u003ctd\u003eEvery 2–4 weeks during the growing season\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSoil drench, root zone\u003c\/td\u003e\n\u003ctd\u003e6–10 ml per litre of water; the higher rate (10 ml\/L) for visibly deficient plants or known-low Mg soils, the lower rate for maintenance feeding\u003c\/td\u003e\n\u003ctd\u003e60–100 ml\u003c\/td\u003e\n\u003ctd\u003eEvery 2–4 weeks during the growing season\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntensive correction, deficient crops\u003c\/td\u003e\n\u003ctd\u003e10 ml per litre (soil) or 6 ml per litre (foliar)\u003c\/td\u003e\n\u003ctd\u003e100 ml soil, 60 ml foliar\u003c\/td\u003e\n\u003ctd\u003eEvery 2–3 weeks until symptoms resolve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eStep-by-step preparation\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eShake the bottle vigorously\u003c\/strong\u003e for 15–20 seconds. The particles settle during storage; thorough shaking is essential.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure the concentrate.\u003c\/strong\u003e For a 10-litre watering can: 30–60 ml for foliar spray, or 60–100 ml for soil drench.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdd to a small amount of warm water first\u003c\/strong\u003e (20–30°C) and stir well, then add the remaining water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply immediately.\u003c\/strong\u003e Foliar: fine mist to both leaf surfaces. Soil: evenly around the root zone.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStore sealed between 5–25°C,\u003c\/strong\u003e away from direct sunlight. Shake before every use.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003ePair with \u003ca href=\"\/products\/organic-seaweed-powder-concentrated-100-soluble-fertiliser-dr\"\u003eSeaweed Extract Powder\u003c\/a\u003e in a foliar tank mix: alginic acid improves leaf wetting while fulvic acid helps uptake. Use alongside any \u003ca href=\"\/collections\/crop-specific-fertilisers\"\u003eDr Forest crop-specific fertiliser\u003c\/a\u003e where additional magnesium is needed. Combine with \u003ca href=\"\/products\/organic-amino-chelated-calcium\"\u003eAmino Chelated Calcium\u003c\/a\u003e for a foliar calcium and magnesium programme during fruiting. For bulk soil correction on beds and borders, \u003ca href=\"\/products\/kieserite-magnesium-sulphate-fertiliser\"\u003eKieserite\u003c\/a\u003e is the economical soluble option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eStorage\u003c\/span\u003e\n\u003cp\u003eKeep the cap on tight and the bottle sealed between 5–25°C, out of direct sunlight. The mineral will settle to the bottom between uses; that is normal for a suspension and a good shake brings it back. Keep away from children and pets, and wash hands after handling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- ═══════════ TAB 4 — FAQ ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-lm-panel4\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eQuestions \u0026amp; Answers\u003c\/span\u003e\n\u003ch2\u003eFrequently asked questions about liquid magnesium\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq1\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq1\"\u003eWhat is liquid magnesium fertiliser and what does it do?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt is a concentrate of micronised magnesium carbonate suspended in fulvic acid, at 21% magnesium. Diluted at 3–6 ml per litre it is a foliar spray for interveinal yellowing; at 6–10 ml per litre it is a soil drench that keeps magnesium topped up through the season. Magnesium sits at the core of the chlorophyll molecule, so the plant needs it to keep its leaves green and photosynthesis running.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq2\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq2\"\u003eHow do I know my plants have a magnesium deficiency?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eLook at the older leaves, low down on the plant. Magnesium deficiency shows as yellowing between the veins while the veins themselves stay green, starting on mature leaves and moving up as it gets worse. If the young leaves at the top are yellowing first, suspect iron or another immobile nutrient instead. Tomatoes in pots on a high-potash feed are the classic case; \u003ca href=\"\/blogs\/the-dr-forest-blog\/why-are-my-tomato-leaves-turning-yellow\"\u003eour guide to yellow tomato leaves\u003c\/a\u003e walks through telling the causes apart.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq3\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq3\"\u003eIs this better than Epsom salt?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eDifferent job. Epsom salt is fully soluble, so the whole dose is available straight away and then moves on with drainage water; it also brings sulphur. This suspension releases from carbonate particles over weeks and comes with a fulvic acid carrier that helps uptake through leaf and root. There is nothing to weigh out; you shake the bottle and measure it into the can. For a foliar spray or feeding a few pots, use this. For correcting a whole bed cheaply, use a soluble magnesium sulphate such as our \u003ca href=\"\/products\/kieserite-magnesium-sulphate-fertiliser\"\u003eKieserite\u003c\/a\u003e.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq4\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq4\"\u003eCan I use it as a magnesium foliar spray on tomatoes and roses?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes, that is its main use. Mix 3–6 ml per litre, spray both leaf surfaces early morning or late evening, and repeat every 2–4 weeks through the growing season. For a plant that is visibly deficient, use the 6 ml foliar rate together with a 10 ml per litre drench every 2–3 weeks until the symptoms resolve.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq5\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq5\"\u003eWhat does the fulvic acid do?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThree things. It keeps the micronised particles in suspension so the bottle stays usable. It binds the magnesium in an organic complex, which is meant to help it into the leaf and the root. And it is a small dose of humic carbon for the soil biology with every drench. The chemistry is covered in \u003ca href=\"\/blogs\/the-dr-forest-blog\/what-is-fulvic-acid\"\u003eWhat is fulvic acid?\u003c\/a\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq6\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq6\"\u003eWhy do I need to shake the bottle?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThe micronised particles are held in the liquid rather than dissolved in it, so they settle to the bottom during storage. Shaking for 15–20 seconds resuspends them evenly so every measure carries the same amount of magnesium. Add the concentrate to a little warm water first, stir, then top up.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq7\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq7\"\u003eCan I mix it with other fertilisers or use it through drip irrigation?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt pairs with seaweed extract in a foliar tank mix, and with our amino chelated calcium in a foliar calcium and magnesium programme during fruiting. Use it alongside your main feed where extra magnesium is needed. Because fine particles are present, it suits drip irrigation with adequate filtration; where you need a fully soluble magnesium, Epsom salt is more practical.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq8\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq8\"\u003eIs it safe for children, pets, bees and wildlife?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNon-toxic when used as directed. It is a mineral carbonate and a natural humic extract. Avoid ingestion and eye contact, wash hands after handling, and keep the concentrate out of reach. Once applied and watered in, the area is safe for normal use. Spray in the early morning or evening when bees are not working the flowers.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq9\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq9\"\u003eIs this an organic magnesium fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. It is certified organic by ACO (Australian Certified Organic), registered farm input 456AI. The magnesium is a natural magnesium carbonate mineral and the fulvic acid is a natural humic extract, with no synthetic chelating agents and no animal by-products, and it is vegan.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-lm-faq10\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-lm-faq10\"\u003eHow should I store it, and is the bottle recyclable?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eSealed, between 5–25°C, out of direct sunlight, and shaken before every use. The bottle is recycled plastic; rinse it and recycle it through your local collection when it is empty.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"Dr Forest","offers":[{"title":"1 litre","offer_id":56323587146102,"sku":"DF-LIQMAG-1L","price":19.99,"currency_code":"GBP","in_stock":true},{"title":"500ml","offer_id":56323587178870,"sku":"DF-LIQMAG-500ML","price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/liquid-suspension-fertiliser-micronised-magnesium-certified-organic-312.webp?v=1786553587"},{"product_id":"sulphur-soil-acidifier","title":"Soil Acidifier | 90% Sulphur Pastilles","description":"\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-grn-dark:   #0F2A1F;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-cream:      #F5F2EC;\n    --drf-border:     #d4cfc5;\n    --drf-muted:      #3A4A40;\n    --drf-white:      #FFFFFF;\n  }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; font-weight: 600; font-size: 0.85em; letter-spacing: 0.2em; text-transform: uppercase; color: var(--drf-muted); margin: 1.2em 0 0.3em; }\n  .drf-wrap p { margin-bottom: 0.9em; }\n  .drf-wrap ul { padding-left: 1.2em; margin-bottom: 0.9em; }\n  .drf-wrap ul li { margin-bottom: 0.35em; }\n  .drf-wrap strong { font-weight: 500; color: var(--drf-grn); }\n  .drf-wrap em { font-style: italic; color: var(--drf-muted); }\n  .drf-wrap a { color: var(--drf-grn); text-decoration: underline; text-underline-offset: 2px; }\n\n  \/* ── BADGES ── *\/\n  .drf-badge-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; margin: 0 0 12px; }\n  .drf-badge { padding: 9px 12px; font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; justify-content: center; text-align: center; min-height: 36px; line-height: 1.3; }\n  .drf-badge-green { background: #eaf4ea; color: #2d6a2d; border: 1px solid #c0d8b0; }\n  .drf-badge-gold  { background: #fdf6e3; color: #8b6914; border: 1px solid #e0cc80; }\n  .drf-badge-dark  { background: var(--drf-grn-dark); color: #d4e4c8; border: 1px solid #2d6a2d; }\n\n  \/* ── STATS (white cards, gold top border on the grid) ── *\/\n  .drf-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--drf-border); border: 1px solid var(--drf-border); border-top: 2px solid var(--drf-gold); margin: 1.2em 0; max-width: 100%; }\n  .drf-stat { background: var(--drf-white); padding: 0.7em 0.5em; text-align: center; }\n  .drf-stat-number { font-family: 'Cormorant Garamond', serif; font-size: 1.45em; font-weight: 400; color: var(--drf-grn); line-height: 1.1; display: block; }\n  .drf-stat-label { font-size: 0.62em; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--drf-gold); display: block; margin-top: 0.3em; }\n\n  \/* ── TABS ── *\/\n  .drf-tabs-wrap { max-width: 100%; overflow: hidden; }\n  .drf-tabs-wrap input[type=\"radio\"] { display: none; }\n  .drf-tab-labels { display: flex; align-items: stretch; border-bottom: 2px solid var(--drf-border); margin-bottom: 1.2em; }\n  .drf-tab-labels label { flex: 1 1 0; padding: 0.75em 0.4em; font-size: 0.82em; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: #8b6914; background: var(--drf-gold-light); cursor: pointer; text-align: center; display: flex; align-items: center; justify-content: center; border-bottom: 3px solid var(--drf-gold); margin-bottom: -2px; transition: all 0.15s; }\n  .drf-tab-labels label:hover { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); }\n  .drf-panel { display: none; }\n  #drf-su-tab1:checked ~ .drf-tab-labels label[for=\"drf-su-tab1\"],\n  #drf-su-tab2:checked ~ .drf-tab-labels label[for=\"drf-su-tab2\"],\n  #drf-su-tab3:checked ~ .drf-tab-labels label[for=\"drf-su-tab3\"],\n  #drf-su-tab4:checked ~ .drf-tab-labels label[for=\"drf-su-tab4\"] { color: var(--drf-grn); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn); font-weight: 700; }\n  #drf-su-tab1:checked ~ .drf-panels #drf-su-panel1,\n  #drf-su-tab2:checked ~ .drf-panels #drf-su-panel2,\n  #drf-su-tab3:checked ~ .drf-panels #drf-su-panel3,\n  #drf-su-tab4:checked ~ .drf-panels #drf-su-panel4 { display: block; }\n\n  \/* ── CALLOUTS ── *\/\n  .drf-callout { background: var(--drf-grn-light); border-left: 3px solid var(--drf-grn); padding: 1em 1.2em; margin: 1.2em 0; }\n  .drf-callout-gold { background: var(--drf-gold-light); border-left-color: var(--drf-gold); }\n  .drf-callout-dark { background: var(--drf-grn-dark); color: var(--drf-cream); border-left-color: var(--drf-gold); }\n  .drf-callout-dark p { color: var(--drf-cream); }\n  .drf-callout-dark strong { color: var(--drf-gold); }\n  .drf-callout p:last-child { margin-bottom: 0; }\n  .drf-callout-title { font-size: 0.72em; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--drf-grn); margin-bottom: 0.4em; display: block; }\n  .drf-callout-gold .drf-callout-title { color: var(--drf-gold); }\n  .drf-callout-dark .drf-callout-title { color: var(--drf-gold); }\n\n  \/* ── PULL QUOTE ── *\/\n  .drf-pullquote { font-family: 'Cormorant Garamond', serif; font-style: italic; font-weight: 400; font-size: 1.4em; color: var(--drf-grn); text-align: center; padding: 1.4em 1em; margin: 1.8em auto; max-width: 80%; line-height: 1.5; border-top: 1px solid var(--drf-gold); border-bottom: 1px solid var(--drf-gold); }\n\n  \/* ── MECH CARDS ── *\/\n  .drf-mech { border: 1px solid var(--drf-border); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 0.8em 0; background: var(--drf-grn-light); }\n  .drf-mech-num { font-family: 'Cormorant Garamond', serif; font-size: 2em; font-weight: 400; color: var(--drf-gold); line-height: 1; }\n  .drf-mech h4 { margin-top: 0.2em; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-weight: 600; }\n  .drf-mech p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n\n  \/* ── RATE CARDS ── *\/\n  .drf-rate { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin: 0.8em 0; background: var(--drf-grn-light); }\n  .drf-rate h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.5em; margin-bottom: 0.6em; }\n  .drf-rate-meta { font-size: 0.85em; color: var(--drf-muted); margin-bottom: 0.5em; }\n  .drf-rate-meta strong { color: var(--drf-gold); }\n  .drf-rate p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n\n  \/* ── STEPS (square block numbers) ── *\/\n  .drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n  .drf-steps li { counter-increment: drf-step; padding: 0.8em 0 0.8em 3em; position: relative; border-bottom: 1px solid #eee; }\n  .drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.8em; width: 2em; height: 2em; background: var(--drf-grn); color: #fff; font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 0.9em; display: flex; align-items: center; justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n\n  \/* ── USE-CASE LIST (1px hairline borders) ── *\/\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 1px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn); }\n\n  \/* ── COMPARISON BOXES ── *\/\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 400; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* ── FAQ (square +\/- with gold border) ── *\/\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 600; color: var(--drf-grn); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.2em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border: 1px solid var(--drf-gold); background: transparent; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: var(--drf-muted); line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '−'; background: var(--drf-grn); color: #fff; border-color: var(--drf-grn); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 900px; }\n\n  \/* ── REFS \u0026 SEPARATOR (200px hairline) ── *\/\n  .drf-refs { font-size: 0.78em; color: #888; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n  .drf-sep { border: none; border-top: 1px solid var(--drf-gold); width: 200px; margin: 1.8em auto; }\n\n  \/* ── TABLE ── *\/\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn); color: #fff; font-weight: 600; padding: 0.6em 0.8em; text-align: left; font-size: 0.85em; letter-spacing: 0.04em; }\n  .drf-wrap table td { padding: 0.55em 0.8em; border-bottom: 1px solid var(--drf-border); }\n  .drf-wrap table tr:nth-child(even) td { background: var(--drf-grn-light); }\n\n  \/* ── FIGURES \/ GRAPHS (v1.0 additions) ── *\/\n  .drf-fig { margin: 1.2em 0 1.4em; border: 1px solid var(--drf-border); border-top: 2px solid var(--drf-gold); background: var(--drf-white); padding: 1em 1em 0.8em; }\n  .drf-fig svg { width: 100%; height: auto; display: block; }\n  .drf-fig-cap { font-size: 0.8em; color: var(--drf-muted); line-height: 1.55; margin-top: 0.7em; }\n  .drf-fig-cap strong { color: var(--drf-grn); }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput checked id=\"drf-su-tab1\" name=\"drf-su-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-su-tab2\" name=\"drf-su-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-su-tab3\" name=\"drf-su-tabset\" type=\"radio\"\u003e \u003cinput id=\"drf-su-tab4\" name=\"drf-su-tabset\" type=\"radio\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-su-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-su-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-su-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-su-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ============ OVERVIEW ============ --\u003e\n\u003cdiv id=\"drf-su-panel1\" class=\"drf-panel\"\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cdiv class=\"drf-badge drf-badge-green\"\u003e90% S + 10% Bentonite\u003c\/div\u003e\n\u003cdiv class=\"drf-badge drf-badge-gold\"\u003eLowers Soil pH\u003c\/div\u003e\n\u003cdiv class=\"drf-badge drf-badge-dark\"\u003eEricaceous \u0026amp; Blueberries\u003c\/div\u003e\n\u003cdiv class=\"drf-badge drf-badge-green\"\u003ePacked in Stockport\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eSulphur soil acidifier — lower your soil pH the natural way\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eSulphur soil acidifier is elemental sulphur (S) that soil bacteria oxidise into sulphuric acid\u003c\/strong\u003e, which lowers soil pH so acid-loving, ericaceous (lime-hating) plants can take up iron and manganese properly. Ours is a sulphur-bentonite pastille — \u003cstrong\u003e90% elemental sulphur with 10% bentonite clay\u003c\/strong\u003e. Spread it dry with no dust, then the moment it gets wet the bentonite swells and bursts the pastille apart into fine sulphur particles, giving the bacteria the surface area they need. It's the standard way to bring neutral or alkaline ground down towards pH 5.0–6.0 for blueberries, rhododendrons, azaleas and camellias.\u003c\/p\u003e\n\u003cp\u003eYou'll also see elemental sulphur sold as garden sulphur, yellow sulphur, sulphur chips or pastilles. Plain chips and granules have to weather down before much happens; the pastille breaks apart on wetting and releases its sulphur where you put it. Because the acid is still made by soil biology it isn't instant — it works from spring to autumn when soils are warm, and rewards re-testing rather than guessing. Once you reach your target it holds the pH down for years.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e90%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eElemental sulphur (S)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003epH 5–6\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eEricaceous target\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e55–175\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eg\/m² per pH unit, by soil type\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e2×\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eH⁺ ions per S atom\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat it's for\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlueberries \u0026amp; cranberries\u003c\/strong\u003e — the most acid-hungry, pH 4.5–5.5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRhododendrons, azaleas \u0026amp; camellias\u003c\/strong\u003e — classic ericaceous shrubs, pH 4.5–6.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcers, pieris \u0026amp; summer heathers\u003c\/strong\u003e — acid-loving structure and foliage. Winter heathers (\u003cem\u003eErica carnea\u003c\/em\u003e, \u003cem\u003eE.\u003c\/em\u003e × \u003cem\u003edarleyensis\u003c\/em\u003e) tolerate lime and do not need this\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eNeutral or alkaline beds\u003c\/strong\u003e — nudge them down for acid-lovers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRaised beds\u003c\/strong\u003e — mix in before planting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSulphur vs the quick fixes\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eSulphur-bentonite pastilles\u003c\/h4\u003e\n\u003cp\u003eNeeds seven to eight times less material than the sulphates for the same drop, and holds for years. Handles like a granule, then breaks apart on wetting and releases fine sulphur where you put it. The acid is made by soil bacteria, so allow a full season for the change to develop.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eIron or aluminium sulphate\u003c\/h4\u003e\n\u003cp\u003eAct faster, but you need roughly 7–8× as much for the same drop, they can lock up phosphorus, and aluminium can build up in the soil. Better for a quick nudge than a lasting change \u003cem\u003e(RHS)\u003c\/em\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003ePacked in Stockport\u003c\/span\u003e\n\u003cp\u003eWeighed and packed by hand in small batches at our workshop in Stockport. The pastilles themselves are made by co-melting sulphur with the bentonite — nothing we blend, and nothing we add to.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ============ THE SCIENCE ============ --\u003e\n\u003cdiv id=\"drf-su-panel2\" class=\"drf-panel\"\u003e\n\u003ch2\u003eThe science: how sulphur acidifies soil\u003c\/h2\u003e\n\u003cp\u003eElemental sulphur doesn't acidify soil on its own. Sulphur-oxidising bacteria — mainly \u003cem\u003eThiobacillus\u003c\/em\u003e and \u003cem\u003eAcidithiobacillus\u003c\/em\u003e — use it as an energy source and convert it to sulphate, releasing hydrogen ions as they go. It's those H⁺ ions that lower pH.\u003c\/p\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eThe oxidation reaction\u003c\/span\u003e\n\u003cp\u003eCO₂ + S⁰ + ½O₂ + 2H₂O → CH₂O + SO₄²⁻ + \u003cstrong\u003e2H⁺\u003c\/strong\u003e — two hydrogen ions for every sulphur atom oxidised (Havlin et al., 1999; Ohio State Extension). The sulphate left behind is also a plant nutrient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWarmth and moisture set the speed\u003c\/h3\u003e\n\u003cdiv class=\"drf-fig\"\u003e\n\u003csvg viewbox=\"0 0 680 320\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n\u003ctitle\u003eRelative sulphur oxidation rate versus soil temperature\u003c\/title\u003e\n\u003cdesc\u003eOxidation slows sharply as soil cools, roughly fourfold for every 10 degrees C, rises steeply with warmth and plateaus between 30 and 40 degrees C, then falls.\u003c\/desc\u003e\n\n\u003cline x1=\"70\" y1=\"30\" x2=\"70\" y2=\"250\" stroke=\"#d4cfc5\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"70\" y1=\"250\" x2=\"655\" y2=\"250\" stroke=\"#d4cfc5\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\n\u003cline x1=\"70\" y1=\"140\" x2=\"655\" y2=\"140\" stroke=\"#efece4\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"70\" y1=\"30\" x2=\"655\" y2=\"30\" stroke=\"#efece4\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003ctext x=\"62\" y=\"253\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e0\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"143\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e50\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"34\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e100\u003c\/text\u003e\n\u003ctext x=\"20\" y=\"145\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\" transform=\"rotate(-90 20 145)\"\u003eRelative oxidation (%)\u003c\/text\u003e\n\n\u003crect x=\"113.5\" y=\"30\" width=\"145\" height=\"220\" fill=\"#C5A55A\" opacity=\"0.12\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"186\" y=\"46\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#8b6914\"\u003eTypical UK soil 8–18°C\u003c\/text\u003e\n\n\u003cpolyline points=\"70,239 142.5,221 215,184 287.5,136 360,85 432.5,48 505,30 577.5,37 650,144\" fill=\"none\" stroke=\"#1B3D2F\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\n\u003cline x1=\"432.5\" y1=\"30\" x2=\"577.5\" y2=\"30\" stroke=\"#C5A55A\" stroke-width=\"3\"\u003e\u003c\/line\u003e\n\u003ctext x=\"505\" y=\"20\" text-anchor=\"middle\" font-family=\"Cormorant Garamond,serif\" font-size=\"13\" fill=\"#1B3D2F\"\u003ePlateau ~30–40°C\u003c\/text\u003e\n\n\u003ctext x=\"70\" y=\"268\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e5\u003c\/text\u003e\n\u003ctext x=\"215\" y=\"268\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e15\u003c\/text\u003e\n\u003ctext x=\"360\" y=\"268\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e25\u003c\/text\u003e\n\u003ctext x=\"505\" y=\"268\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e35\u003c\/text\u003e\n\u003ctext x=\"650\" y=\"268\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e45\u003c\/text\u003e\n\u003ctext x=\"360\" y=\"290\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#3A4A40\"\u003eSoil temperature (°C)\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003cdiv class=\"drf-fig-cap\"\u003e\n\u003cstrong\u003eTemperature drives the rate.\u003c\/strong\u003e Germida and Janzen's review names soil temperature, water potential and aeration as the primary constraints on elemental-sulphur oxidation. Of the three, temperature is the one you cannot manage: the bacteria slow sharply as the soil cools, roughly a fourfold change in rate for every 10 °C (Chapman, 1996), and oxidation continues at low temperature but slowly. In practice that means spring-to-autumn application in UK gardens, where soils sit well below the optimum all year. \u003cem\u003eSources: Chapman, 1996; Germida \u0026amp; Janzen, 1993; Yang et al., 2010.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhy the bentonite is there\u003c\/h3\u003e\n\u003cdiv class=\"drf-fig\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eForm\u003c\/th\u003e\n\u003cth\u003eWhat reaches the soil\u003c\/th\u003e\n\u003cth\u003eHandling\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMilled powder\u003c\/td\u003e\n\u003ctd\u003eFine particles spread thinly — the most soil-exposed surface of any form\u003c\/td\u003e\n\u003ctd\u003eDusty, drifts on the wind, unpleasant to spread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSulphur-bentonite pastille — Dr Forest\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFine sulphur, released as a cluster where each pastille sat\u003c\/td\u003e\n\u003ctd\u003eSpreads clean and dust-free at a measured rate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlain granule\u003c\/td\u003e\n\u003ctd\u003eStays intact for months; only the outer surface is exposed\u003c\/td\u003e\n\u003ctd\u003eEasy to spread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoarse chips\u003c\/td\u003e\n\u003ctd\u003eCoarse throughout; weathers down over a season or more\u003c\/td\u003e\n\u003ctd\u003eClean, but hard to spread evenly at a measured rate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-fig-cap\"\u003e\n\u003cstrong\u003eSurface area is what governs the rate, and it is not the same as particle size in the bag.\u003c\/strong\u003e Sulphur is oxidised at the surface of each particle, so finer material oxidises faster: Chapman measured 51% of a 300-mesh sulphur oxidised in seven weeks at 14 °C against 18% of a 120-mesh grade. The bentonite's job is to carry that fine sulphur cleanly — the clay swells on wetting and breaks the pastille apart where it lands, with no dust and nothing lost between the bag and the bed. We will not claim it is as fast as powder, because it is not: Degryse and colleagues measured sulphur-bentonite granules oxidising roughly 33 times more slowly than sub-100 µm elemental sulphur, because much of the released sulphur stays clustered rather than in contact with soil. Powder is the faster form. What the pastille buys you is a measured, dust-free dose that lands where you aimed it — so allow a full season for the change to develop. \u003cem\u003eSources: Chapman, 1996; Degryse et al., 2016; Lee, Boswell \u0026amp; Watkinson, 1988.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHow far, how fast\u003c\/h3\u003e\n\u003cdiv class=\"drf-fig\"\u003e\n\u003csvg viewbox=\"0 0 680 330\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n\u003ctitle\u003eIllustrative soil pH response over time in warm versus cool soil\u003c\/title\u003e\n\u003cdesc\u003eAn illustration of pH falling from 7.0 towards the ericaceous target band, faster in warm soil than cool soil.\u003c\/desc\u003e\n\n\u003crect x=\"70\" y=\"160\" width=\"585\" height=\"120\" fill=\"#E8F0EB\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"648\" y=\"176\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#4a7a5e\"\u003eEricaceous target 5.0–6.0\u003c\/text\u003e\n\n\u003cline x1=\"70\" y1=\"40\" x2=\"70\" y2=\"280\" stroke=\"#d4cfc5\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003cline x1=\"70\" y1=\"280\" x2=\"655\" y2=\"280\" stroke=\"#d4cfc5\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\n\u003ctext x=\"62\" y=\"44\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e7.0\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"104\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e6.5\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"164\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e6.0\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"224\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e5.5\u003c\/text\u003e\n\u003ctext x=\"62\" y=\"284\" text-anchor=\"end\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e5.0\u003c\/text\u003e\n\u003ctext x=\"24\" y=\"160\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\" transform=\"rotate(-90 24 160)\"\u003eSoil pH\u003c\/text\u003e\n\n\u003cpolyline points=\"70,40 166.7,100 263.3,148 360,184 456.7,202 650,214\" fill=\"none\" stroke=\"#C5A55A\" stroke-width=\"2.5\"\u003e\u003c\/polyline\u003e\n\n\u003cpolyline points=\"70,40 166.7,58 263.3,88 360,118 456.7,142 650,172\" fill=\"none\" stroke=\"#1B3D2F\" stroke-width=\"2\" stroke-dasharray=\"6 4\"\u003e\u003c\/polyline\u003e\n\n\u003ctext x=\"70\" y=\"298\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e0\u003c\/text\u003e\n\u003ctext x=\"263.3\" y=\"298\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e2\u003c\/text\u003e\n\u003ctext x=\"456.7\" y=\"298\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e4\u003c\/text\u003e\n\u003ctext x=\"650\" y=\"298\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003e6\u003c\/text\u003e\n\u003ctext x=\"360\" y=\"318\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#3A4A40\"\u003eMonths after application\u003c\/text\u003e\n\n\u003cline x1=\"430\" y1=\"52\" x2=\"460\" y2=\"52\" stroke=\"#C5A55A\" stroke-width=\"2.5\"\u003e\u003c\/line\u003e\n\u003ctext x=\"465\" y=\"56\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003eWarm, moist soil\u003c\/text\u003e\n\u003cline x1=\"430\" y1=\"70\" x2=\"460\" y2=\"70\" stroke=\"#1B3D2F\" stroke-width=\"2\" stroke-dasharray=\"6 4\"\u003e\u003c\/line\u003e\n\u003ctext x=\"465\" y=\"74\" font-family=\"Jost,sans-serif\" font-size=\"11\" fill=\"#3A4A40\"\u003eCool \/ heavy soil\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003cdiv class=\"drf-fig-cap\"\u003e\n\u003cstrong\u003eIllustrative, not a guarantee.\u003c\/strong\u003e There is a short lag of several days while the sulphur-oxidising bacteria establish, then oxidation runs at a roughly constant rate per unit of exposed particle surface — so the pace eases later because the particles are shrinking, not because the bacteria tire. Warm, moist, well-worked soil moves within weeks; cool or heavy soil takes months. A large shift, such as neutral ground down to blueberry pH, takes one to two years whatever you do. Always re-test. \u003cem\u003ePattern after Watkinson \u0026amp; Blair, 1993; timescale after Longstroth, MSU Extension.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eThe mechanism, in short\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eTwo protons per atom\u003c\/h4\u003e\n\u003cp\u003eThe acidity is biological: each sulphur atom oxidised releases 2 H⁺ (Havlin et al., 1999). No bacteria, no acid.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003eTemperature leads\u003c\/h4\u003e\n\u003cp\u003eTemperature, moisture and aeration are the three primary constraints on oxidation. The rate falls roughly fourfold for every 10 °C the soil cools (Chapman, 1996), so autumn and winter applications act mainly from spring onward (Germida \u0026amp; Janzen, 1993; Yang et al., 2010).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eBentonite makes the surface area\u003c\/h4\u003e\n\u003cp\u003eThe clay takes up soil moisture and swells, breaking each pastille apart and releasing fine sulphur where it landed. Oxidation still depends on the surface actually exposed to the soil. It has to wet where it lands to do that — see How to Use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003eBuffering sets the dose\u003c\/h4\u003e\n\u003cp\u003eClay and organic matter resist pH change, so they need far more sulphur than sand (RHS; Michigan State University Extension).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eLong residual\u003c\/h4\u003e\n\u003cp\u003eOnce acidified, soil pH typically stays low for 5+ years — but keep testing (Ohio State Extension, AGF-507).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003eKeep it aerobic\u003c\/h4\u003e\n\u003cp\u003eIn waterlogged soil, sulphur turns to hydrogen sulphide instead of sulphate, which harms roots. Damp, not saturated (Michigan State University Extension).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003col\u003e\n\u003cli\u003eMullen R, Lentz E, Watson M (2016). \u003cem\u003eSoil Acidification: How to Lower Soil pH.\u003c\/em\u003e Ohio State University Extension, AGF-507.\u003c\/li\u003e\n\u003cli\u003eRoyal Horticultural Society. \u003cem\u003eAcidifying soil.\u003c\/em\u003e RHS Advice.\u003c\/li\u003e\n\u003cli\u003eGermida JJ, Janzen HH (1993). Factors affecting the oxidation of elemental sulfur in soils. \u003cem\u003eFertilizer Research\u003c\/em\u003e 35(1–2): 101–114. doi:10.1007\/BF00750224. (This journal is now published as \u003cem\u003eNutrient Cycling in Agroecosystems\u003c\/em\u003e.)\u003c\/li\u003e\n\u003cli\u003eWatkinson JH, Blair GJ (1993). Modelling the oxidation of elemental sulfur in soils. \u003cem\u003eFertilizer Research\u003c\/em\u003e 35: 115–126. doi:10.1007\/BF00750225\u003c\/li\u003e\n\u003cli\u003eLee A, Boswell CC, Watkinson JH (1988). Effect of particle size on the oxidation of elemental sulphur, thiobacilli numbers, soil sulphate, and its availability to pasture. \u003cem\u003eNew Zealand Journal of Agricultural Research\u003c\/em\u003e 31(2): 179–186. doi:10.1080\/00288233.1988.10417943\u003c\/li\u003e\n\u003cli\u003eYang Z-H, Stöven K, Haneklaus S, Singh BR, Schnug E (2010). Elemental sulfur oxidation by \u003cem\u003eThiobacillus\u003c\/em\u003e spp. and aerobic heterotrophic sulfur-oxidizing bacteria. \u003cem\u003ePedosphere\u003c\/em\u003e 20(1): 71–79.\u003c\/li\u003e\n\u003cli\u003eHavlin JL, Beaton JD, Tisdale SL, Nelson WL (1999). \u003cem\u003eSoil Fertility and Fertilizers: An Introduction to Nutrient Management,\u003c\/em\u003e 6th ed. Upper Saddle River, NJ: Prentice Hall.\u003c\/li\u003e\n\u003cli\u003eLongstroth M (n.d.). \u003cem\u003eLowering the Soil pH with Sulfur.\u003c\/em\u003e Michigan State University Extension.\u003c\/li\u003e\n\u003cli\u003eChapman SJ (1996). Powdered elemental sulphur: oxidation rate, temperature dependence and modelling. \u003cem\u003eNutrient Cycling in Agroecosystems\u003c\/em\u003e 47: 19–28. doi:10.1007\/BF01985715\u003c\/li\u003e\n\u003cli\u003eDegryse F, Ajiboye B, Baird R, da Silva RC, McLaughlin MJ (2016). Oxidation of elemental sulfur in granular fertilizers depends on the soil-exposed surface area. \u003cem\u003eSoil Science Society of America Journal\u003c\/em\u003e 80(2): 294–305. doi:10.2136\/sssaj2015.06.0237\u003c\/li\u003e\n\u003cli\u003eHanson E, Hancock J (1996). \u003cem\u003eManaging the Nutrition of Highbush Blueberry.\u003c\/em\u003e Michigan State University Extension, Bulletin E-2011.\u003c\/li\u003e\n\u003cli\u003eUniversity of Georgia CAES. \u003cem\u003eBackyard blueberry leaves can tell the tale of soil deficiencies and pH problems.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eCornell University. \u003cem\u003eBerry Diagnostic Tool — blueberries: iron deficiency.\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ============ HOW TO USE ============ --\u003e\n\u003cdiv id=\"drf-su-panel3\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow to use sulphur to lower soil pH\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eTest first, then go gently\u003c\/span\u003e\n\u003cp\u003eOnly acidify if your soil is neutral or alkaline — check with a pH kit. Drop a little vinegar on the soil first: if it fizzes, there's free lime or chalk and it can't realistically be acidified (RHS). Wear gloves, work in still air, and err on the side of too little — you can always add more.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHow much to use\u003c\/h3\u003e\n\u003cp\u003eEvery rate below comes from a published university or horticultural guide, named next to the number. All rates are grams of pastilles per square metre, mixed into the top 15 cm. Always test your soil pH first, and only treat soil that is above the pH your plants need.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSoil type\u003c\/th\u003e\n\u003cth\u003eTo lower pH by one unit\u003c\/th\u003e\n\u003cth\u003eHow to apply it\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSandy\u003c\/td\u003e\n\u003ctd\u003e55 g\/m²\u003c\/td\u003e\n\u003ctd\u003eOne dose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoam\u003c\/td\u003e\n\u003ctd\u003e110 g\/m²\u003c\/td\u003e\n\u003ctd\u003eTwo doses of 55 g\/m², 6 months apart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClay\u003c\/td\u003e\n\u003ctd\u003e175 g\/m²\u003c\/td\u003e\n\u003ctd\u003eThree doses of about 58 g\/m², 6 months apart\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eSources: Ohio State University; Purdue University Extension; University of California. For half a unit (for example pH 7.0 to 6.5), use half these amounts.\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNever more than \u003cstrong\u003e80 g\/m² in one dose\u003c\/strong\u003e on beds, and no more than \u003cstrong\u003e160 g\/m² a year on bare soil before planting\u003c\/strong\u003e, and at most \u003cstrong\u003e125 g\/m² a year on planted ground\u003c\/strong\u003e (University of California; University of Maine). Retest before each further dose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAbout the RHS figure.\u003c\/strong\u003e The RHS gives 150 g\/m² on sandy soil up to 300 g\/m² on clay (RHS). That is two to four times the university figures above, so treat it as the upper limit. The RHS itself advises several small additions over months rather than one large dose.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat you're aiming for\u003c\/h3\u003e\n\u003cdiv class=\"drf-fig\"\u003e\n\u003csvg viewbox=\"0 0 680 340\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n\u003ctitle\u003eTarget soil pH ranges by plant\u003c\/title\u003e\n\u003cdesc\u003eBlueberries and cranberries 4.5 to 5.5; rhododendron, azalea, pieris and summer heather 4.5 to 6.0; camellia 5.0 to 6.5; veg, top fruit and lawns 6.0 to 7.0.\u003c\/desc\u003e\n\n\u003crect x=\"312.1\" y=\"45\" width=\"137.2\" height=\"248\" fill=\"#C5A55A\" opacity=\"0.12\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"380\" y=\"40\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#8b6914\"\u003eEricaceous zone 5.0–6.0\u003c\/text\u003e\n\n\u003cline x1=\"586.4\" y1=\"45\" x2=\"586.4\" y2=\"293\" stroke=\"#4a7a5e\" stroke-width=\"1\" stroke-dasharray=\"4 4\"\u003e\u003c\/line\u003e\n\u003ctext x=\"586.4\" y=\"308\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#4a7a5e\"\u003eNeutral 7.0\u003c\/text\u003e\n\n\u003ctext x=\"12\" y=\"72\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#1B3D2F\"\u003eBlueberry\u003c\/text\u003e\n\u003crect x=\"243.6\" y=\"61\" width=\"137.1\" height=\"20\" fill=\"#1B3D2F\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"12\" y=\"117\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#1B3D2F\"\u003eCranberry\u003c\/text\u003e\n\u003crect x=\"243.6\" y=\"106\" width=\"137.1\" height=\"20\" fill=\"#1B3D2F\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"12\" y=\"162\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#1B3D2F\"\u003eRhododendron \/ azalea\u003c\/text\u003e\n\u003crect x=\"243.6\" y=\"151\" width=\"205.7\" height=\"20\" fill=\"#1B3D2F\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"12\" y=\"207\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#1B3D2F\"\u003ePieris \u0026amp; summer heather\u003c\/text\u003e\n\u003crect x=\"243.6\" y=\"196\" width=\"205.7\" height=\"20\" fill=\"#1B3D2F\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"12\" y=\"252\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#1B3D2F\"\u003eCamellia\u003c\/text\u003e\n\u003crect x=\"312.1\" y=\"241\" width=\"205.7\" height=\"20\" fill=\"#1B3D2F\"\u003e\u003c\/rect\u003e\n\u003ctext x=\"12\" y=\"285\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#3A4A40\"\u003eVeg, top fruit \u0026amp; lawns\u003c\/text\u003e\n\u003crect x=\"449.3\" y=\"274\" width=\"137.1\" height=\"16\" fill=\"#4a7a5e\"\u003e\u003c\/rect\u003e\n\n\u003cline x1=\"175\" y1=\"298\" x2=\"655\" y2=\"298\" stroke=\"#d4cfc5\" stroke-width=\"1\"\u003e\u003c\/line\u003e\n\u003ctext x=\"175\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e4.0\u003c\/text\u003e\n\u003ctext x=\"243.6\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e4.5\u003c\/text\u003e\n\u003ctext x=\"312.1\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e5.0\u003c\/text\u003e\n\u003ctext x=\"380.7\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e5.5\u003c\/text\u003e\n\u003ctext x=\"449.3\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e6.0\u003c\/text\u003e\n\u003ctext x=\"517.9\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e6.5\u003c\/text\u003e\n\u003ctext x=\"586.4\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e7.0\u003c\/text\u003e\n\u003ctext x=\"655\" y=\"316\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"10.5\" fill=\"#3A4A40\"\u003e7.5\u003c\/text\u003e\n\u003ctext x=\"415\" y=\"334\" text-anchor=\"middle\" font-family=\"Jost,sans-serif\" font-size=\"11.5\" fill=\"#3A4A40\"\u003eSoil pH\u003c\/text\u003e\n\u003c\/svg\u003e\n\u003cdiv class=\"drf-fig-cap\"\u003e\n\u003cstrong\u003eWhere to aim.\u003c\/strong\u003e Most ericaceous plants are happy at pH 5.0–6.0; blueberries and cranberries want it lower, around 4.5–5.5. Blueberries are the least forgiving: above about pH 5.3 they begin to show iron chlorosis, the youngest leaves going yellow while the veins stay dark green. That is more than a point below neutral, which is why blueberry ground almost always needs correcting. \u003cem\u003eSources: RHS; University of Georgia Extension; Cornell Berry Diagnostic Tool.\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003cth\u003eRate\u003c\/th\u003e\n\u003cth\u003eSource\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower pH 1 unit, sandy soil\u003c\/td\u003e\n\u003ctd\u003e55 g\/m²\u003c\/td\u003e\n\u003ctd\u003eOhio State, Purdue, University of California\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower pH 1 unit, loam\u003c\/td\u003e\n\u003ctd\u003e110 g\/m² (2 doses)\u003c\/td\u003e\n\u003ctd\u003ePurdue, University of California\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower pH 1 unit, clay\u003c\/td\u003e\n\u003ctd\u003e175 g\/m² (3 doses)\u003c\/td\u003e\n\u003ctd\u003eUniversity of California, Purdue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMost in one dose, beds\u003c\/td\u003e\n\u003ctd\u003e80 g\/m²\u003c\/td\u003e\n\u003ctd\u003eUniversity of California\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMost in one year, bare beds before planting\u003c\/td\u003e\n\u003ctd\u003e160 g\/m²\u003c\/td\u003e\n\u003ctd\u003eUniversity of California\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMost in one year, planted ground\u003c\/td\u003e\n\u003ctd\u003e125 g\/m²\u003c\/td\u003e\n\u003ctd\u003eUniversity of Maine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLawns (only if pH above 7.5)\u003c\/td\u003e\n\u003ctd\u003e15 g\/m² (about one level tablespoon), at most twice a year\u003c\/td\u003e\n\u003ctd\u003eUniversity of Georgia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEstablished ericaceous plants\u003c\/td\u003e\n\u003ctd\u003eup to 25 g\/m² a dose\u003c\/td\u003e\n\u003ctd\u003eUniversity of Georgia, Cornell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEstablished blueberries\u003c\/td\u003e\n\u003ctd\u003eup to 94 g per plant per year\u003c\/td\u003e\n\u003ctd\u003eOregon State, Cornell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePots\u003c\/td\u003e\n\u003ctd\u003eDo not use\u003c\/td\u003e\n\u003ctd\u003eRHS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eOpen ground \u0026amp; beds\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 55 g\/m² sandy, 110 g\/m² loam, 175 g\/m² clay, per pH unit  |  \u003cstrong\u003eWhen:\u003c\/strong\u003e spring to early autumn, ideally before planting\u003c\/div\u003e\n\u003cp\u003eMix the pastilles into the top 15 cm and water in. Left on the surface they can take years to work (RHS). Never more than 80 g\/m² in one dose or 160 g\/m² a year on bare soil before planting, or at most 125 g\/m² a year on planted ground (University of California; University of Maine). Wait at least 3 months, ideally 6, before retesting (University of California).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003ePots \u0026amp; containers\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e do not use\u003c\/div\u003e\n\u003cp\u003eThe RHS lists sulphur as suitable for all soils but not potting media (RHS). For acid lovers in pots, use ericaceous compost and water with rainwater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eEstablished ericaceous plants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e up to 25 g\/m² a dose  |  \u003cstrong\u003eWhen:\u003c\/strong\u003e at most twice a year, early spring and late autumn\u003c\/div\u003e\n\u003cp\u003eFor rhododendrons, azaleas, camellias and heathers already in the ground, sprinkle over the root area out to the edge of the leaves (University of Georgia), lightly work in and water. Split the year's amount between early spring and late autumn (Cornell University). Retest before repeating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawns\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15 g\/m² (about one level tablespoon), only where soil pH is above 7.5  |  \u003cstrong\u003eWhen:\u003c\/strong\u003e at most twice a year\u003c\/div\u003e\n\u003cp\u003eMost lawns are happy between pH 6.0 and 7.5 (Purdue University), so most lawns do not need sulphur. Only use it if a soil test shows pH above 7.5. Apply 15 g\/m² (about one level tablespoon), at most twice a year, as heavier doses can scorch grass. Water in straight away with about 10 litres per square metre. Apply in spring or early autumn on mown grass, not in hot weather or on dry, stressed grass (Kansas State University). Retest after the second dose. \u003cstrong\u003eSulphur does not control moss\u003c\/strong\u003e, and more acidic soil can make moss worse (RHS).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eBlueberries and other fruit\u003c\/h3\u003e\n\u003cp\u003eBlueberries need acid soil, ideally pH 4.5 to 5.5 (RHS). Most other fruit is happy at pH 6.0 to 7.0, so only use sulphur where a test shows the pH is above your crop's range.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBefore planting:\u003c\/strong\u003e use the soil-type rates above, mixed in to 15 to 20 cm, at least 6 months ahead (University of Georgia), ideally a year (Cornell University).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEstablished blueberries:\u003c\/strong\u003e no more than \u003cstrong\u003e94 g per plant per year\u003c\/strong\u003e (Oregon State University; Cornell University), either once in early autumn or split between early spring and late autumn, and never more than 25 g\/m² per dose over the root area (University of Georgia). Higher rates can burn or kill the plants (Cornell University).\u003c\/li\u003e\n\u003cli\u003eRetest every autumn (Oregon State University).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBrassicas and onions\u003c\/h3\u003e\n\u003cp\u003eDo not use Sulphur Pastilles to lower pH in brassica beds, which need pH 6.5 to 7.0 where clubroot is a problem. Where brassicas or onions are short of sulphur, use a sulphate fertiliser instead, which plants can take up straight away (AHDB RB209).\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eWhich bag size do you need?\u003c\/h3\u003e\n\u003cp\u003eSulphur is dosed by area, so the sum is simple: \u003cstrong\u003eyour area in m² × the rate for your soil = grams of product needed\u003c\/strong\u003e. A 6 m² border on loam needs 6 × 110 = 660 g to lower pH by one unit, given as two doses of 330 g, 6 months apart. Retest before each further dose.\u003c\/p\u003e\n\u003ch4\u003eArea each bag treats\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBag\u003c\/th\u003e\n\u003cth\u003eSandy (55 g\/m²)\u003c\/th\u003e\n\u003cth\u003eLoam (110 g\/m²)\u003c\/th\u003e\n\u003cth\u003eClay (175 g\/m²)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.5kg\u003c\/td\u003e\n\u003ctd\u003e27 m²\u003c\/td\u003e\n\u003ctd\u003e13.6 m²\u003c\/td\u003e\n\u003ctd\u003e8.6 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4kg\u003c\/td\u003e\n\u003ctd\u003e72 m²\u003c\/td\u003e\n\u003ctd\u003e36 m²\u003c\/td\u003e\n\u003ctd\u003e23 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9kg\u003c\/td\u003e\n\u003ctd\u003e163 m²\u003c\/td\u003e\n\u003ctd\u003e82 m²\u003c\/td\u003e\n\u003ctd\u003e51 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15kg\u003c\/td\u003e\n\u003ctd\u003e272 m²\u003c\/td\u003e\n\u003ctd\u003e136 m²\u003c\/td\u003e\n\u003ctd\u003e85 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eTo lower pH by one unit in the top 15 cm. Loam is treated in two doses and clay in three, 6 months apart, and beds never get more than 80 g\/m² in one dose or 160 g\/m² a year on bare soil before planting, or at most 125 g\/m² a year on planted ground (University of California; University of Maine). Retest before each further dose.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch4\u003eTypical projects\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eWhat you are doing\u003c\/th\u003e\n\u003cth\u003eOn loam (110 g\/m²)\u003c\/th\u003e\n\u003cth\u003eBag\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRhododendron border, 5 m × 1.5 m\u003c\/td\u003e\n\u003ctd\u003e825 g\u003c\/td\u003e\n\u003ctd\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNew ericaceous bed, 10 m²\u003c\/td\u003e\n\u003ctd\u003e1,100 g\u003c\/td\u003e\n\u003ctd\u003e1.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcid border or small blueberry patch, 25 m²\u003c\/td\u003e\n\u003ctd\u003e2,750 g\u003c\/td\u003e\n\u003ctd\u003e4kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLarge planting, 100 m²\u003c\/td\u003e\n\u003ctd\u003e11,000 g\u003c\/td\u003e\n\u003ctd\u003e15kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eOn clay, use about 60% more. On sand, use half. Split each total into doses as above.\u003c\/em\u003e\u003c\/p\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003ePots: do not use\u003c\/span\u003e\n\u003cp\u003eThe RHS lists sulphur as suitable for all soils but not potting media (RHS). For acid lovers in pots, use ericaceous compost and water with rainwater.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhere to buy sulphur for soil in the UK\u003c\/h3\u003e\n\u003cp\u003eGarden sulphur goes by several names — sulphur granules, sulphur pastilles, yellow sulphur, flowers of sulphur, soil acidifier, ericaceous soil conditioner. They are all elemental sulphur at different particle sizes, and what you are buying here is the sulphur-bentonite pastille form: 90% sulphur, spread dust-free.\u003c\/p\u003e\n\u003cp\u003eWe make and pack it ourselves in Stockport and ship across the UK, in 1.5kg, 4kg, 9kg and 15kg bags, so you can buy a small quantity or enough for a whole border without going to a wholesaler. Delivery is free on orders over £40. If you are weighing up sulphur against iron or aluminium sulphate, or against ericaceous compost, both comparisons are set out in the questions below.\u003c\/p\u003e\n\u003ch3\u003eStep by step\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest your soil.\u003c\/strong\u003e Take a pH reading and do the vinegar-fizz check for free lime.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWork out the rate.\u003c\/strong\u003e Use your soil type and how far you need to drop (table above).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeigh it out.\u003c\/strong\u003e Use kitchen scales rather than guessing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroadcast on the surface.\u003c\/strong\u003e Scatter evenly across the area. Do not bury the pastilles yet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater, and give it a few days.\u003c\/strong\u003e The bentonite swells and breaks each pastille into fine sulphur — you will see them slump and spread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNow fork it in.\u003c\/strong\u003e Work the dispersed sulphur into the top 15 cm and keep the soil damp. The bacteria need moisture and air, never waterlogged.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-test after 8–12 weeks.\u003c\/strong\u003e Top up cautiously if you're not there yet; it's easy to overshoot.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well alongside\u003c\/span\u003e\n\u003cp\u003eOnce the pH is right, feed acid-lovers gently. Our \u003ca href=\"https:\/\/www.drforest.co.uk\/products\/sulphate-of-potash\"\u003eSulphate of Potash\u003c\/a\u003e gives fruiting blueberries chloride-free potash, and \u003ca href=\"https:\/\/www.drforest.co.uk\/products\/organic-scottish-seaweed-kelp-meal-fertiliser\"\u003eSeaweed Plant Food\u003c\/a\u003e is a mild, pH-safe biostimulant. If you want sulphur and calcium \u003cem\u003ewithout\u003c\/em\u003e lowering pH, that's a job for gypsum — not this.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ============ FAQ ============ --\u003e\n\u003cdiv id=\"drf-su-panel4\" class=\"drf-panel\"\u003e\n\u003ch2\u003eSulphur soil acidifier — questions\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq1\" class=\"drf-faq-q\"\u003eWhat does sulphur do to soil?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSoil bacteria oxidise elemental sulphur into sulphuric acid, which lowers pH. That frees up iron and manganese for acid-loving plants and leaves behind sulphate, a plant nutrient. It only acidifies — it won't raise pH.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq2\" class=\"drf-faq-q\"\u003eHow long does it take to lower soil pH?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt depends how far you are going. A modest correction — say half a point to a point on ordinary garden soil — takes weeks in warm, moist ground and months if it is cold or heavy; RHS puts it at weeks, or months over winter. A large shift is a different proposition: Michigan State reckon on one to two years to bring neutral soil down to blueberry pH, and up to five years of annual applications if the plants are already in the ground. Apply spring to autumn, re-test after 8–12 weeks, and judge it on the meter rather than the calendar.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq3\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq3\" class=\"drf-faq-q\"\u003eHow much sulphur do I need?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eTo lower pH by one unit in the top 15 cm: sandy soil 55 g\/m², loam 110 g\/m² in two doses, clay 175 g\/m² in three doses (Ohio State University; Purdue University; University of California). Never more than 80 g\/m² in one dose or 160 g\/m² a year on bare soil before planting, or at most 125 g\/m² a year on planted ground (University of California; University of Maine). The RHS figure of 150 to 300 g\/m² is the upper limit. Retest before each further dose.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq4\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq4\" class=\"drf-faq-q\"\u003eWill it make soil acidic enough for blueberries?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes, but give it time. Blueberries want pH 4.5–5.5, and on neutral or clay soil that is a big shift — Michigan State put it at one to two years, not one season, and advise applying and incorporating at least a year before planting. For bushes already in the ground, they cap the rate and spread it across several years rather than dosing heavily in one go. Correct the ground first, test, then plant.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq5\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq5\" class=\"drf-faq-q\"\u003eCan I use it on established plants and in pots?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eEstablished plants, yes: up to 25 g\/m² a dose over the root area, at most twice a year (University of Georgia; Cornell University), and no more than 94 g per blueberry plant a year (Oregon State University). Pots, no: the RHS lists sulphur as unsuitable for potting media, so use ericaceous compost instead.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq6\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq6\" class=\"drf-faq-q\"\u003eSulphur, or iron \/ aluminium sulphate?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSulphur needs the least material and lasts for years, but it's slow, because soil bacteria make the acid. Iron and aluminium sulphates act faster, yet you need about 7–8× as much and they can tie up phosphorus, with aluminium building up over time (RHS).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq7\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq7\" class=\"drf-faq-q\"\u003eIs it safe for children, pets, bees and wildlife?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt's a natural mineral used widely in gardens, and the granules are low-dust. As with any soil product, wear gloves, keep it out of eyes, store it sealed and don't over-apply.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq8\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq8\" class=\"drf-faq-q\"\u003eIs it organic?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eTwo naturally occurring minerals and nothing else: elemental sulphur with 10% bentonite, a natural swelling clay that is there to break the pastille down in the soil. Both are used by organic gardeners. We don't make certified-organic claims.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq9\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq9\" class=\"drf-faq-q\"\u003eWhy isn't my soil pH changing?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eUsually one of three things: the soil is too cold, it's waterlogged (which turns sulphur to hydrogen sulphide instead of acid), or there's free lime or chalk buffering it. Do the vinegar-fizz test — if it fizzes, sulphur won't hold (RHS; Michigan State University Extension).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq10\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq10\" class=\"drf-faq-q\"\u003eWhere is it made?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eWeighed and packed by hand in small batches by Dr Forest in Stockport. The sulphur-bentonite pastilles are manufactured by co-melting the two minerals together, so what reaches you is exactly that and nothing else.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq12\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq12\" class=\"drf-faq-q\"\u003eWhy is there bentonite clay in it?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eTo break the pastille apart. Sulphur is oxidised on the surface of each particle, so fine sulphur works and lumps don't — but fine sulphur is dusty, drifts on the wind and is unpleasant to spread. Ten per cent bentonite solves both problems at once: the pastille handles like a granule, then the clay imbibes soil moisture, swells and bursts it into finely divided sulphur exactly where you put it. The bentonite itself does no harm — it is an inert clay mineral, and if anything it slightly improves the soil's ability to hold nutrients.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq11\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq11\" class=\"drf-faq-q\"\u003eIs this the same as sulphur chips or garden sulphur?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eSame mineral, different form. \"Garden sulphur\", \"yellow sulphur\" and \"sulphur chips\" usually mean plain elemental sulphur, which has to weather down before it does much. Ours is a sulphur-bentonite pastille — 90% sulphur, 10% clay — spread dust-free, then breaking itself into fine sulphur the moment it gets wet. The advantage is handling: a measured, dust-free dose that lands exactly where you aimed it.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq-paa1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq-paa1\" class=\"drf-faq-q\"\u003eWhen should I apply soil acidifier?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eFrom spring to autumn, ideally before planting. Bacteria do the work, so it acts fastest in warm, moist soil and stalls in cold or waterlogged ground.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq-paa2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq-paa2\" class=\"drf-faq-q\"\u003eHow do I apply it to beds?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eScatter it evenly over the surface and water it. Leave it a few days for the pastilles to swell and break down, then fork it into the top 15 cm. Don't bury the pastilles whole, because that concentrates the sulphur in one spot and slows the whole job down.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq-paa3\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq-paa3\" class=\"drf-faq-q\"\u003eIs Epsom salt a soil acidifier?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eNo. Magnesium sulphate is pH neutral, so it won't lower your pH. Use it only if your plants need magnesium. To acidify soil, you need elemental sulphur, which soil bacteria turn into acid.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-su-faq-paa4\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-su-faq-paa4\" class=\"drf-faq-q\"\u003eWhich plants is it for?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eAcid-loving plants. These include blueberries and cranberries (pH 4.5 to 5.5), rhododendrons, azaleas and camellias (pH 4.5 to 6.0), and acers, pieris and summer heathers. For brassicas and onions, use a sulphate instead.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"1.5kg","offer_id":58378201661814,"sku":"DF-SULPHUR-1.5","price":12.0,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":58378201694582,"sku":"DF-SULPHUR-4","price":24.25,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":58378201727350,"sku":"DF-SULPHUR-9","price":44.0,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":58378201760118,"sku":"DF-SULPHUR-15","price":66.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/sulphur2.png?v=1786553590"},{"product_id":"kieserite-magnesium-sulphate-fertiliser","title":"Kieserite | 25% MgO | Organic Magnesium Fertiliser","description":"\u003c!-- Dr Forest — Kieserite (Magnesium Sulphate Monohydrate) Shopify Product Page --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- Design System v1.0 · 4-tab layout · prefix \"ks\" · Shopify-safe, no JS --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-dark:   #0F2A1F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-cream:      #F5F2EC;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-muted:      #3A4A40;\n    --drf-white:      #FFFFFF;\n    --drf-border:     #d4cfc5;\n  }\n\n  \/* ── TYPOGRAPHY ── *\/\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.9em; color: var(--drf-grn-dark); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 500; font-size: 1.35em; color: var(--drf-grn-dark); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; font-weight: 500; font-size: 0.85em; letter-spacing: 0.18em; text-transform: uppercase; 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line-height: 1.1; display: block; }\n  .drf-stat-label { font-size: 0.6em; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--drf-gold); display: block; margin-top: 0.25em; }\n\n  \/* ── TABS ── *\/\n  .drf-tabs-wrap { max-width: 100%; overflow: hidden; }\n  .drf-tabs-wrap input[type=\"radio\"] { display: none; }\n  .drf-tab-labels { display: flex; align-items: stretch; border-bottom: 2px solid var(--drf-border); margin-bottom: 1.2em; }\n  .drf-tab-labels label { flex: 1 1 0; padding: 0.75em 0.4em; font-size: 0.82em; font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; color: #8b6914; background: var(--drf-gold-light); cursor: pointer; text-align: center; display: flex; align-items: center; justify-content: center; border-bottom: 3px solid var(--drf-gold); margin-bottom: -2px; transition: all 0.15s; }\n  .drf-tab-labels label:hover { color: var(--drf-grn-dark); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn-dark); }\n  .drf-panel { display: none; }\n  #drf-ks-tab1:checked ~ .drf-tab-labels label[for=\"drf-ks-tab1\"],\n  #drf-ks-tab2:checked ~ .drf-tab-labels label[for=\"drf-ks-tab2\"],\n  #drf-ks-tab3:checked ~ .drf-tab-labels label[for=\"drf-ks-tab3\"],\n  #drf-ks-tab4:checked ~ .drf-tab-labels label[for=\"drf-ks-tab4\"] { color: var(--drf-grn-dark); background: var(--drf-grn-light); border-bottom-color: var(--drf-grn-dark); font-weight: 600; }\n  #drf-ks-tab1:checked ~ .drf-panels #drf-ks-panel1,\n  #drf-ks-tab2:checked ~ .drf-panels #drf-ks-panel2,\n  #drf-ks-tab3:checked ~ .drf-panels #drf-ks-panel3,\n  #drf-ks-tab4:checked ~ .drf-panels #drf-ks-panel4 { display: block; }\n\n  \/* ── CALLOUTS ── *\/\n  .drf-callout { background: var(--drf-grn-light); border-left: 3px solid var(--drf-grn); padding: 1em 1.2em; margin: 1.2em 0; border-radius: 0; }\n  .drf-callout-gold { background: var(--drf-gold-light); border-left-color: var(--drf-gold); }\n  .drf-callout p:last-child { margin-bottom: 0; }\n  .drf-callout-title { font-size: 0.72em; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--drf-grn); margin-bottom: 0.4em; display: block; }\n  .drf-callout-gold .drf-callout-title { color: var(--drf-gold); }\n  .drf-callout-dark { background: var(--drf-grn-dark); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 1.2em 0; border-radius: 0; color: var(--drf-cream); }\n  .drf-callout-dark p { color: var(--drf-cream); margin-bottom: 0.9em; }\n  .drf-callout-dark p:last-child { margin-bottom: 0; }\n  .drf-callout-dark strong { color: var(--drf-gold); font-weight: 500; }\n  .drf-callout-dark a { color: var(--drf-gold); }\n  .drf-callout-dark .drf-callout-title { font-size: 0.72em; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--drf-gold); margin-bottom: 0.4em; display: block; }\n\n  \/* ── MECHANISM CARDS ── *\/\n  .drf-mech { border: 1px solid var(--drf-border); border-left: 3px solid var(--drf-gold); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 0; background: var(--drf-grn-light); }\n  .drf-mech-num { font-family: 'Cormorant Garamond', serif; font-size: 2em; font-weight: 400; color: var(--drf-gold); line-height: 1; }\n  .drf-mech h4 { margin-top: 0.2em; color: var(--drf-grn-dark); text-transform: none; letter-spacing: 0; font-size: 1em; }\n  .drf-mech p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n\n  \/* ── RATE CARDS ── *\/\n  .drf-rate { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin: 0.8em 0; border-radius: 0; background: var(--drf-grn-light); }\n  .drf-rate h4 { margin-top: 0; color: var(--drf-grn-dark); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 500; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.5em; margin-bottom: 0.6em; }\n  .drf-rate-meta { font-size: 0.85em; color: var(--drf-muted); margin-bottom: 0.5em; }\n  .drf-rate-meta strong { color: var(--drf-gold); }\n  .drf-rate p { font-size: 0.92em; color: var(--drf-muted); margin-bottom: 0; }\n  .drf-rate-cite { display: block; font-size: 0.78em; color: #6b7a70; font-style: italic; margin-top: 0.5em; }\n\n  \/* ── NUMBERED STEPS ── *\/\n  .drf-steps { counter-reset: drf-step; list-style: none; padding: 0; }\n  .drf-steps li { counter-increment: drf-step; padding: 0.8em 0 0.8em 3em; position: relative; border-bottom: 1px solid #eee; }\n  .drf-steps li::before { content: counter(drf-step); position: absolute; left: 0; top: 0.8em; width: 2em; height: 2em; border-radius: 0; background: var(--drf-grn-dark); color: #fff; font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 0.9em; display: flex; align-items: center; justify-content: center; }\n  .drf-steps li:last-child { border-bottom: none; }\n\n  \/* ── USE-CASE LIST ── *\/\n  .drf-uses { list-style: none; padding: 0; }\n  .drf-uses li { padding: 0.6em 0; border-bottom: 1px solid var(--drf-gold); }\n  .drf-uses li:nth-child(even) { border-bottom-color: var(--drf-grn); }\n  .drf-uses li:last-child { border-bottom: none; }\n  .drf-uses li strong { color: var(--drf-grn-dark); }\n\n  \/* ── COMPARISON BOXES ── *\/\n  .drf-compare { margin: 1.2em 0; }\n  .drf-compare-box { border: 1px solid var(--drf-border); padding: 1em 1.2em; margin-bottom: 0.8em; border-radius: 0; background: var(--drf-grn-light); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn-dark); text-transform: none; letter-spacing: 0; font-size: 1.05em; font-family: 'Cormorant Garamond', serif; font-weight: 500; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* ── FAQ ACCORDIONS ── *\/\n  .drf-faq { border-bottom: 1px solid var(--drf-border); }\n  .drf-faq:last-child { border-bottom: none; }\n  .drf-faq input[type=\"checkbox\"] { display: none; }\n  .drf-faq-q { display: flex; justify-content: space-between; align-items: center; padding: 0.8em 0; cursor: pointer; font-weight: 500; color: var(--drf-grn-dark); font-size: 0.95em; }\n  .drf-faq-q::after { content: '+'; font-size: 1.2em; font-weight: 300; color: var(--drf-gold); width: 1.5em; height: 1.5em; border-radius: 0; border: 1px solid var(--drf-gold); background: var(--drf-white); display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-left: 0.6em; }\n  .drf-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; font-size: 0.92em; color: var(--drf-muted); line-height: 1.7; }\n  .drf-faq-a \u003e div { padding: 0 0 1em; }\n  .drf-faq input:checked ~ .drf-faq-h .drf-faq-q::after { content: '\\2212'; background: var(--drf-grn-dark); color: #fff; border-color: var(--drf-grn-dark); }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 900px; }\n\n  \/* ── REFERENCES ── *\/\n  .drf-refs { font-size: 0.78em; color: #6b7a70; line-height: 1.5; margin-top: 1.5em; padding-top: 0.8em; border-top: 1px solid var(--drf-border); }\n  .drf-refs ol { padding-left: 1.4em; margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n\n  \/* ── TABLES ── *\/\n  .drf-wrap table { width: 100%; border-collapse: collapse; margin: 1em 0; font-size: 0.92em; }\n  .drf-wrap table th { background: var(--drf-grn-dark); color: #fff; padding: 0.6em 0.8em; text-align: left; font-weight: 500; font-size: 0.85em; letter-spacing: 0.06em; text-transform: uppercase; }\n  .drf-wrap table td { padding: 0.5em 0.8em; border-bottom: 1px solid var(--drf-border); }\n  .drf-wrap table tr:nth-child(even) td { background: #f2f7f3; }\n.drf-faq-h{margin:0;padding:0;border:0;font:inherit;line-height:inherit;letter-spacing:inherit;text-transform:none;color:inherit}\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput type=\"radio\" name=\"drf-ks-tabset\" id=\"drf-ks-tab1\" checked\u003e \u003cinput type=\"radio\" name=\"drf-ks-tabset\" id=\"drf-ks-tab2\"\u003e \u003cinput type=\"radio\" name=\"drf-ks-tabset\" id=\"drf-ks-tab3\"\u003e \u003cinput type=\"radio\" name=\"drf-ks-tabset\" id=\"drf-ks-tab4\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-ks-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-ks-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-ks-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-ks-tab4\"\u003eFAQ\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-panels\"\u003e\n\u003c!-- ═══════════ TAB 1: OVERVIEW ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-ks-panel1\"\u003e\n\u003ch2\u003eKieserite fertiliser — water-soluble magnesium and sulphur for plants\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003e25% MgO · 50% SO₃\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eFor Plants \u0026amp; Soil\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003epH Neutral\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eChloride Free\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eFully Water-Soluble\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-gold\"\u003eSingle Ingredient\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eKieserite is naturally occurring magnesium sulphate monohydrate (MgSO₄·H₂O), a mined mineral supplying 25% MgO and 50% SO₃ in the sulphate form plant roots absorb directly.\u003c\/strong\u003e It is fully water-soluble at around 393 g per litre, so the magnesium is available to the plant as soon as the granules wet — no waiting on soil acidity, soil bacteria or a pH change to unlock it. That is the difference that matters, because the cheap alternatives are barely soluble at all. Dr Forest supplies it as a single-ingredient granule: one mineral, nothing blended in, nothing added.\u003c\/p\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eGarden use only\u003c\/span\u003e\n\u003cp\u003eThis is a garden fertiliser for plants and soil. It is not a human supplement, not a bath salt, and not food grade. Do not ingest. If you want a magnesium supplement or Epsom bathing salts, this is the wrong product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eAgainst Epsom salts the difference is concentration and format, not speed. Both are soluble sulphates and both act fast. Kieserite is the monohydrate at 15% magnesium; Epsom salt is the heptahydrate at 9.8%, so you carry and spread noticeably less product for the same dose. Kieserite comes as a granule you broadcast over soil, where Epsom salt is a fine crystal that suits being dissolved and sprayed. Use Epsom on the leaf, kieserite on the ground.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e25%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMgO\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e50%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSO₃\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e393 g\/L\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSolubility\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e0%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eChloride\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat gardeners use kieserite for\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterveinal yellowing\u003c\/strong\u003e — yellow between the veins on older, lower leaves while the veins stay green. The signature magnesium deficiency in tomatoes, roses, apples and vines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTomatoes in growing bags and borders\u003c\/strong\u003e — heavy potash feeding suppresses magnesium uptake. Kieserite restores the balance without adding more potassium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotatoes\u003c\/strong\u003e — one of the most magnesium-hungry crops on the allotment, and among the first to show it in the haulm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoses and flowering shrubs\u003c\/strong\u003e — magnesium sits at the centre of every chlorophyll molecule, so leaf colour and flower quality both depend on it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop fruit and soft fruit\u003c\/strong\u003e — apples, pears, currants and raspberries on light soils lose magnesium to leaching over winter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEricaceous plants\u003c\/strong\u003e — rhododendron, camellia, azalea and blueberry need magnesium but cannot take dolomitic lime, which would push the pH up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLawns\u003c\/strong\u003e — magnesium deepens the green without forcing the soft, disease-prone growth a nitrogen-only feed gives you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSulphur correction\u003c\/strong\u003e — UK soils have received far less atmospheric sulphur since coal burning declined. Brassicas, onions and leeks notice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-limed beds\u003c\/strong\u003e — excess calcium suppresses magnesium uptake. Kieserite corrects it without raising pH further.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo-dig beds\u003c\/strong\u003e — broadcast over the mulch and water in. No cultivation needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKieserite compared with the alternatives\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eKieserite granules — soluble sulphate, soil-applied\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e15% magnesium, half as much again per kilo as Epsom salt\u003c\/li\u003e\n\u003cli\u003e393 g\/L soluble, so the magnesium is available as soon as it wets\u003c\/li\u003e\n\u003cli\u003eWorks at any soil pH, including ericaceous beds and acid-loving fruit\u003c\/li\u003e\n\u003cli\u003eCarries 20% sulphur alongside the magnesium\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eEpsom salts — soluble sulphate, foliar-first\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e9.8% magnesium, so you spread more product for the same dose\u003c\/li\u003e\n\u003cli\u003e710 g\/L soluble — also fast, and better suited to a spray tank\u003c\/li\u003e\n\u003cli\u003eFine crystal rather than a granule, so it spreads less evenly on soil\u003c\/li\u003e\n\u003cli\u003eThe right tool for a foliar correction on a plant already yellowing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eMagnesium oxide and dolomitic lime — barely soluble\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMagnesium oxide dissolves at 0.006 g\/L, dolomite little better\u003c\/li\u003e\n\u003cli\u003eReleases only as soil acid attacks it, so it stalls at pH 7 and above\u003c\/li\u003e\n\u003cli\u003eDolomite raises pH, ruling it out on blueberries, azaleas and camellias\u003c\/li\u003e\n\u003cli\u003eMonths to respond, and often no response at all on alkaline ground\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-pullquote\"\u003eMagnesium sits at the centre of the chlorophyll molecule. Take it away and the leaf cannot build sugar, however much nitrogen you feed it.\u003c\/div\u003e\n\u003ch3\u003eTypical analysis\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium oxide (MgO)\u003c\/td\u003e\n\u003ctd\u003e25%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium (elemental Mg)\u003c\/td\u003e\n\u003ctd\u003e15%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulphur trioxide (SO₃)\u003c\/td\u003e\n\u003ctd\u003e50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulphur (elemental S)\u003c\/td\u003e\n\u003ctd\u003e20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChloride\u003c\/td\u003e\n\u003ctd\u003eNil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolubility in water\u003c\/td\u003e\n\u003ctd\u003eApprox. 393 g\/L — fully soluble\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH in solution\u003c\/td\u003e\n\u003ctd\u003eApprox. 7.0 (neutral)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm\u003c\/td\u003e\n\u003ctd\u003eGranular, magnesium sulphate monohydrate MgSO₄·H₂O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIngredients\u003c\/td\u003e\n\u003ctd\u003eKieserite. Nothing else.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eOne ingredient, screened and graded, nothing added. Safe around children, pets and bees once watered in. \u003cem\u003eMade by Growers. Backed by Science.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 2: THE SCIENCE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-ks-panel2\"\u003e\n\u003ch2\u003eWhy magnesium is the nutrient most UK gardens are quietly short of\u003c\/h2\u003e\n\u003ch3\u003eThe chlorophyll problem\u003c\/h3\u003e\n\u003cp\u003eEvery chlorophyll molecule holds a single magnesium ion at its centre. Between 15 and 35% of the magnesium in a leaf is committed to chlorophyll; the rest activates enzymes and stabilises ribosomes in the cytoplasm (Marschner, 2012). When supply runs short, the plant strips magnesium out of its oldest leaves and moves it to the growing tip. That is why deficiency shows as yellowing between the veins on the \u003cem\u003elower\u003c\/em\u003e leaves first while new growth still looks healthy.\u003c\/p\u003e\n\u003cp\u003eThe damage starts before the yellowing does. Cakmak and Kirkby (2008) showed that magnesium shortage blocks sugar export from the leaf well before any visible symptom appears. Sugars accumulate, photosynthesis backs up, and surplus light energy generates reactive oxygen species that bleach the tissue. A plant can be losing yield for weeks while still looking green.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eHow magnesium behaves in soil\u003c\/h3\u003e\n\u003cp\u003eMagnesium is a divalent cation held on clay and organic matter, but it binds more weakly than calcium and carries a larger hydration shell, so it sits further from the exchange surface. Gransee and Führs (2013) identify this as the reason magnesium leaches more readily than any other major cation. On sandy or free-draining ground, a wet UK winter strips a meaningful fraction of exchangeable magnesium out of the root zone.\u003c\/p\u003e\n\u003cp\u003eUptake is competitive too. Potassium, calcium and ammonium all compete with magnesium at the root surface, and high concentrations of any of them suppress it (Senbayram et al., 2015). This is the trap most tomato growers fall into: a summer of high-potash liquid feed drives magnesium deficiency in a soil that has plenty of magnesium in it.\u003c\/p\u003e\n\u003ch3\u003eMechanisms of action\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eChlorophyll assembly\u003c\/h4\u003e\n\u003cp\u003eMagnesium chelatase inserts magnesium into the protoporphyrin ring, the committed step of chlorophyll biosynthesis. Without enough magnesium the pathway stalls and the leaf cannot build the pigment, no matter how much nitrogen is available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\n\u003ch4\u003ePhloem loading and sugar export\u003c\/h4\u003e\n\u003cp\u003eSucrose export runs on a proton gradient maintained by magnesium-activated H⁺-ATPase. Cakmak and Kirkby (2008) showed magnesium-deficient plants accumulating carbohydrate in the source leaf while roots and fruit are starved. Roots shrink first, which then worsens uptake of everything else.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\n\u003ch4\u003eEnzyme activation and ATP\u003c\/h4\u003e\n\u003cp\u003eATP is biologically active as the Mg-ATP complex. Every kinase, every phosphatase, every ATP-spending step of the Calvin cycle needs magnesium as the counter-ion. Tränkner et al. (2018) place magnesium alongside potassium as a co-limiting factor for photosynthetic efficiency for exactly this reason.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\n\u003ch4\u003ePhotoprotection\u003c\/h4\u003e\n\u003cp\u003eA leaf that cannot export sugar still absorbs light. The surplus energy produces reactive oxygen species, and magnesium-deficient leaves are markedly more prone to photooxidative damage in high light. Greenhouse tomatoes and south-facing rose beds show symptoms first in a bright summer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\n\u003ch4\u003eSulphate for protein synthesis\u003c\/h4\u003e\n\u003cp\u003eThe 20% sulphur arrives already as sulphate, the form roots absorb. Sulphur builds cysteine and methionine, and sits at the heart of the glucosinolates that give brassicas and alliums their flavour and pungency. Guo et al. (2016) note that magnesium and sulphur deficiency now frequently occur together in intensively cropped soils.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\n\u003ch4\u003eSolubility decides everything\u003c\/h4\u003e\n\u003cp\u003eOnly water-soluble magnesium can be absorbed directly by the root. Kieserite dissolves at roughly 393 g\/L; magnesium oxide manages 0.006 g\/L and magnesium carbonate 0.106 g\/L. That is a gap of four to five orders of magnitude, and it is why a bag of magnesium oxide can sit in a neutral soil for a season and do almost nothing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eKieserite against magnesium oxide\u003c\/h3\u003e\n\u003cp\u003eOrlovius and McHoul (2015) compared kieserite with magnesium oxide on potato and sugar beet across multiple sites. Kieserite gave consistently higher leaf magnesium concentrations, because sulphate magnesium is available to the plant straight away while oxide and carbonate forms depend on soil acidity to release them. On neutral or alkaline ground the oxide barely moves at all.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnesium source\u003c\/th\u003e\n\u003cth\u003eCompound\u003c\/th\u003e\n\u003cth\u003eSolubility in water\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEpsom salt\u003c\/td\u003e\n\u003ctd\u003eMgSO₄·7H₂O\u003c\/td\u003e\n\u003ctd\u003e710 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKieserite\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMgSO₄·H₂O\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e393 g\/L\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium carbonate\u003c\/td\u003e\n\u003ctd\u003eMgCO₃\u003c\/td\u003e\n\u003ctd\u003e0.106 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium hydroxide\u003c\/td\u003e\n\u003ctd\u003eMg(OH)₂\u003c\/td\u003e\n\u003ctd\u003e0.009 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium oxide\u003c\/td\u003e\n\u003ctd\u003eMgO\u003c\/td\u003e\n\u003ctd\u003e0.006 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eBoth sulphates are fast. Everything below them on that table is effectively locked up until the soil is acid enough to dissolve it, which is why a magnesium problem on a chalky or limed garden does not respond to dolomite at all.\u003c\/p\u003e\n\u003ch3\u003eWhere magnesium fits with calcium\u003c\/h3\u003e\n\u003cp\u003eMagnesium and calcium compete, so correcting one without thinking about the other creates the opposite problem. On a heavy soil that needs both, pair kieserite with \u003ca href=\"\/products\/granulated-gypsum-clay-breaker\"\u003egranulated gypsum\u003c\/a\u003e — calcium sulphate supplies calcium and sulphur without shifting pH, which lets you lift both cations while keeping the ratio sane. The historic 5:1 calcium-to-magnesium \"ideal ratio\" from the Albrecht school has not held up: Kopittke and Menzies (2007) reviewed the evidence and found no consistent yield benefit from targeting a fixed ratio. Feed to the deficiency, not to a ratio.\u003c\/p\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific references\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eCakmak, I. \u0026amp; Kirkby, E.A. (2008). Role of magnesium in carbon partitioning and alleviating photooxidative damage. \u003cem\u003ePhysiologia Plantarum\u003c\/em\u003e, 133(4), 692–704.\u003c\/li\u003e\n\u003cli\u003eGransee, A. \u0026amp; Führs, H. (2013). Magnesium mobility in soils as a challenge for soil and plant analysis, magnesium fertilization and root uptake under adverse growth conditions. \u003cem\u003ePlant and Soil\u003c\/em\u003e, 368, 5–21.\u003c\/li\u003e\n\u003cli\u003eSenbayram, M., Gransee, A., Wahle, V. \u0026amp; Thiel, H. (2015). Role of magnesium fertilisers in agriculture: plant–soil continuum. \u003cem\u003eCrop and Pasture Science\u003c\/em\u003e, 66(12), 1219–1229.\u003c\/li\u003e\n\u003cli\u003eGuo, W., Nazim, H., Liang, Z. \u0026amp; Yang, D. (2016). Magnesium deficiency in plants: an urgent problem. \u003cem\u003eThe Crop Journal\u003c\/em\u003e, 4(2), 83–91.\u003c\/li\u003e\n\u003cli\u003eTränkner, M., Tavakol, E. \u0026amp; Jákli, B. (2018). Functioning of potassium and magnesium in photosynthesis, photosynthate translocation and photoprotection. \u003cem\u003ePhysiologia Plantarum\u003c\/em\u003e, 163(3), 414–431.\u003c\/li\u003e\n\u003cli\u003eHermans, C. \u0026amp; Verbruggen, N. (2005). Physiological characterization of Mg deficiency in \u003cem\u003eArabidopsis thaliana\u003c\/em\u003e. \u003cem\u003eJournal of Experimental Botany\u003c\/em\u003e, 56(418), 2153–2161.\u003c\/li\u003e\n\u003cli\u003eGrzebisz, W. (2013). Crop response to magnesium fertilization as affected by nitrogen supply. \u003cem\u003ePlant and Soil\u003c\/em\u003e, 368, 23–39.\u003c\/li\u003e\n\u003cli\u003eOrlovius, K. \u0026amp; McHoul, J. (2015). Effect of two magnesium fertilizers on leaf magnesium concentration, yield, and quality of potato and sugar beet. \u003cem\u003eJournal of Plant Nutrition\u003c\/em\u003e, 38(13), 2044–2054.\u003c\/li\u003e\n\u003cli\u003eKopittke, P.M. \u0026amp; Menzies, N.W. (2007). A review of the use of the basic cation saturation ratio and the \"ideal\" soil. \u003cem\u003eSoil Science Society of America Journal\u003c\/em\u003e, 71(2), 259–265.\u003c\/li\u003e\n\u003cli\u003eDadebo, M.M., Tan, Q., Wu, S., Sun, X., Li, M., Hashem, I.A. \u0026amp; Hu, C. (2026). Foliar magnesium application enhances fruit external and interior quality and nitrogen use efficiency of tomato under high nitrogen supply. \u003cem\u003eAgronomy\u003c\/em\u003e, 16(13), 1218.\u003c\/li\u003e\n\u003cli\u003eBai, R., Liu, H., Liu, Y. \u0026amp; Yong, J.W.H. (2024). Effects of foliar application of magnesium fertilizer on photosynthesis and growth in grapes. \u003cem\u003eAgronomy\u003c\/em\u003e, 14(11), 2659.\u003c\/li\u003e\n\u003cli\u003eShaddox, T. \u0026amp; Munshaw, G. (2019). \u003cem\u003eMagnesium for Kentucky turfgrasses\u003c\/em\u003e. University of Kentucky Cooperative Extension Service, AGR-243.\u003c\/li\u003e\n\u003cli\u003eMarschner, P. (ed.) (2012). \u003cem\u003eMarschner's Mineral Nutrition of Higher Plants\u003c\/em\u003e, 3rd edition. Academic Press, London.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 3: HOW TO USE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-ks-panel3\"\u003e\n\u003ch2\u003eHow to use kieserite — directions for use by crop\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eMeasuring and moisture\u003c\/span\u003e\n\u003cp\u003eA level tablespoon holds roughly 15 g, a level teaspoon about 5 g. Kieserite needs soil moisture to dissolve, so scatter it on damp ground and water it in, or apply just before rain. Broadcast onto bone-dry soil in July it will sit on the surface doing nothing until the weather breaks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eMore is not better\u003c\/span\u003e\n\u003cp\u003eMagnesium competes with calcium and potassium at the root. Overloading a soil with magnesium suppresses calcium uptake, which brings blossom end rot in tomatoes and bitter pit in apples, and it degrades the crumb structure of clay soils. \u003cstrong\u003eDo not exceed 30 g per square metre in a season\u003c\/strong\u003e, and skip the application entirely if a soil test shows a Magnesium Index of 3 or above. If leaves are yellow but the veins are yellow too, the problem is nitrogen or iron, not magnesium.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates by crop\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eTomatoes, peppers and aubergines\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 20 g\/m² before planting  |  \u003cstrong\u003eTop-up:\u003c\/strong\u003e 10 g\/m² at first truss\u003c\/div\u003e\n\u003cp\u003eThe classic case. A summer of high-potash tomato feed suppresses magnesium uptake and the lower leaves yellow between the veins by midsummer. Work 20 g\/m² into border soil before planting, then scatter a second 10 g\/m² and water it in as the first truss sets. In pots and growing bags, mix 3–5 g per 10 litres of compost before planting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003ePotatoes\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 25–30 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e In the trench at planting\u003c\/div\u003e\n\u003cp\u003ePotatoes remove more magnesium than almost anything else on the plot, and the haulm shows it early: interveinal yellowing on lower leaves spreading upward as tubers bulk. Scatter along the trench and cover. Use the upper end of the range on light sandy soils.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eRate scaled from field trials on potato and sugar beet, Orlovius \u0026amp; McHoul (2015), J. Plant Nutrition 38(13): 2044–2054.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRoses and flowering shrubs\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 20 g\/m² in spring  |  \u003cstrong\u003eSecond dose:\u003c\/strong\u003e 15 g\/m² after the first flush\u003c\/div\u003e\n\u003cp\u003eApply in March as growth breaks, spread across the root zone rather than at the stem, and water in. A second dose after the first flush carries colour through the later blooms. Roses on chalk or heavily limed beds respond particularly well, because the excess calcium has been suppressing magnesium uptake.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eApples, pears and top fruit\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 25 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Late winter to early spring, annually\u003c\/div\u003e\n\u003cp\u003eSpread evenly under the canopy out to the drip line, never in a ring at the trunk. Magnesium deficiency in apples shows as interveinal yellowing followed by early leaf drop from the base of the shoot, and it is worse in a heavy cropping year. Repeat annually on sandy orchard soils.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eStrawberries, raspberries and currants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15–20 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Early spring, before flowering\u003c\/div\u003e\n\u003cp\u003eSoft fruit on light soil loses magnesium over winter. Apply along the row in March and water in. For strawberries, apply after cutting back old foliage rather than during fruiting. Blackcurrants are especially prone and benefit from the sulphur as well.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eBrassicas, onions and leeks\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Worked in before planting out\u003c\/div\u003e\n\u003cp\u003eThis group is fed as much for the sulphur as the magnesium. Sulphur builds the compounds responsible for flavour and pungency in cabbage, sprouts, onions and leeks. Rake into the top 10 cm of the bed a week or two before transplanting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eGrapes and vines\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 20–25 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Early spring, before bud break\u003c\/div\u003e\n\u003cp\u003eMagnesium deficiency in vines is common and unmistakable: yellowing between the veins on basal leaves, often with a reddish margin on dark varieties, worsening as bunches fill. Apply around the base out to the spread of the canopy and water in well.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRhododendron, camellia, azalea and blueberry\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Spring, once a year\u003c\/div\u003e\n\u003cp\u003eThese plants need magnesium but cannot tolerate the pH lift from dolomitic lime, which makes kieserite the sensible route for ericaceous beds. Scatter over the mulch, water in, and top the mulch back up.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawns — dry granules\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15–20 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Spring or early autumn\u003c\/div\u003e\n\u003cp\u003eMagnesium deepens turf colour without forcing the lush, soft growth a straight nitrogen feed produces. Apply to damp grass on a still day, \u003cem\u003ewater in properly\u003c\/em\u003e, and leave the mower for two or three days. Granules left sitting dry on turf in sun can mark the leaf. Useful on sandy lawns that have been sanded and top-dressed repeatedly, where magnesium leaches out fastest. Turf research puts the useful range at 0.5–1 lb magnesium per 1,000 sq ft, which works out at 16–32 g\/m² of kieserite; stay at the lower end unless a soil test has confirmed a shortage, and never exceed 30 g\/m² in a season.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eShaddox \u0026amp; Munshaw (2019), Magnesium for Kentucky turfgrasses, University of Kentucky Cooperative Extension AGR-243.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eLawns — liquid feed\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eLight top-up:\u003c\/strong\u003e 3 g\/L at 1 L\/m², every 3–4 weeks  |  \u003cstrong\u003eFull correction:\u003c\/strong\u003e 3–4 g\/L at 5 L\/m², once in spring\u003c\/div\u003e\n\u003cp\u003eLiquid suits turf better than most things, because you cannot rake granules into an established lawn and anything left on the surface has to wait for rain. Dissolve, strain, and apply through a watering can with a fine rose or a hose-end feeder, then water the lawn afterwards to move it off the leaf and into the root zone.\u003c\/p\u003e\n\u003cp\u003eThe light top-up delivers about 3 g\/m² a pass and matches the foliar rate in the turf literature. Published turf foliar guidance is written for low-volume professional sprayers and works out near 79 g\/L, which will scorch a domestic lawn applied through a can — the rates here deliver the same magnesium per square metre at a concentration turf tolerates. Do not go above 13 g\/L on grass.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eConverted from Shaddox \u0026amp; Munshaw (2019), AGR-243 — foliar 0.1 lb Mg per 1,000 sq ft.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eMagnesium is not the lawn greener you may be thinking of\u003c\/span\u003e\n\u003cp\u003eThe product that turns a lawn dark green within days and blackens moss is \u003cstrong\u003eiron sulphate\u003c\/strong\u003e, not magnesium sulphate. They are different minerals doing different jobs, and they are constantly confused. Magnesium builds chlorophyll over three to six weeks and does nothing to moss. If your lawn is pale because it is short of magnesium — older leaves yellowing between the veins, worst on sand, worst after a hard winter — kieserite is the right answer. If you want an instant colour hit or you are fighting moss, buy iron and leave this on the shelf.\u003c\/p\u003e\n\u003cp\u003eWorth testing before you treat. Turf guidance says apply magnesium when a soil test reads at or below 20 ppm; in UK terms that is Magnesium Index 0 or 1. Lawns that have been limed recently, or fed heavily on autumn potash, are the likeliest to be genuinely short, because calcium and potassium both displace magnesium from the soil's exchange sites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eConifers and evergreen hedging\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 20–25 g\/m²  |  \u003cstrong\u003eTiming:\u003c\/strong\u003e Early spring\u003c\/div\u003e\n\u003cp\u003eBronzing and yellowing of older needles on the inside of the plant is a classic magnesium picture in conifer hedging, particularly on hedges that have never been fed. Apply along both sides of the hedge line out to the spread of the branches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eGeneral soil correction — beds, borders and no-dig plots\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 15–25 g\/m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once a year, spring\u003c\/div\u003e\n\u003cp\u003eAt Magnesium Index 0 or 1, use 25 g\/m². At Index 2, use 15 g\/m² as maintenance. At Index 3 or above, do not apply. On sandy soils an annual application is normal; on heavy clay every second or third year is usually enough. For no-dig beds, broadcast over the mulch and water in — no cultivation needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eUsing kieserite as a liquid feed\u003c\/h3\u003e\n\u003cp\u003eThe granules are made for broadcasting, but the mineral itself is fully soluble, so you can dissolve it and water it on or spray it. Two things to understand before you do.\u003c\/p\u003e\n\u003cp\u003eFirst, dissolving takes time. A 2–5mm granule in cold, still water needs \u003cstrong\u003etwo to four hours\u003c\/strong\u003e to go into solution. That is granule size and surface area, not low solubility — kieserite saturates at around 393 g per litre, and the 13 g\/L foliar rate below is barely 3% of that. Warm water and a stir at the start and end cut the time considerably.\u003c\/p\u003e\n\u003cp\u003eSecond, this is mined rock rather than a refined laboratory salt, so a little insoluble grit is normal. Let the solution stand, then decant the clear liquid or strain it through muslin before it goes anywhere near a sprayer.\u003c\/p\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eNever tank-mix with a calcium feed\u003c\/span\u003e\n\u003cp\u003eMagnesium sulphate solution plus any soluble calcium — gypsum, calcium nitrate, an amino-chelated calcium — precipitates calcium sulphate on the spot. Calcium sulphate dissolves at roughly 2.4 g per litre against kieserite's 393, so it drops out as a white sludge that blocks nozzles and takes both nutrients out of solution with it. \u003cstrong\u003eMix and apply them separately.\u003c\/strong\u003e Applied to soil on different days they work together perfectly well; in the same tank they cancel each other out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to make it up\u003c\/h4\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeigh into a bucket.\u003c\/strong\u003e Work out the total volume you need first, then the weight from the rate cards below. A level tablespoon is roughly 15 g.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStart with warm water.\u003c\/strong\u003e Add about a third of the final volume, hand-warm rather than hot, and stir hard for a minute.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeave it two to four hours.\u003c\/strong\u003e Cover it and walk away. Stir again when you come back — the last of the granules go quickly once the water is saturated near the bottom.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTop up to volume and settle.\u003c\/strong\u003e Add the remaining cold water, then leave it twenty minutes for any grit to drop out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecant or strain.\u003c\/strong\u003e Pour off the clear liquid, or strain through muslin. Essential for a sprayer, optional for a watering can. Use it within a day or two.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch4\u003eWorking out the rate\u003c\/h4\u003e\n\u003cp\u003eMost published magnesium spray guidance is written for Epsom salt. Kieserite carries about half as much magnesium again per gram, so use roughly two-thirds the Epsom weight for the same dose.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePublished Epsom rate\u003c\/th\u003e\n\u003cth\u003eEpsom\u003c\/th\u003e\n\u003cth\u003eMagnesium delivered\u003c\/th\u003e\n\u003cth\u003eKieserite equivalent\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e0.5% solution\u003c\/td\u003e\n\u003ctd\u003e5 g\/L\u003c\/td\u003e\n\u003ctd\u003e0.49 g Mg\/L\u003c\/td\u003e\n\u003ctd\u003e3 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1% solution\u003c\/td\u003e\n\u003ctd\u003e10 g\/L\u003c\/td\u003e\n\u003ctd\u003e0.99 g Mg\/L\u003c\/td\u003e\n\u003ctd\u003e6.5 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2% solution\u003c\/strong\u003e (standard horticultural foliar)\u003c\/td\u003e\n\u003ctd\u003e20 g\/L\u003c\/td\u003e\n\u003ctd\u003e1.97 g Mg\/L\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e13 g\/L\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5% solution (field-scale, not for gardens)\u003c\/td\u003e\n\u003ctd\u003e50 g\/L\u003c\/td\u003e\n\u003ctd\u003e4.93 g Mg\/L\u003c\/td\u003e\n\u003ctd\u003e33 g\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — general correction\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 6.5 g\/L to start, 13 g\/L maximum  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–3 weeks, up to three sprays\u003c\/div\u003e\n\u003cp\u003eTwo per cent Epsom solution is the long-standing horticultural foliar rate, and 13 g\/L of kieserite matches it. Start at 6.5 g\/L on anything you have not sprayed before and test a few leaves first. Spray early morning or evening, never in strong sun, and wet the undersides as well as the tops — most magnesium goes in through the lower leaf surface.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003e2% w\/v magnesium sulphate, three applications: Dadebo et al. (2026), Agronomy 16(13): 1218.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — tomatoes and peppers\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 13 g\/L  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Three sprays through the growing period\u003c\/div\u003e\n\u003cp\u003eThe tomato trial behind this rate applied 2% magnesium sulphate three times during vegetative growth and recorded gains in fruit yield, vitamin C, titratable acidity and colour alongside better nitrogen use. Useful as a rescue on plants already yellowing between the veins, where the soil correction will take too long to save the current crop.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eDadebo et al. (2026), Agronomy 16(13): 1218.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — apples, pears and top fruit\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 13 g\/L  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e From petal fall, repeat 2–3 times at 2–3 week intervals\u003c\/div\u003e\n\u003cp\u003eTree fruit guidance puts Epsom at 2 kg per 100 litres, which is the same 2% solution. Start once the leaves are properly developed or at petal fall, and repeat where symptoms are already showing. Soil correction still does the long-term work; the spray buys you this season's crop.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eBC Tree Fruit Production Guide, magnesium section — 2 kg magnesium sulphate per 100 L.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFoliar spray — grapes and vines\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 0.3–0.5 g\/L  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Up to four times during fruit fill\u003c\/div\u003e\n\u003cp\u003eGo far lighter here than anywhere else. The vine trial that measured this found the response peaked at 2.14 mM and fell away above it — the equivalent of about 0.35 g of kieserite per litre. Spraying vines at the tomato rate during fruit fill overshoots the optimum rather than improving on it. Late afternoon on a dry day.\u003c\/p\u003e\n\u003cspan class=\"drf-rate-cite\"\u003eBai, Liu, Liu \u0026amp; Yong (2024), Agronomy 14(11): 2659 — optimum 2.14 mM MgSO₄·7H₂O.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil drench — beds and borders\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 3–5 g\/L applied at 5 L\/m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once, in spring\u003c\/div\u003e\n\u003cp\u003eThis is the dry soil rate delivered in water rather than a different dose. Four grams per litre over five litres per square metre puts down 20 g\/m², exactly the general bed rate. Use it where you want the magnesium down at root depth immediately, or on a no-dig bed where you would rather not have granules sitting on the mulch. The seasonal ceiling of 30 g\/m² is the same whichever way you apply it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eSoil drench — pots, containers and growing bags\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1–2 g\/L  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Monthly through the growing season\u003c\/div\u003e\n\u003cp\u003eWater it on in place of one normal watering, enough to wet the whole rootball and just start to run from the base. One gram per litre monthly through a season lands close to the 3–5 g per 10 litres you would have mixed into the compost at potting. Skip it if the feed you are already using declares magnesium.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eDissolving does not change the total\u003c\/span\u003e\n\u003cp\u003eA litre of solution is a delivery method, not an extra dose. Whatever goes on as liquid counts towards the same 30 g per square metre seasonal ceiling as the dry granules, and the same rule applies about not applying at all above Magnesium Index 3. Foliar sprays are the one exception worth noting — they bypass the soil entirely, so they correct the plant without loading the ground, which is exactly why they suit a mid-season rescue.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eOn fruit trees and soft fruit\u003c\/h3\u003e\n\u003cp\u003eOn fruit, magnesium shortage shows as yellowing, then brown blotches, between the veins of the older leaves, often from midsummer. It's common on light, sandy or acid soils, and wherever a lot of potash has gone on. Kieserite corrects it without changing your soil's pH, so it's safe around blueberries.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhen:\u003c\/strong\u003e once a year in late winter or early spring (February–March), before flowering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow:\u003c\/strong\u003e scatter it evenly over the ground under the branches, out to the branch tips, or along the row, then water it in. A level tablespoon holds about 15 g.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApples, pears, plums, cherries:\u003c\/strong\u003e 25 g per m² (20 g if a soil test shows magnesium Index 2).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRaspberries, blackberries, currants, gooseberries, strawberries:\u003c\/strong\u003e 15–20 g per m².\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlueberries:\u003c\/strong\u003e 15 g per m². Kieserite doesn't raise pH. Never use dolomite lime on blueberries.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDon't go above 30 g per m² in a season.\u003c\/strong\u003e Skip it altogether if a soil test shows magnesium at Index 3 or above.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanting new fruit on soil tested low in magnesium (Index 0–1):\u003c\/strong\u003e fork 30 g\/m² through the bed before planting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick fix if you see symptoms in summer:\u003c\/strong\u003e dissolve 13 g in a litre of water (stir well; it can take a while to dissolve fully). Spray the leaves in the evening or on a dull day, 2–3 times, two weeks apart. Sprays green the leaves up quickly, but the spring soil dressing is what fixes the problem for next year.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeep potash and magnesium in balance.\u003c\/strong\u003e Heavy potash feeding makes magnesium shortage more likely, which is why Kieserite pairs well with Sulphate of Potash.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApples prone to bitter pit\u003c\/strong\u003e (Bramley and Cox, for example): only add magnesium where it's actually short. Extra magnesium in the fruit can add to bitter pit when calcium is low.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFruit in pots:\u003c\/strong\u003e mix 3–5 g per 10 litres of compost at potting. If symptoms appear, water with 1 g per litre once a month from May to July.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003eStep-by-step application\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the symptom first.\u003c\/strong\u003e Magnesium deficiency yellows the tissue \u003cem\u003ebetween\u003c\/em\u003e the veins while the veins stay green, and it starts on the oldest leaves. If the whole leaf is pale, or new growth is affected first, look at nitrogen or iron instead. Our guide to \u003ca href=\"\/blogs\/the-dr-forest-blog\/why-are-my-tomato-leaves-turning-yellow\"\u003eyellow leaves on tomato plants\u003c\/a\u003e walks through the patterns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeigh it rather than guessing.\u003c\/strong\u003e Twenty grams per square metre is roughly a heaped tablespoon — far less than most people scatter by eye.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpread evenly on moist soil.\u003c\/strong\u003e Broadcast across the whole root zone. Never pile it against stems or trunks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater it in.\u003c\/strong\u003e Five to ten litres per square metre, or apply just before forecast rain. This is what starts the dissolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReassess on the new growth.\u003c\/strong\u003e Leaves already damaged will not re-green, because magnesium moves out of them and does not come back. Judge the result on leaves that emerge afterwards, three to six weeks on.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eFive common mistakes\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplying it dry and walking away\u003c\/strong\u003e — without water the granules do nothing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpecting old leaves to recover\u003c\/strong\u003e — they will not. The plant has already withdrawn their magnesium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTipping dry granules into a sprayer\u003c\/strong\u003e — they need two to four hours in water first, and straining afterwards. Dissolve properly and the solution sprays fine; skip that step and you block the nozzle. See the liquid feed section above, and our take on when a magnesium spray helps in \u003ca href=\"\/blogs\/the-dr-forest-blog\/epsom-salt-for-roses-does-it-actually-work-2\"\u003eEpsom salt for roses: does it actually work?\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixing it with a calcium feed in one tank\u003c\/strong\u003e — you get calcium sulphate sludge and lose both nutrients.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdding magnesium to an already magnesium-rich clay\u003c\/strong\u003e — many UK clays are. Test before correcting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssuming any yellow leaf means magnesium\u003c\/strong\u003e — overwatering, nitrogen shortage and iron chlorosis each yellow foliage in a different pattern.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003e\u003ca href=\"\/products\/granulated-gypsum-clay-breaker\"\u003e\u003cstrong\u003eGranulated Gypsum\u003c\/strong\u003e\u003c\/a\u003e is the natural partner. Kieserite supplies magnesium and sulphur; gypsum supplies calcium and sulphur. Because magnesium and calcium compete at the root, lifting one without the other tends to create the deficiency you have just corrected in reverse. Both are pH neutral and both are granular, so they spread together and suit the same beds — particularly heavy clay, where the gypsum also improves structure. Apply them in the same pass as dry granules, at their own rates, and water in together. What you must not do is dissolve the two into one watering can: sulphate plus calcium precipitates calcium sulphate and you lose both.\u003c\/p\u003e\n\u003cp\u003eAvoid stacking kieserite with dolomitic lime in the same year. Both supply magnesium and you will overshoot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eStorage and handling\u003c\/span\u003e\n\u003cp\u003eKeep the bag closed in a dry place, off a concrete floor. Kieserite draws moisture from the air, so an open bag in a damp shed will cake into a block — break it up with a trowel and use it as normal, the analysis is unchanged. Wear gloves if you have sensitive skin, wash hands afterwards, and store out of reach of children and pets as you would any garden fertiliser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 4: FAQ ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-ks-panel4\"\u003e\n\u003ch2\u003eKieserite questions, answered\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq1\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq1\"\u003eCan I take this as a magnesium supplement, or use it in the bath?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. This is a garden fertiliser for plants and soil. It is not food grade, it has not been tested to the heavy-metal limits that apply to supplements or cosmetics, and it is not intended for human or animal consumption or for bathing. If you want magnesium for yourself, buy a product sold for that purpose from a pharmacy. Everything on this page is about feeding plants.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq2\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq2\"\u003eWhat is kieserite and what does it do?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eKieserite is the mineral form of magnesium sulphate monohydrate, MgSO₄·H₂O. It is mined, dried and graded rather than chemically manufactured. As a garden fertiliser it supplies 25% MgO (15% magnesium) and 50% SO₃ (20% sulphur), both as sulphate, which is the form plant roots take up directly. Magnesium sits at the centre of the chlorophyll molecule; sulphur builds the amino acids cysteine and methionine.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq3\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq3\"\u003eWhat is the difference between kieserite and Epsom salts?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eWater of crystallisation, which changes the concentration and the format rather than the speed. Epsom salt is magnesium sulphate heptahydrate — seven water molecules, 9.8% magnesium, 710 g\/L soluble. Kieserite is the monohydrate — one water molecule, 15% magnesium, 393 g\/L soluble. Both are fully soluble sulphates and both act quickly. The practical split is format. Kieserite comes as a granule for broadcasting over soil and gives you half as much magnesium again per kilo; Epsom salt is a fine crystal that dissolves in seconds. If you want to spray kieserite you can, but it needs two to four hours in water and a strain first — see the liquid feed section under How to Use, which includes the conversion table for turning any published Epsom rate into a kieserite one.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq4\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq4\"\u003eHow much magnesium fertiliser do I need per square metre?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eFor most garden plants, 15–25 g\/m² once a year in spring. Potatoes and top fruit take the upper end at 25–30 g\/m². Leafy vegetables and ericaceous shrubs need less, around 15 g\/m². A level tablespoon is roughly 15 g. Do not exceed 30 g\/m² in a season.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq5\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq5\"\u003eHow do I know my plants actually need magnesium?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eLook at the pattern, not the colour alone. Magnesium deficiency yellows the tissue between the veins while the veins themselves stay green, and it always starts on the older, lower leaves because the plant moves magnesium up to new growth. A uniformly pale leaf points to nitrogen. Yellow new leaves with green veins point to iron. A soil test giving a Magnesium Index settles it properly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq6\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq6\"\u003eWill kieserite change my soil pH?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. Magnesium sulphate is pH neutral in solution, which is the main reason to choose it over dolomitic lime. Dolomite supplies magnesium but raises pH, so it is unusable on blueberries, rhododendrons, azaleas and camellias, and it does little on soils already at pH 7 or above. Kieserite works at any pH.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq7\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq7\"\u003eCan I apply too much?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes, and it matters. Magnesium competes with calcium and potassium for uptake at the root. Push magnesium too high and you suppress calcium, which brings \u003ca href=\"\/blogs\/the-dr-forest-blog\/blossom-end-rot-tomatoes\"\u003eblossom end rot in tomatoes\u003c\/a\u003e and bitter pit in apples. On clay soils, excess magnesium also degrades crumb structure and makes the ground harder to work. Stay within 30 g\/m² per season and skip it entirely if a soil test shows Magnesium Index 3 or above.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq8\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq8\"\u003eHow quickly will I see results?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eThree to six weeks in the new growth, provided the soil stays moist. Judge it on leaves that emerge after the application. Leaves already yellow will not re-green, because the plant has withdrawn their magnesium and redistributed it — that damage is permanent on those leaves.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq9\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq9\"\u003eIs it organic, and is it safe for children, pets and bees?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eKieserite is a mined mineral, screened and graded, with nothing added. It is a mineral rather than a certified organic input, so we do not describe it as certified organic. It has no pesticide action, so it poses no risk to bees or other pollinators. Water it into the soil after applying and keep children and pets off the treated area until you have.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq10\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq10\"\u003eCan I mix it with other Dr Forest products?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. It pairs particularly well with \u003ca href=\"\/products\/granulated-gypsum-clay-breaker\"\u003eGranulated Gypsum\u003c\/a\u003e — kieserite brings magnesium and sulphur, gypsum brings calcium and sulphur, and because the two cations compete at the root it makes sense to lift them together rather than one at a time. Both are pH neutral and both are granular, so they spread in the same pass. It also sits happily alongside granular fertilisers. Two things to avoid: applying it in the same season as dolomitic lime, since both supply magnesium; and dissolving it into the same tank as any calcium feed, which precipitates calcium sulphate and takes both nutrients out of solution. As dry granules on soil they pair perfectly — it is only in the watering can that they clash.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-ks-faq11\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-ks-faq11\"\u003eCan I dissolve kieserite in water and use it as a liquid feed?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes. It is fully soluble at around 393 g\/L, so a foliar spray or a soil drench both work. The catch is time: a 2–5mm granule needs two to four hours in water, ideally started warm and stirred at both ends. Because this is mined rock rather than a refined salt, let the solution settle and decant or strain it before it goes in a sprayer. As a rule of thumb, kieserite carries about half as much magnesium again per gram as Epsom salt, so use roughly two-thirds the weight of any published Epsom rate — the standard 2% foliar solution works out at 13 g of kieserite per litre. Full rates by crop, and the conversion table, are in the How to Use tab.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- PAA FAQ additions 2026-10-05 (proposed) --\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-ks-faq-paa1\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-ks-faq-paa1\" class=\"drf-faq-q\"\u003eCan I mix kieserite with NPK or potash fertiliser?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eYes, as dry granules. It sits happily alongside granular fertilisers and spreads in the same pass. It's useful with high-potash feeding, because heavy potash holds back magnesium uptake. Two things to avoid: dolomitic lime in the same season, because both supply magnesium, and dissolving it in the same can as a calcium feed.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-ks-faq-paa2\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-ks-faq-paa2\" class=\"drf-faq-q\"\u003eWhy choose kieserite over other magnesium fertilisers?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eIt's soluble, so the magnesium is available as soon as it gets wet. It doesn't change soil pH, so it's safe on ericaceous beds. It also carries 20% sulphur. Compared with Epsom salt, it's 15% magnesium against 9.8%, so you spread less product for the same dose. Dolomitic lime also supplies magnesium, but it raises pH.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-ks-faq-paa3\" type=\"checkbox\"\u003e\u003ch3 class=\"drf-faq-h\"\u003e\u003clabel for=\"drf-ks-faq-paa3\" class=\"drf-faq-q\"\u003eWhich plants benefit most from kieserite?\u003c\/label\u003e\u003c\/h3\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eTomatoes, especially in growing bags fed heavily with potash. Also potatoes, roses and flowering shrubs, apples, pears, currants and raspberries on light soils, and ericaceous plants such as rhododendron, camellia, azalea and blueberry. On lawns it deepens the green without forcing soft growth. Look for yellowing between the veins on older, lower leaves.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"1.5kg","offer_id":58378071212406,"sku":"DF-KIES-1.5","price":10.49,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":58378071245174,"sku":"DF-KIES-4","price":19.35,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":58378071277942,"sku":"DF-KIES-9","price":30.99,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":58378071310710,"sku":"DF-KIES-15","price":44.49,"currency_code":"GBP","in_stock":true},{"title":"30kg","offer_id":58378071343478,"sku":"DF-KIES-30","price":89.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/parent-kies.jpg?v=1791377899"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/collections\/organic-fulvic-acid-powder-humic-brown-resealable-pouch-dr-forest-957.webp?v=1792502730","url":"https:\/\/www.drforest.co.uk\/collections\/hydrangea-ericaceous.oembed","provider":"Dr Forest","version":"1.0","type":"link"}