{"product_id":"powdered-cal-mag-supplement-boron-fulvic-acid-dr-forest","title":"Cal-Mag for Plants | pH Neutral Gypsum \u0026 Kieserite | Calcium Magnesium Sulphur Feed | Dr Forest","description":"\u003c!-- Dr Forest — Cal-Mag for Plants — Shopify Product Description (v1.0 Design System, 5-tab) --\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!-- Prefix: cm. Pure CSS radio tabs + checkbox FAQs. No JS, no @import, :root variables. --\u003e\n\u003cstyle\u003e\n  .drf-wrap {\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  \/* ── RESET \u0026 BASE ── *\/\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', 'Helvetica Neue', Arial, sans-serif; font-weight: 400; color: #2c2c2c; font-size: 16px; line-height: 1.65; width: 100%; max-width: 100%; margin: 0 auto; overflow: hidden; }\n\n  \/* ── TYPOGRAPHY ── *\/\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 400; font-size: 2em; color: var(--drf-grn); line-height: 1.2; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', Georgia, serif; 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}\n\n  \/* ── COMPARISON BOXES (stacked) ── *\/\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-white); }\n  .drf-compare-box h4 { margin-top: 0; color: var(--drf-grn); text-transform: none; letter-spacing: 0; font-size: 1.1em; font-family: 'Cormorant Garamond', Georgia, serif; font-weight: 500; border-bottom: 1px solid var(--drf-gold); padding-bottom: 0.4em; margin-bottom: 0.6em; }\n\n  \/* ── FAQ ACCORDIONS (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: 0.85em 0; cursor: pointer; font-weight: 500; color: var(--drf-grn); font-size: 0.98em; }\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-q::after { content: '\\2212'; background: var(--drf-grn); border-color: var(--drf-grn); color: #fff; }\n  .drf-faq input:checked ~ .drf-faq-a { max-height: 800px; }\n\n  \/* ── REFERENCES ── *\/\n  .drf-refs { font-size: 0.78em; color: #8a8a8a; 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\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); color: #fff; padding: 0.6em 0.8em; text-align: left; font-weight: 500; font-size: 0.8em; letter-spacing: 0.08em; text-transform: uppercase; }\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: #f4f7f4; }\n\n  \/* ── SIGN-OFF ── *\/\n  .drf-signoff { font-family: 'Cormorant Garamond', Georgia, serif; font-style: italic; font-size: 1.05em; color: var(--drf-muted); margin-top: 1.4em; }\n\u003c\/style\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput type=\"radio\" name=\"drf-cm-tabset\" id=\"drf-cm-tab1\" checked\u003e \u003cinput type=\"radio\" name=\"drf-cm-tabset\" id=\"drf-cm-tab2\"\u003e \u003cinput type=\"radio\" name=\"drf-cm-tabset\" id=\"drf-cm-tab3\"\u003e \u003cinput type=\"radio\" name=\"drf-cm-tabset\" id=\"drf-cm-tab4\"\u003e \u003cinput type=\"radio\" name=\"drf-cm-tabset\" id=\"drf-cm-tab5\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-cm-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-cm-tab2\"\u003eIngredients\u003c\/label\u003e \u003clabel for=\"drf-cm-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-cm-tab4\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-cm-tab5\"\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-cm-panel1\"\u003e\n\u003ch2\u003ecalcium, magnesium and sulphur in one pH-neutral feed\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDr Forest Cal-Mag is a pH-neutral calcium, magnesium and sulphur feed for plants\u003c\/strong\u003e, built on two naturally mined minerals — gypsum and kieserite — both permitted for use in organic growing. It supplies roughly 16% calcium, 4% magnesium and 18% sulphur in a balanced 4:1 calcium-to-magnesium ratio. Unlike garden lime, it raises calcium without lifting your soil pH, so you can correct a shortage without disturbing a pH you are happy with.\u003c\/p\u003e\n\u003cp\u003eIt is a small-batch blend handcrafted in Stockport, designed to sit alongside your Dr Forest fertilisers at 10% of the feed rate, so calcium and magnesium are never the nutrient that runs short. A trace of humic-stabilised boron — calcium's partner element — and a little fulvic acid round it out and help the plant take everything up.\u003c\/p\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\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\"\u003e~4:1 Ca to Mg\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eMined Minerals\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003ePlant-Based, Peat-Free\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eMade in Stockport\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eGarden use only — not a human supplement\u003c\/span\u003e\n\u003cp\u003eThis is a plant and soil product. It is not food-grade, not tested to supplement standards, and contains boron that is not intended for human consumption. If you are looking for a calcium-magnesium supplement to take yourself, this is not it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e~16%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCalcium\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e~4%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMagnesium\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e~18%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSulphur\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e~4:1\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCa : Mg Ratio\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat gardeners use it for\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlongside Dr Forest fertilisers\u003c\/strong\u003e — add at 10% of your feed rate so calcium and magnesium keep pace with everything else the plant is being fed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlossom end rot\u003c\/strong\u003e — keeps calcium well supplied to developing tomatoes and chillies, the crops most prone to it. Best paired with steady, even watering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium deficiency\u003c\/strong\u003e — tip burn in lettuce, distorted or curling new growth on heavy-feeding plants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnesium deficiency\u003c\/strong\u003e — interveinal yellowing on the older, lower leaves while the veins stay green.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft-water gardens\u003c\/strong\u003e — rainwater and low-mineral tap water carry very little calcium or magnesium of their own.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStage-feeding (veg \u0026amp; bloom)\u003c\/strong\u003e — calcium demand climbs as fruit and flowers set and cell walls are built.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy clay soil\u003c\/strong\u003e — gypsum helps flocculate tight clay, improving drainage and root penetration over time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThis cal-mag vs dosing two products separately\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eDr Forest cal-mag powder\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOne powder: calcium, magnesium, sulphur, boron and fulvic acid, pre-balanced to ~4:1 Ca:Mg.\u003c\/li\u003e\n\u003cli\u003epH-neutral mined-mineral base; mix it into the soil, top-dress and water in, or apply as a stirred suspension.\u003c\/li\u003e\n\u003cli\u003eBoron held in a slow-release humic complex, so it does not wash straight through.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eWeighing gypsum and Epsom salt yourself\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eTwo products to measure, and the ratio is easy to get wrong.\u003c\/li\u003e\n\u003cli\u003eEpsom salt is mostly water of crystallisation, so you carry less magnesium per gram.\u003c\/li\u003e\n\u003cli\u003eNo boron and no fulvic acid in the mix.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"drf-signoff\"\u003eHandcrafted in small batches in Stockport.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 2: INGREDIENTS ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-cm-panel2\"\u003e\n\u003ch2\u003ewhat's in the blend\u003c\/h2\u003e\n\u003cp\u003eFour inputs, each doing one job. The two mined minerals carry the calcium, magnesium and sulphur; the boron and fulvic acid are small additions that make those nutrients work harder in the plant.\u003c\/p\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eNaturally mined gypsum — 75%\u003c\/h4\u003e\n\u003cp\u003eCalcium sulphate dihydrate, roughly 23% calcium and 18% sulphur. A mined mineral permitted for use in organic growing, and the bulk of the calcium and sulphur in the blend. It dissolves to release calcium without raising soil pH, which is what sets it apart from lime.\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\u003eMined kieserite — 25%\u003c\/h4\u003e\n\u003cp\u003eMagnesium sulphate monohydrate, roughly 16% magnesium and 22% sulphur. Another mined mineral permitted in organic growing. Because it holds far less water than Epsom salt (one water molecule rather than seven), it carries more magnesium per gram and stores without caking.\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\u003eHumic-stabilised boron — 4%\u003c\/h4\u003e\n\u003cp\u003eBoron fused into a humic-acid complex. Boron is the most easily leached of all the trace elements, so binding it to humic acid keeps it in the root zone and releases it slowly. It works as a calcium synergist — present at roughly 0.1% boron in the finished blend, a trace, deliberately kept small.\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\u003eFulvic acid — 0.5%\u003c\/h4\u003e\n\u003cp\u003eA low-molecular-weight biostimulant that complexes calcium and magnesium and helps carry them into the roots and around the plant. A small inclusion that improves the uptake of everything else in the blend.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eGuaranteed analysis (approximate)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eNutrient\u003c\/th\u003e\n\u003cth\u003eElemental\u003c\/th\u003e\n\u003cth\u003eOxide form\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalcium (Ca)\u003c\/td\u003e\n\u003ctd\u003e~16%\u003c\/td\u003e\n\u003ctd\u003e~22% CaO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnesium (Mg)\u003c\/td\u003e\n\u003ctd\u003e~4%\u003c\/td\u003e\n\u003ctd\u003e~6.6% MgO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulphur (S)\u003c\/td\u003e\n\u003ctd\u003e~18%\u003c\/td\u003e\n\u003ctd\u003e~45% SO₃\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoron (B)\u003c\/td\u003e\n\u003ctd\u003e~0.1% (trace)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCa : Mg ratio\u003c\/td\u003e\n\u003ctd\u003e~4 : 1\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eValues are nominal, calculated from the mineral inputs. Confirm against the figures on your product label before quoting them as guaranteed.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 3: HOW TO USE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-cm-panel3\"\u003e\n\u003ch2\u003ehow to use Dr Forest cal-mag\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWater quality first\u003c\/span\u003e\n\u003cp\u003eUse rainwater or stand tap water for 24 hours where you can. The fulvic acid binds calcium and magnesium from hard tap water before it reaches the plant, so soft water gets the best out of the blend.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eApplying it with water\u003c\/span\u003e\n\u003cp\u003eIf you water it in, treat it as a suspension, not a clear solution. The calcium, magnesium and sulphur dissolve, but the boron is held in a humic form that does not — it settles to the bottom. So stir the powder into your water, leave it to stand about 30 minutes (the kieserite is slow to dissolve), then keep it moving and pour the whole lot onto the soil, sediment and all, so the boron goes down with it. Apply to the root zone only — never through a sprayer or a fine rose, which will clog and leave the boron behind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication rates\u003c\/h3\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eA note on the dose\u003c\/span\u003e\n\u003cp\u003eThese rates look modest next to instant liquid feeds, but the whole dose reaches the roots: you pour the full suspension onto the soil, where the gypsum releases its calcium steadily rather than in one quick flush. Gram for gram it delivers more calcium than a typical bottled cal-mag — it just feeds the soil slowly, the way it should.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eWith Dr Forest fertilisers — the simple rule\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 10% of your fertiliser dose  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e every feed\u003c\/div\u003e\n\u003cp\u003eWhatever you are feeding, add cal-mag at one tenth of that weight. Feeding 5 g of fertiliser? Add 0.5 g of cal-mag. Feeding 10 g? Add 1 g. Either top-dress it when you feed, or stir it into the same water and pour the lot onto the soil. This keeps calcium and magnesium in step with the rest of the feed without overdoing it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eTop-dressing established plants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ~30 g per m², or a level teaspoon (about 5 g) per established plant in a large pot  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e every 4–6 weeks in the growing season\u003c\/div\u003e\n\u003cp\u003eScatter over the surface, scratch lightly into the top centimetre and water in. Keep it light — it is a calcium and magnesium top-up, not the main feed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eMixing into a soil or potting mix\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ~1–2 g per litre of potting compost, or ~50 g per m² forked into the top 10–15 cm of a bed  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e once, at planting or when mixing up\u003c\/div\u003e\n\u003cp\u003eBlends a season’s worth of calcium and magnesium evenly through the root zone. Useful in peat-free and coir-based mixes, which hold little calcium of their own, and for opening up heavy clay before planting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eWatering it in (used on its own)\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1 g per litre routine, up to 2 g per litre for heavy feeders or poor soils  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e every 2–3 weeks\u003c\/div\u003e\n\u003cp\u003eFor gardeners not on a Dr Forest feed who want steady calcium and magnesium. Stir it into the can as a suspension, keep it moving and pour the whole lot — sediment included — over the root zone. Not for sprayers or fine roses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eCorrecting a visible deficiency\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1–2 g per litre, watered in  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e repeat every 2–3 weeks until new growth recovers\u003c\/div\u003e\n\u003cp\u003eStir and pour the whole suspension over the root zone. Calcium is immobile in the plant, so it fixes new growth, not the leaves already damaged — and steady, repeated supply matters more than a single strong dose. Watch the fresh growth that follows to judge whether it has worked.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eSensitive crops — go lighter\u003c\/span\u003e\n\u003cp\u003eA few plants are sensitive to boron, which builds up slowly in the soil with repeated use. On these, halve the amount or apply half as often. The boron-sensitive group is beans and peas; strawberries and other soft and cane fruit (raspberries, blackberries, currants, gooseberries); top and stone fruit (apples, pears, cherries, plums, peaches); grapevines; and onions, garlic and leeks. Most other plants — including tomatoes, chillies and the bulk of vegetables — are fine at the standard rate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eStep by step\u003c\/h3\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasure.\u003c\/strong\u003e Weigh the dose — 10% of your feed weight, or about 1 g per litre on its own.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisperse.\u003c\/strong\u003e If top-dressing, mix the powder through an equal volume of dry soil or mix first so it does not clump on the surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMix to a suspension.\u003c\/strong\u003e If watering it in, add to water and stir. The fulvic and kieserite dissolve (kieserite is slow — give it about 30 minutes), but the boron will not — it settles. Keep the can moving so the boron stays carried through.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply to the soil.\u003c\/strong\u003e Pour the whole lot — sediment included — over the root zone, or top-dress it when you feed. Never through a sprayer or fine rose.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater in.\u003c\/strong\u003e If you top-dressed, follow with plain water to carry it down to the roots.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eDo not double the boron\u003c\/span\u003e\n\u003cp\u003eBoron is needed only in trace amounts and becomes toxic just above sufficiency — the gap between \"enough\" and \"too much\" is narrow. The 10% rate keeps boron comfortably in the safe band. \u003cstrong\u003eDo not stack this with a separate boron product, and do not exceed the rates above to \"make up\" for a deficiency.\u003c\/strong\u003e Pick the one method that suits your setup rather than layering several at once. With boron, more is not better.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWorks well combined with…\u003c\/span\u003e\n\u003cp\u003ePairs with the Dr Forest Veg 4-4-4 and Bloom feeds for stage-feeding (veg \u0026amp; bloom), where calcium demand rises through fruit and flower set. The Dr Forest Fulvic Acid Powder is the natural companion if you want to push uptake further in soft-water gardens.\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 dry and sealed in the compostable pouch. Gypsum and kieserite both absorb moisture and will cake if left open. Store cool and dry, out of reach of children and pets. Kept dry, it lasts several years.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eFive common mistakes\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreating it like a fertiliser.\u003c\/strong\u003e It is a supplement to a feed, not a feed in its own right.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver-dosing the boron.\u003c\/strong\u003e Stick to the 10% rule and do not layer boron products.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpecting it to repair old damage.\u003c\/strong\u003e Calcium is immobile — judge it by the new growth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsing hard tap water.\u003c\/strong\u003e The fulvic underperforms; switch to rainwater where you can.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeaving the pouch open.\u003c\/strong\u003e It draws in moisture and clumps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 4: THE SCIENCE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-cm-panel4\"\u003e\n\u003ch2\u003ethe science behind the blend\u003c\/h2\u003e\n\u003cp\u003eCalcium and magnesium are the two structural cations a plant draws on most heavily, and they compete for the same uptake sites at the root. Supply them badly out of balance and one suppresses the other. This blend pairs a pH-neutral calcium source with a soluble magnesium source at a sensible 4:1 ratio, then adds the two elements that make calcium work — boron and fulvic acid.\u003c\/p\u003e\n\u003cdiv class=\"drf-pullquote\"\u003eFeed the soil's calcium and magnesium together, in balance, and you stop either one becoming the limit.\u003c\/div\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eCalcium and sulphur without a pH swing\u003c\/h4\u003e\n\u003cp\u003eGypsum (CaSO₄·2H₂O) dissolves to calcium and sulphate ions and is essentially pH-neutral. Unlike lime, it raises plant-available calcium without raising soil pH, which makes it the right calcium source where pH is already where you want it.\u003csup\u003e1\u003c\/sup\u003e\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\u003eFast magnesium from kieserite\u003c\/h4\u003e\n\u003cp\u003eMagnesium sulphate monohydrate dissolves to release Mg²⁺, the central atom of every chlorophyll molecule. Magnesium is the element most often overlooked in feeding programmes, yet it powers the sugar transport that fills fruit and flowers.\u003csup\u003e2\u003c\/sup\u003e\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\u003eA balanced 4:1, not a magic ratio\u003c\/h4\u003e\n\u003cp\u003eSevere cation imbalance causes antagonism at the root, but the old idea of a single \"ideal\" calcium-to-magnesium ratio is overstated — the real goal is sufficiency of each nutrient across a wide workable range. A 4:1 supply delivers plenty of both without one crowding out the other.\u003csup\u003e3\u003c\/sup\u003e\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\u003eBoron, calcium's partner\u003c\/h4\u003e\n\u003cp\u003eBoron governs the movement of calcium through the plant and cross-links the pectins that hold cell walls together. Deficiency shows first at the growing points and in poor fruit and seed set — the same places calcium problems appear, which is why the two are dosed together.\u003csup\u003e4\u003c\/sup\u003e\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\u003eHolding boron in place\u003c\/h4\u003e\n\u003cp\u003eBoron is the most leachable trace element and washes out of low-humus soils quickly. Fusing it into a humic complex keeps it in the root zone and releases it gradually, so a small, safe dose lasts rather than draining away after the first watering.\u003csup\u003e5\u003c\/sup\u003e\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 an uptake aid\u003c\/h4\u003e\n\u003cp\u003eLow-molecular-weight fulvic acid complexes mineral cations and acts as a biostimulant, improving the uptake and translocation of calcium and magnesium into and around the plant.\u003csup\u003e6\u003c\/sup\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e07\u003c\/span\u003e\n\u003ch4\u003eSulphur, the quiet third nutrient\u003c\/h4\u003e\n\u003cp\u003eBoth mined minerals are sulphate sources, so the blend also supplies sulphur — a secondary nutrient needed for protein and enzyme synthesis and increasingly short in modern soils.\u003csup\u003e7\u003c\/sup\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific References\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eShainberg, I., Sumner, M.E., Miller, W.P., et al. (1989). Use of gypsum on soils: A review. \u003cem\u003eAdvances in Soil Science\u003c\/em\u003e, 9, 1–111.\u003c\/li\u003e\n\u003cli\u003eCakmak, I. \u0026amp; Yazici, A.M. (2010). Magnesium: A forgotten element in crop production. \u003cem\u003eBetter Crops with Plant Food\u003c\/em\u003e, 94(2), 23–25.\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\u003eBrown, P.H., Bellaloui, N., Wimmer, M.A., et al. (2002). Boron in plant biology. \u003cem\u003ePlant Biology\u003c\/em\u003e, 4(2), 205–223.\u003c\/li\u003e\n\u003cli\u003eCanellas, L.P., Olivares, F.L., Aguiar, N.O., et al. (2015). Humic and fulvic acids as biostimulants in horticulture. \u003cem\u003eScientia Horticulturae\u003c\/em\u003e, 196, 15–27.\u003c\/li\u003e\n\u003cli\u003eMarschner, H. (2012). \u003cem\u003eMarschner's Mineral Nutrition of Higher Plants\u003c\/em\u003e, 3rd ed. Academic Press.\u003c\/li\u003e\n\u003cli\u003eHawkesford, M.J. \u0026amp; De Kok, L.J. (2006). Managing sulphur metabolism in plants. \u003cem\u003ePlant, Cell \u0026amp; Environment\u003c\/em\u003e, 29(3), 382–395.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ═══════════ TAB 5: FAQ ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-cm-panel5\"\u003e\n\u003ch2\u003ecal-mag for plants — your questions\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq1\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq1\"\u003eCan I take this as a cal-mag supplement?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. This is a garden product for plants and soil. It is not food-grade, has not been tested to the heavy-metal and purity standards a human supplement must meet, and it contains boron that is not intended for people to ingest. For a calcium-magnesium supplement to take yourself, speak to a pharmacy — not this listing.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq2\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq2\"\u003eWhat is Dr Forest cal-mag?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eA calcium, magnesium and sulphur feed for plants, built on naturally mined gypsum and kieserite, with a trace of boron and a little fulvic acid. It supplies roughly 16% calcium, 4% magnesium and 18% sulphur in a balanced 4:1 calcium-to-magnesium ratio. It is a supplement to your feeding programme, used to keep these structural nutrients from running short.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq3\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq3\"\u003eHow much do I use with my Dr Forest fertiliser?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eAdd it at 10% of your fertiliser dose, every feed. If you are feeding 5 g of fertiliser, add 0.5 g of cal-mag; for 10 g, add 1 g. Top-dress it when you feed, or stir it into the same water and pour the lot onto the soil. That keeps calcium and magnesium in step with the rest of the feed without overdoing it.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq4\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq4\"\u003eDoes it prevent blossom end rot in tomatoes and chillies?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt is a strong tool for it. Blossom end rot is a calcium shortage at the fruit, and tomatoes and chillies are the crops most prone to it, so keeping calcium well supplied is a key part of preventing it. One honest caveat: blossom end rot is often less about how much calcium is in the soil and more about calcium reaching the fruit, which uneven or erratic watering disrupts. So feed cal-mag to keep the supply up, and water steadily and evenly alongside it — together they give you the best protection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq5\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq5\"\u003eWill it change my soil pH?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. Gypsum is calcium sulphate and is pH-neutral, so it adds calcium without lifting your soil pH. That is the main reason to choose it over garden lime or dolomite, which both raise pH.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq6\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq6\"\u003eHow is this different from garden lime?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eLime (calcium carbonate) raises calcium and soil pH at the same time, which is fine if your soil is acidic but a problem if it is not. This blend raises calcium with no pH shift, so you can correct a calcium shortage without disturbing a pH you are happy with.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq7\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq7\"\u003eWhy kieserite instead of Epsom salt?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eKieserite is the naturally mined monohydrate form of magnesium sulphate. It holds far less water than Epsom salt (one water molecule versus seven), so it carries more magnesium per gram, stores without caking, and is permitted for use in organic growing as a mined mineral.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq8\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq8\"\u003eDo I still need it if my fertiliser already has calcium?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eMost likely, yes. Dr Forest feeds carry some calcium and magnesium from minerals such as polyhalite, but the heavy biostimulant loading limits how much built-in calcium and magnesium there is room for. Adding cal-mag at 10% of the feed rate makes sure these two structural nutrients are never the limiting factor.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq9\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq9\"\u003eCan I apply too much boron?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eYes — boron is toxic to plants in excess, and its safe window is narrow. The boron in this blend is a deliberate trace (~0.1%) held in a slow-release humic complex, and the rates given keep it well within the safe band. The rule is simple: do not stack it with another boron product, and do not exceed the stated rates.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq10\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq10\"\u003eIs it a calcium or a magnesium deficiency I'm seeing?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eCalcium symptoms appear in new growth — distorted young leaves, blossom end rot in tomatoes and chillies, tip burn in lettuce. Magnesium symptoms appear in old growth — interveinal yellowing on the lower, older leaves while the veins stay green. Calcium is immobile, magnesium is mobile, which is why they show up at opposite ends of the plant.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq11\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq11\"\u003eCan I use it as a foliar spray?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNo. It is a soil product, and it does not make a clean solution — the boron and some of the gypsum stay as fine sediment that would clog a sprayer or fine rose and leave the boron behind. Calcium is also immobile in the plant, so getting it to the roots is the reliable route. Apply it to the soil, not the leaves.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq12\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq12\"\u003eIs it organic?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt is built on mined minerals — gypsum and kieserite — that are permitted for use in organic growing, and it is made with organic-allowable inputs. It is not a certified organic product. If certification matters for your situation, check the inputs against your own scheme's rules, as boron is a restricted input under some organic standards.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq13\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq13\"\u003eDoes hard water matter?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eIt does for the fulvic acid. Hard tap water is already high in calcium and magnesium, which bind the fulvic before it can do its job. Use rainwater, or stand tap water for 24 hours, to get the best from the blend. The mineral feeding itself still works in hard water — it is only the fulvic that prefers soft.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq14\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq14\"\u003eWill it fully dissolve?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eNot fully, and it is not meant to. The calcium, magnesium and sulphur dissolve (the kieserite is slow, so give it about 30 minutes), but the boron is held in a humic form that does not dissolve — it settles to the bottom. If you water it in, treat it as a suspension: keep it stirred and pour the whole lot, sediment and all, over the soil so the boron goes down too. Or simply apply it dry and water in.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq15\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq15\"\u003eIs it safe around children, pets and bees?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eTreat it like any garden product: keep it out of reach of children and pets and do not ingest it. Used at the rates given, the mineral inputs are not a hazard to bees. It is a plant-based, peat-free soil and plant feed, not a pesticide.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-cm-faq16\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-cm-faq16\"\u003eWhere is it made?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003eHandcrafted in small batches in Stockport, Greater Manchester, blended and packed by hand.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Dr Forest","offers":[{"title":"750g","offer_id":57869675954550,"sku":null,"price":10.49,"currency_code":"GBP","in_stock":true},{"title":"1.5kg","offer_id":40818694160571,"sku":null,"price":12.99,"currency_code":"GBP","in_stock":true},{"title":"3kg","offer_id":40818694193339,"sku":null,"price":22.49,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":44741035983035,"sku":null,"price":50.49,"currency_code":"GBP","in_stock":true},{"title":"18kg","offer_id":44741036048571,"sku":null,"price":80.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/powdered-cal-mag-supplement-boron-fulvic-acid-dr-forest-fertiliser-442.webp?v=1772228683","url":"https:\/\/www.drforest.co.uk\/products\/powdered-cal-mag-supplement-boron-fulvic-acid-dr-forest","provider":"Dr Forest","version":"1.0","type":"link"}