{"product_id":"micronized-volcanic-rock-dust","title":"Micronised Volcanic Rock Dust","description":"\u003c!-- Dr Forest — Micronised Volcanic Rock Dust Product Page (v2 — Design System v1.0) --\u003e\n\u003c!-- Prefix: drf-vr- · 4-tab layout · Pure CSS radio-input tabs + checkbox FAQ. No JavaScript. Shopify-safe. --\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); 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; 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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\u003c\/style\u003e\n\n\n\u003c!-- ===== 4-TAB BODY (Overview \/ The Science \/ How to Use \/ FAQ) ===== --\u003e\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n\u003cinput type=\"radio\" name=\"drf-vr-tabset\" id=\"drf-vr-tab1\" checked\u003e \u003cinput type=\"radio\" name=\"drf-vr-tabset\" id=\"drf-vr-tab2\"\u003e \u003cinput type=\"radio\" name=\"drf-vr-tabset\" id=\"drf-vr-tab3\"\u003e \u003cinput type=\"radio\" name=\"drf-vr-tabset\" id=\"drf-vr-tab4\"\u003e\n\u003cdiv class=\"drf-tab-labels\"\u003e\n\u003clabel for=\"drf-vr-tab1\"\u003eOverview\u003c\/label\u003e \u003clabel for=\"drf-vr-tab2\"\u003eThe Science\u003c\/label\u003e \u003clabel for=\"drf-vr-tab3\"\u003eHow to Use\u003c\/label\u003e \u003clabel for=\"drf-vr-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-vr-panel1\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eMade by Growers · Backed by Science\u003c\/span\u003e\n\u003ch2\u003eMicronised volcanic rock dust: fine volcanic rock powder for beds, pots and compost tea\u003c\/h2\u003e\n\u003cdiv class=\"drf-badge-row\"\u003e\n\u003cspan class=\"drf-badge drf-badge-green\"\u003eMicronised powder\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003e48% silica\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eCompost tea ready\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eSingle ingredient · mined\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-dark\"\u003ePacked in Stockport\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMicronised volcanic rock dust is finely ground volcanic silicate rock that weathers in moist soil to release silicon and trace minerals, and raises the pH of acid soil as it does so.\u003c\/strong\u003e Grinding the rock to a fine powder gives soil water far more surface to work on than a granule, so the same weight of rock reacts sooner. This is the fast format of the pair Dr Forest sells: a zeolite-bearing volcanic silicate, 48% silica, pH 11, milled fine enough to stay suspended in an aerated compost tea.\u003c\/p\u003e\n\u003cp\u003eIt is a soil conditioner, not a fertiliser. There is no useful nitrogen in it and it will not replace your feed. What it does is put back the slow-release minerals that decades of cropping and peat-free compost leave short, and it does it in a form that gets going within a single season. Use it in potting mixes, rake it into beds at planting, dust it through the compost heap, or add it to a tea brew. For lawns and large areas where dust is a nuisance, the \u003ca href=\"\/products\/organic-granulated-volcanic-rock-minerals-basalt-soil-conditioner\"\u003egranulated rock dust\u003c\/a\u003e is the easier product to spread.\u003c\/p\u003e\n\u003cdiv class=\"drf-stats\"\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e48%\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eSilica\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003epH 11\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eRaises acid soil\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e1–2 g\/L\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eCompost tea rate\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e100 g\/m²\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eBed maintenance\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat micronised rock dust is used for in the garden\u003c\/h3\u003e\n\u003cul class=\"drf-uses\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompost tea mineral enrichment\u003c\/strong\u003e — the powder stays in suspension in an aerated brew, so a trace-mineral drench goes on with the microbes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePotting mixes\u003c\/strong\u003e — 5 g per litre at potting; fine particles weather within the season, which granules in a pot do not\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemineralising beds\u003c\/strong\u003e — raked into the top 5 cm at 100 g\/m², or worked deeper at 200–300 g\/m² on new or tired ground\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA gentler lime alternative\u003c\/strong\u003e — at pH 11 it lifts acid soil gradually, and brings silica and trace minerals that lime does not\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilicon supply\u003c\/strong\u003e — silicon deposited in stems and leaves gives structurally stronger plants that hold up better under drought and heavy fruit loads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompost heap activation\u003c\/strong\u003e — a dusting between layers, where heat and microbial acids weather the rock faster than open soil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon capture\u003c\/strong\u003e — silicate weathering ties up dissolved CO₂ as bicarbonate; a small contribution per garden, but a measured one\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMicronised powder or granulated rock dust?\u003c\/h3\u003e\n\u003cdiv class=\"drf-compare\"\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eMicronised volcanic rock powder (this product)\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFine powder with the most surface area per gram, so it weathers first\u003c\/li\u003e\n\u003cli\u003eSuspends in water: the only format that works in compost tea or a drench\u003c\/li\u003e\n\u003cli\u003eThe right choice for pots, potting mixes and one-season results\u003c\/li\u003e\n\u003cli\u003eRaises pH usefully at 200–400 g\/m²\u003c\/li\u003e\n\u003cli\u003eDusty. Apply on still days, or to moist soil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-compare-box\"\u003e\n\u003ch4\u003eDr Forest granulated volcanic rock dust\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eCoarser grains that release over months to years\u003c\/li\u003e\n\u003cli\u003eSpreads cleanly across lawns and large beds without dust\u003c\/li\u003e\n\u003cli\u003eBuilds a mineral reserve that stays in the soil for years\u003c\/li\u003e\n\u003cli\u003eWill not suspend in liquid, so no use in tea\u003c\/li\u003e\n\u003cli\u003eMost people end up using both: powder for the season in hand, granules for the years after\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\"\u003eSmall-batch in Stockport\u003c\/span\u003e\n\u003cp\u003eA single mined ingredient, milled fine, weighed out and packed by hand in small batches in Stockport, Greater Manchester. Vegan and free of animal by-products by nature; nothing added. Safe to use around children, pets, bees and wildlife once it is in the soil. If you want the longer story on what rock dust can and cannot do, read \u003ca href=\"\/blogs\/the-dr-forest-blog\/volcanic-rock-dust-guide\"\u003eHow volcanic rock dust works\u003c\/a\u003e. \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-vr-panel2\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eThe Science\u003c\/span\u003e\n\u003ch2\u003eWhy this powder weathers faster\u003c\/h2\u003e\n\u003ch3\u003eWhat is in this micronised powder\u003c\/h3\u003e\n\u003cp\u003eThis rock is a volcanic silicate with zeolite minerals intact: 48% silica by analysis, pH 11 in water. Milled to a fine powder, it presents a large reactive surface to soil moisture. It does not dissolve like a soluble feed; it weathers. Water and the weak acids from roots and microbes free silicon, calcium, magnesium, potassium and trace elements slowly, along with bicarbonate that buffers acidity.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eWhat it means in the garden\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilica (SiO₂)\u003c\/td\u003e\n\u003ctd\u003e48%\u003c\/td\u003e\n\u003ctd\u003eWeathers to silicic acid, the only form plants can take up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003epH (dry powder)\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003eRaises acid soil gradually; not a concern at compost-tea rates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eMicronised powder\u003c\/td\u003e\n\u003ctd\u003eStays suspended in aerated liquid; weathers within a season\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMineral class\u003c\/td\u003e\n\u003ctd\u003eZeolite-bearing volcanic silicate\u003c\/td\u003e\n\u003ctd\u003eCation exchange and water holding alongside mineral release\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFiner grind means a response this season in pots, beds and compost tea — that is the SKU job. For the full evidence on silicon, yield trials, liming and carbon (Kelland, Skov, Beerling and the rest), read \u003ca href=\"\/blogs\/the-dr-forest-blog\/volcanic-rock-dust-guide\"\u003eHow volcanic rock dust works\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- ═══════════ TAB 3 — HOW TO USE ═══════════ --\u003e\n\u003cdiv class=\"drf-panel\" id=\"drf-vr-panel3\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eHow to Use\u003c\/span\u003e\n\u003ch2\u003eHow to use micronised volcanic rock dust: compost tea, soil rates and pH correction\u003c\/h2\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eDust precaution\u003c\/span\u003e\n\u003cp\u003eThe micronised powder is very fine and will become airborne in dry, windy conditions. Apply on calm days or when soil is moist. Wear a dust mask when handling in enclosed spaces such as polytunnels or glasshouses. Outdoors in normal conditions no mask is required for typical garden quantities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eA soil conditioner, not a fertiliser\u003c\/span\u003e\n\u003cp\u003eRock dust supplies minerals; \u003cstrong\u003eit does not replace nitrogen or fast-acting nutrition\u003c\/strong\u003e. Run it alongside a base feed such as \u003ca href=\"\/products\/organic-all-purpose-fertiliser-4-4-4\"\u003eOrganic All Purpose Fertiliser 4-4-4\u003c\/a\u003e or a crop-specific blend, and give it a season. Even the fine powder works by weathering, not instant solubility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eMethod 1: compost tea mineral enrichment\u003c\/h3\u003e\n\u003cp\u003eAdding the powder to an actively aerated compost tea brew introduces a broad trace-mineral spectrum alongside the microbial content of the tea. The fine particles suspend in the aerated liquid and the minerals are partially chelated by the fulvic and humic acids produced during brewing, which makes them more readily plant-available.\u003c\/p\u003e\n\u003col class=\"drf-steps\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrepare your compost tea as normal.\u003c\/strong\u003e Fill your brew vessel with dechlorinated water, add compost or worm castings in a mesh bag, and start your air pump and airstone. Begin aeration before adding the rock dust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdd the powder at 1–2 g per litre of brew volume.\u003c\/strong\u003e For a 20-litre bucket, add 20–40 g. The agitation from the airstone keeps the fine particles in suspension throughout the brew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrew for the normal period, 24–48 hours.\u003c\/strong\u003e Keep the air pump running throughout. The rock dust remains suspended during active aeration and minerals are progressively chelated by the organic acids produced during the brew.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply immediately after brewing.\u003c\/strong\u003e Use within 4 hours of switching off the pump. Stir well before applying to redistribute any settled particles. Apply as a soil drench or foliar spray (filter through 200 micron mesh for fine spray nozzles).\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eCompost tea rate reference\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 1–2 g per litre of brew  |  \u003cstrong\u003e20-litre bucket:\u003c\/strong\u003e 20–40 g\u003c\/div\u003e\n\u003cp\u003eFor an enhanced mineral drench, add \u003ca href=\"\/products\/fulvic-acid\"\u003eFulvic Acid Powder\u003c\/a\u003e at 1–2 g\/L to the finished tea before application. The fulvic acid chelates the volcanic minerals into a more immediately plant-available form.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eMethod 2: soil broadcast and incorporation\u003c\/h3\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eVegetable beds and borders: maintenance\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 100 g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Spring and\/or autumn\u003c\/div\u003e\n\u003cp\u003eScatter over moist soil surface and rake into the top 5 cm immediately to prevent wind dispersal. Water in well. The fine particles begin weathering on contact with soil moisture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eNew or depleted beds: first application\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 200–300 g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once, before first planting\u003c\/div\u003e\n\u003cp\u003eIncorporate into the top 15–20 cm thoroughly before planting. Use the higher rate for soils that have never received rock dust or that are known to be mineral-depleted. The fine particles begin producing silicic acid and releasing trace minerals within days of incorporation into moist soil.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eContainers and potting media\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 5 g per litre of compost (approx. 1 teaspoon per litre)  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Once at potting\u003c\/div\u003e\n\u003cp\u003eMix thoroughly into compost before planting. Far more effective than granulated rock dust in containers: the fine particles weather within a single growing season, releasing their mineral content while the plant is actively growing. Worth doing in peat-free media, which contain very little native mineral content.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eCompost heap activation\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e Light dusting between layers  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Each time you add material\u003c\/div\u003e\n\u003cp\u003eDust between green and brown layers as you build or turn the heap. The heat, moisture and microbial acidity within an active compost heap weather the fine particles far faster than open soil, and the finished compost carries the mineral content with it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eAcid soil pH correction: lime alternative\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e 200–400 g per m²  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Annually until target pH is reached\u003c\/div\u003e\n\u003cp\u003eAt pH 11, the powder raises soil pH progressively through the same weathering reaction that releases its minerals. Apply 200–400 g\/m² annually and test soil pH each spring. The correction is gentler and longer-lasting than lime, with no overliming risk, and it supplies trace minerals and silica that lime does not. Expect pH to rise by approximately 0.3–0.5 units per growing season at the higher application rate, depending on starting pH and soil type. If you are not sure which way your soil needs to go, start with \u003ca href=\"\/blogs\/the-dr-forest-blog\/how-to-increase-or-decrease-your-soil-ph\"\u003ehow to make soil more acidic, or raise the pH\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRates at a glance\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\u003eFrequency\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompost tea\u003c\/td\u003e\n\u003ctd\u003e1–2 g per litre of brew (20–40 g per 20 L)\u003c\/td\u003e\n\u003ctd\u003eEach brew; use within 4 hours of stopping aeration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBeds and borders, maintenance\u003c\/td\u003e\n\u003ctd\u003e100 g per m²\u003c\/td\u003e\n\u003ctd\u003eSpring and\/or autumn\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNew or depleted beds\u003c\/td\u003e\n\u003ctd\u003e200–300 g per m²\u003c\/td\u003e\n\u003ctd\u003eOnce, before first planting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContainers and potting media\u003c\/td\u003e\n\u003ctd\u003e5 g per litre of compost\u003c\/td\u003e\n\u003ctd\u003eOnce at potting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompost heap\u003c\/td\u003e\n\u003ctd\u003eLight dusting between layers\u003c\/td\u003e\n\u003ctd\u003eEach time you add material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcid soil pH correction\u003c\/td\u003e\n\u003ctd\u003e200–400 g per m²\u003c\/td\u003e\n\u003ctd\u003eAnnually until target pH is reached\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eA note on timescales\u003c\/span\u003e\n\u003cp\u003eEven micronised powder works through mineral weathering rather than instant solubility; this is not a liquid fertiliser. The finer particle size means faster results than granulated material, but the full mineral benefit still builds over one or more growing seasons. Most growers notice silicon-driven improvements, stronger stems and firmer fruit, within the first season. The mineral reserve compounds over successive annual applications.\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\u003eCombine with a base granular fertiliser, the \u003ca href=\"\/products\/organic-all-purpose-fertiliser-4-4-4\"\u003eOrganic All Purpose Fertiliser 4-4-4\u003c\/a\u003e or a crop-specific blend. Adding \u003ca href=\"\/products\/fulvic-acid\"\u003eFulvic Acid Powder\u003c\/a\u003e to compost tea applications improves mineral uptake, since the fulvic acid chelates the volcanic minerals for root absorption. For long-term soil building, combine with soluble \u003ca href=\"\/products\/humic-acid\"\u003eHumic Acid Flakes\u003c\/a\u003e as a monthly soil drench and \u003ca href=\"\/products\/organic-granulated-volcanic-rock-minerals-basalt-soil-conditioner\"\u003eGranulated Volcanic Rock Dust\u003c\/a\u003e for the slow-release reservoir. Use \u003ca href=\"\/products\/bokashi-soil-conditioner\"\u003eGrow-Kashi\u003c\/a\u003e to inoculate the biology that weathers rock particles fastest.\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 bag sealed, or decant into an airtight tub, somewhere cool and dry. The powder draws moisture from the air and clumps if left open; clumping does not affect it, but it makes measuring a nuisance. Stored dry it does not go off. Rock does not have a shelf life.\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-vr-panel4\"\u003e\n\u003cspan class=\"drf-eyebrow\"\u003eQuestions \u0026amp; Answers\u003c\/span\u003e\n\u003ch2\u003eFrequently asked questions about this micronised powder\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq1\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq1\"\u003eWhat is this micronised powder for?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThis bag is the fine powder form: fast-weathering silicon and 60+ trace minerals for compost tea, pots and beds, with a dry pH of 11 so it also works as a gentle lime alternative. For the definition of rock dust itself — what it is, silicon, carbon and the research — see \u003ca href=\"\/blogs\/the-dr-forest-blog\/volcanic-rock-dust-guide\"\u003eHow volcanic rock dust works\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-vr-faq2\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq2\"\u003eWhy choose the powder over the granulated version?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThe powder has far more surface area per gram, so it weathers sooner. Pick it when you want a response this season, when you want to use it in compost tea or a drench, or when mixing into potting compost. The granulated version is better for lawns and open ground where you want a long-term reserve without dust. Plenty of people use both: powder for the fast hit, granules for the years after.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq3\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq3\"\u003eCan I use it to raise soil pH instead of lime?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. The dry powder is pH 11, and it raises soil pH progressively through the same weathering reaction that releases its minerals. Apply 200–400 g\/m² annually and test soil pH each spring; expect roughly 0.3–0.5 units per season at the higher rate, depending on your starting pH and soil type. It is gentler and slower than lime, with no overliming risk, and it brings silica and trace minerals that lime does not.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq4\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq4\"\u003eIs it safe to put in compost tea?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. The powder stays in suspension while the pump runs and the minerals are partly chelated by the organic acids the brew produces. At 1–2 g per litre the pH 11 of the dry powder is negligible; the brew water and its organic acids buffer it. Add 20–40 g to a 20-litre bucket, keep the air on for 24–48 hours, and use it within 4 hours of stopping aeration.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq5\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq5\"\u003eWill the powder block my sprayer or watering can?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eA watering can is fine. For a sprayer with fine nozzles, strain the tea through 200 micron mesh or finer first; most of the powder passes, and straining protects the nozzle. Do not run powder suspensions through drip irrigation emitters. Drench around the plants instead.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq6\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq6\"\u003eDoes volcanic rock dust replace fertiliser?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNo. It supplies silicon and trace minerals that most fertilisers leave out, and nothing much in the way of nitrogen. Use it alongside a base feed such as \u003ca href=\"\/products\/organic-all-purpose-fertiliser-4-4-4\"\u003eOrganic All Purpose Fertiliser 4-4-4\u003c\/a\u003e or a crop-specific blend. The minerals it supplies are the cofactors that let plants make full use of the NPK they are given.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq7\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq7\"\u003eHow quickly will I see results?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eWithin the first season for silicon-driven changes such as stronger stems and firmer fruit, because the fine powder starts producing silicic acid soon after it meets moist soil. The mineral reserve builds over successive annual applications. If you want a result you can see in a week, this is the wrong product; that is what a liquid feed is for.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq8\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq8\"\u003eIs it safe for children, pets, bees and edible crops?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. It is ground rock with nothing added, and there is no withholding period on edible crops. The Sheffield and Newcastle silicate-rock trials both checked for potentially toxic elements in the harvested crop and found no significant accumulation. Once it is raked in or watered in, the garden is safe for children and pets as normal. The one precaution is the dust itself: apply on a still day or to moist soil, and wear a mask in enclosed spaces.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq9\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq9\"\u003eIs it organic, and is it vegan?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt is a single mined mineral with nothing added, so it suits organic, no-dig and vegan growing. It contains no animal or plant material of any kind, and no synthetic chemistry.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-vr-faq10\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-vr-faq10\"\u003eHow should I store the powder?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eSealed, cool and dry. Reseal the bag after each use or decant into an airtight tub. It absorbs moisture from the air and clumps if left open, which does no harm but makes it awkward to measure. Kept dry it lasts indefinitely.\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-vr-faq-paa1\" type=\"checkbox\"\u003e\u003clabel for=\"drf-vr-faq-paa1\" class=\"drf-faq-q\"\u003eWhere can I buy volcanic rock dust in the UK?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eHere. This micronised volcanic rock dust is packed in Stockport in 500 g, 1.5 kg, 4 kg, 9 kg and 15 kg bags and posted to any UK address. It's the fine powder: a zeolite-bearing volcanic silicate, 48% silica, pH 11, ground fine enough to stay suspended in compost tea and to start weathering in the first season. If you want a slower, longer-lasting dressing for open ground, the same rock comes as \u003ca href=\"\/products\/organic-granulated-volcanic-rock-minerals-basalt-soil-conditioner\"\u003egranulated rock dust\u003c\/a\u003e.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-vr-faq-paa2\" type=\"checkbox\"\u003e\u003clabel for=\"drf-vr-faq-paa2\" class=\"drf-faq-q\"\u003eHow much rock dust should I add to soil?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003e\u003cp\u003eFor established beds and borders, 100 g per m² in spring and\/or autumn, scattered on moist soil and raked into the top 5 cm. For new or depleted beds, 200–300 g per m² once, worked into the top 15–20 cm before planting. In pots, 5 g per litre of compost (about a teaspoon) mixed in at potting. In compost tea, 1–2 g per litre of brew. If you're using it to raise the pH of acid soil, 200–400 g per m² a year, testing each spring. Rake it in straight away so it doesn't blow about.\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- \/PAA FAQ additions --\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- ===== END 4-TAB BODY ===== --\u003e\n","brand":"Dr Forest","offers":[{"title":"500g","offer_id":53587294323062,"sku":"DF-BASALT-500G","price":5.99,"currency_code":"GBP","in_stock":true},{"title":"1.5kg","offer_id":44205185794235,"sku":"DF-BASALT-1.5","price":11.0,"currency_code":"GBP","in_stock":true},{"title":"4kg","offer_id":33358119108696,"sku":"DF-BASALT-4","price":22.0,"currency_code":"GBP","in_stock":true},{"title":"9kg","offer_id":33358119141464,"sku":"DF-BASALT-9","price":40.49,"currency_code":"GBP","in_stock":true},{"title":"15kg","offer_id":44740971888827,"sku":"DF-BASALT-15","price":65.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/micronized-volcanic-rock-minerals-basalt-organic-soil-conditioner-975.webp?v=1786553589","url":"https:\/\/www.drforest.co.uk\/products\/micronized-volcanic-rock-dust","provider":"Dr Forest","version":"1.0","type":"link"}