{"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; 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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-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\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\"\u003eSlow Release\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eChloride-Free\u003c\/span\u003e \u003cspan class=\"drf-badge drf-badge-green\"\u003eRecyclable Packaging\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePolyhalite is a naturally occurring mineral fertiliser that supplies four macronutrients — potassium, calcium, magnesium and sulphur — from a single Yorkshire crystal.\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 slow-release form from a single natural input. Think of it as a multi-nutrient upgrade on sulphate of potash: the same chloride-free potash, plus the calcium, magnesium and sulphur most garden soils also need. Approved for EU organic production under EC 834\/2007, with one of the lowest carbon footprints of any commercial fertiliser. 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 chloride-free potash source\u003c\/strong\u003e — supplies 14% K₂O as potassium sulphate, the same chloride-free potash as sulphate of potash (SOP), 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, so polyhalite is safe for acid-loving plants like blueberries, rhododendrons and camellias\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow-release 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\u003eSlow release — nutrients available across the full growing season\u003c\/li\u003e\n\u003cli\u003eChloride-free, 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\u003eEU organic approved under EC 834\/2007\u003c\/li\u003e\n\u003cli\u003eOne of the lowest carbon footprints of any commercial fertiliser\u003c\/li\u003e\n\u003cli\u003eOne product replaces sulphate of potash, gypsum and Epsom salt\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 our full guide — \u003cem\u003ewhat is polyhalite and how does it work\u003c\/em\u003e — linked from the Science tab.\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: a 260-million-year-old multi-nutrient mineral\u003c\/h2\u003e\n\u003ch3\u003eWhat polyhalite actually is\u003c\/h3\u003e\n\u003cp\u003ePolyhalite (K₂Ca₂Mg(SO₄)₄·2H₂O) is a hydrated sulphate of potassium, calcium and magnesium. It formed during the Permian period when a vast shallow ocean — the Zechstein Sea — evaporated under hot, arid conditions across what is now northern Europe. As the water retreated, dissolved minerals concentrated into dense crystalline layers and were sealed underground for 260 million years. The world's largest known deposit sits beneath North Yorkshire, estimated at over two billion tonnes.\u003c\/p\u003e\n\u003cp\u003eThis polyhalite is extracted from Boulby Mine on the North Yorkshire coast — over 1,200 metres beneath the North Sea. It undergoes no chemical separation or industrial refining. Just mining, crushing, screening and granulation. That minimal processing gives it one of the lowest carbon footprints of any commercially available fertiliser at roughly 0.034 kg CO₂ per kg of product.\u003c\/p\u003e\n\u003cp\u003eWant the full background — how polyhalite formed, how it's mined and how it compares to other potash sources? Read our companion guide, \u003cem\u003ewhat is polyhalite\u003c\/em\u003e, on the Dr Forest blog.\u003c\/p\u003e\n\u003chr class=\"drf-sep\"\u003e\n\u003ch3\u003ePolyhalite composition and nutrient content\u003c\/h3\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\u003cp\u003eAll four nutrients are present as sulphates — the form plants absorb directly through the roots. The crystalline structure means these sulphates dissolve at different rates depending on soil moisture and temperature, creating a natural slow-release effect that pre-mixed soluble salts cannot replicate.\u003c\/p\u003e\n\u003cdiv class=\"drf-pullquote\"\u003eA single ancient ocean. Four nutrients in one crystal. No chemical processing.\u003c\/div\u003e\n\u003ch3\u003eWhy slow release matters\u003c\/h3\u003e\n\u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\n\u003ch4\u003eReduced leaching, longer residual\u003c\/h4\u003e\n\u003cp\u003eTransport and leaching of Ca, Mg, K and S after polyhalite application is significantly lower than after equivalent soluble salts, because the sulphate ions in polyhalite adsorb more strongly to soil particles. Trials consistently show a higher residual effect into the following season — the mineral keeps feeding subsequent crops, which improves both economics and soil biology over time. In container growing and raised beds, where leaching is a constant problem, this extended availability matters.\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\u003eStaggered nutrient availability\u003c\/h4\u003e\n\u003cp\u003eUniversity of Nottingham research confirmed that 50–60% of the sulphur in polyhalite is immediately plant-available, with the remainder releasing gradually across the growing season. This staggered release pattern matches the way plants actually take up nutrients — demand rises through vegetative growth, flowering and fruiting. A single application at planting can supply nutrients for months rather than days.\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\u003e921 trials, 47 crops, 33 countries\u003c\/h4\u003e\n\u003cp\u003eA landmark meta-analysis published in \u003cem\u003eAgronomy Journal\u003c\/em\u003e (2025) combined data from 921 replicated field trials across 47 crops in 33 countries, conducted between 2014 and 2023. Polyhalite raised yields by 3.8–16.3% over NP controls. Crops with the strongest responses were potato, peanut, onion and oilseeds — all of which have high calcium and sulphur demand.\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\u003eCalcium without pH change\u003c\/h4\u003e\n\u003cp\u003eMost calcium amendments — lime, dolomite — raise soil pH significantly, which makes them unsuitable for acid-loving plants or already-alkaline soils. Polyhalite delivers calcium as calcium sulphate (gypsum form), which is pH-neutral. So you can correct calcium deficiency — preventing blossom end rot in tomatoes, bitter pit in apples, tip burn in lettuce — without disturbing your soil pH at all.\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\u003eSoil microbial activity\u003c\/h4\u003e\n\u003cp\u003eField trials show polyhalite application positively influences soil microbial biomass carbon and FDA hydrolase activity — both indicators of a biologically active, healthy soil. The calcium and sulphur content improve cation exchange capacity and aggregate stability, creating better habitat for beneficial soil organisms. On wheat, treatments using 100% K from polyhalite produced the highest soil organic carbon and microbial activity compared to conventional fertiliser programmes.\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\u003eMeta-analysis of polyhalite's yield performance across diverse soil, crop and environmental conditions (2025). \u003cem\u003eAgronomy Journal\u003c\/em\u003e, 117, e70259. (921 trials, 47 crops, 33 countries.)\u003c\/li\u003e\n\u003cli\u003eGopinath, K.A. et al. (2024). Exploring the use of POLY4 for the improvement of productivity, peanut quality and soil properties in Southern India. \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e, 15, 1448909.\u003c\/li\u003e\n\u003cli\u003eSingh, S.P. et al. (2025). Polyhalite as an alternate nutrient source for improving growth, yield and nutrient use efficiency in onion and garlic. \u003cem\u003eScientific Reports\u003c\/em\u003e, 15.\u003c\/li\u003e\n\u003cli\u003eKumar, R. et al. (2025). Polyhalite nutrients driving balanced crop nutrition and sustainable agricultural productivity. \u003cem\u003eDiscover Soil\u003c\/em\u003e.\u003c\/li\u003e\n\u003cli\u003eBarbarick, K.A. (1991). Polyhalite applications to sorghum-sudangrass and leaching in soil columns. \u003cem\u003eSoil Science\u003c\/em\u003e, 151, 159–166.\u003c\/li\u003e\n\u003cli\u003eMello, S.D.C. et al. (2018). Potato response to polyhalite as a potassium source fertiliser in Brazil: yield and quality. \u003cem\u003eHortScience\u003c\/em\u003e, 53(3), 373–379.\u003c\/li\u003e\n\u003cli\u003eMello, S.D.C. et al. (2018). Response of tomato to polyhalite as a multi-nutrient fertiliser in southeast Brazil. \u003cem\u003eJ. Plant Nutr.\u003c\/em\u003e, 41(16), 2126–2140.\u003c\/li\u003e\n\u003cli\u003eTiwari, D.D. et al. (2015). Effects of polyhalite as a fertiliser on yield and quality of oilseed crops mustard and sesame. \u003cem\u003ee-ifc\u003c\/em\u003e, 42, 10–17.\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 id=\"drf-pl-panel3\" class=\"drf-panel\"\u003e\n\u003ch2\u003eHow to use polyhalite: application rates and guide\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 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. The slow-release profile 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. The slow-release profile means less frequent applications 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 the mineral used in professional turf nutrition programmes at the highest level.\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\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\u003eFrequently asked questions about polyhalite\u003c\/h2\u003e\n\u003cdiv class=\"drf-faq\"\u003e\n\u003cinput id=\"drf-pl-faq1\" type=\"checkbox\"\u003e\u003clabel for=\"drf-pl-faq1\" class=\"drf-faq-q\"\u003eWhat is polyhalite?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003ePolyhalite is a naturally occurring mineral with the formula K₂Ca₂Mg(SO₄)₄·2H₂O. It formed 260 million years ago when the Zechstein Sea evaporated, concentrating dissolved minerals into dense crystalline layers beneath what is now North Yorkshire. It supplies four macronutrients — potassium, calcium, magnesium and sulphur — all as sulphates, with virtually zero chloride. It's mined, crushed and granulated with no chemical processing.\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\u003clabel for=\"drf-pl-faq2\" class=\"drf-faq-q\"\u003eWhat is polyhalite used for?\u003c\/label\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 chloride-free potash source, 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\u003clabel for=\"drf-pl-faq3\" class=\"drf-faq-q\"\u003eWhat crops benefit most from polyhalite?\u003c\/label\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\u003clabel for=\"drf-pl-faq4\" class=\"drf-faq-q\"\u003eWhere is polyhalite mined?\u003c\/label\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\u003clabel for=\"drf-pl-faq5\" class=\"drf-faq-q\"\u003eIs polyhalite a potash fertiliser?\u003c\/label\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 chloride-free form as sulphate of potash (SOP). 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\u003clabel for=\"drf-pl-faq6\" class=\"drf-faq-q\"\u003eHow is polyhalite different from sulphate of potash?\u003c\/label\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 slow-release product.\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\u003clabel for=\"drf-pl-faq7\" class=\"drf-faq-q\"\u003eIs polyhalite organic?\u003c\/label\u003e\n\u003cdiv class=\"drf-faq-a\"\u003e\n\u003cdiv\u003ePolyhalite is approved for use in EU organic production under Regulation (EC) 834\/2007 as a naturally mined crude salt. It's also approved by the Soil Association and OMRI Listed. No chemical separation or industrial processing is involved — 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\u003clabel for=\"drf-pl-faq8\" class=\"drf-faq-q\"\u003eIs polyhalite a complete fertiliser?\u003c\/label\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\u003clabel for=\"drf-pl-faq9\" class=\"drf-faq-q\"\u003eWill polyhalite change my soil pH?\u003c\/label\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. That makes polyhalite safe for acid-loving plants like blueberries, azaleas and rhododendrons, as well as for soils that are already neutral or alkaline.\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\u003clabel for=\"drf-pl-faq10\" class=\"drf-faq-q\"\u003eCan polyhalite prevent blossom end rot?\u003c\/label\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 slow-release form, 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\u003clabel for=\"drf-pl-faq11\" class=\"drf-faq-q\"\u003eHow quickly does polyhalite work?\u003c\/label\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\u003clabel for=\"drf-pl-faq12\" class=\"drf-faq-q\"\u003eIs this the same as Polysulphate?\u003c\/label\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\/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","url":"https:\/\/www.drforest.co.uk\/products\/polyhalite","provider":"Dr Forest","version":"1.0","type":"link"}