{"product_id":"organic-bloom-booster-2-10-5-solution-grade-powder-dr-forest","title":"Organic Bloom Booster 2-10-5 | Fast-Acting Soluble Powder | Dr Forest","description":"\u003c!-- Dr Forest — Organic Bloom Booster 2-10-5 — Shopify Product Page (v2, Design System v1.0) --\u003e\n\u003c!-- Recipe update: potassium now from Sulphate of Potash (was micronised potassium mineral); magnesium now from Kieserite (was Epsom salt \/ magnesium mineral). Name unchanged. --\u003e\n\u003cstyle\u003e\n  .drf-wrap *, .drf-wrap *::before, .drf-wrap *::after { box-sizing: border-box; margin: 0; padding: 0; }\n  .drf-wrap { font-family: 'Jost', sans-serif; font-weight: 400; color: #2c2c2c; font-size: 14px; line-height: 1.65; width: 100%; max-width: 100%; overflow: hidden; }\n  :root {\n    --drf-grn:        #1B3D2F;\n    --drf-grn-light:  #E8F0EB;\n    --drf-grn-mid:    #4a7a5e;\n    --drf-grn-dark:   #0F2A1F;\n    --drf-gold:       #C5A55A;\n    --drf-gold-light: #FAF7F0;\n    --drf-cream:      #F5F2EC;\n    --drf-border:     #d4cfc5;\n    --drf-muted:      #3A4A40;\n    --drf-white:      #FFFFFF;\n  }\n  .drf-wrap h2 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.9em; color: var(--drf-grn); line-height: 1.25; margin-bottom: 0.5em; }\n  .drf-wrap h3 { font-family: 'Cormorant Garamond', serif; font-weight: 400; font-size: 1.35em; color: var(--drf-grn); margin: 1.4em 0 0.4em; }\n  .drf-wrap h4 { font-family: 'Jost', sans-serif; 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margin: 0; }\n  .drf-refs li { margin-bottom: 0.3em; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"drf-wrap\"\u003e\n\u003cdiv class=\"drf-tabs-wrap\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-bb-tabset\" id=\"drf-bb-tab1\" checked\u003e\n  \u003cinput type=\"radio\" name=\"drf-bb-tabset\" id=\"drf-bb-tab2\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-bb-tabset\" id=\"drf-bb-tab3\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-bb-tabset\" id=\"drf-bb-tab4\"\u003e\n  \u003cinput type=\"radio\" name=\"drf-bb-tabset\" id=\"drf-bb-tab5\"\u003e\n\n  \u003cdiv class=\"drf-tab-labels\"\u003e\n    \u003clabel for=\"drf-bb-tab1\"\u003eOverview\u003c\/label\u003e\n    \u003clabel for=\"drf-bb-tab2\"\u003eIngredients\u003c\/label\u003e\n    \u003clabel for=\"drf-bb-tab3\"\u003eHow to Use\u003c\/label\u003e\n    \u003clabel for=\"drf-bb-tab4\"\u003eThe Science\u003c\/label\u003e\n    \u003clabel for=\"drf-bb-tab5\"\u003eFAQ\u003c\/label\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panels\"\u003e\n\n  \u003cdiv class=\"drf-panel\" id=\"drf-bb-panel1\"\u003e\n    \u003ch2\u003eOrganic Bloom Booster 2-10-5 — a fast-acting soluble powder for the exact moment a plant sets flower\u003c\/h2\u003e\n\n    \u003cdiv class=\"drf-badge-row\"\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eNPK 2-10-5\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eSolution Grade\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eFast Release\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eSulphate of Potash\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eKieserite Magnesium\u003c\/span\u003e\n      \u003cspan class=\"drf-badge drf-badge-green\"\u003eJust Add Water\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cp\u003e\u003cstrong\u003eBloom Booster 2-10-5 is a solution-grade powder\u003c\/strong\u003e built around the moment a plant shifts from leafy growth to flowering and fruiting. It makes up into a liquid solution when added to water, reaching the root zone within hours — a deliberately low-nitrogen, high-phosphorus ratio that supports flower and fruit development rather than more leaf.\u003c\/p\u003e\n    \u003cp\u003eThe phosphorus (micronised rock phosphate) and calcium (micronised gypsum) are milled to an ultra-fine particle size for fast breakdown, while nitrogen (amino acids) and potassium (\u003cstrong\u003eSulphate of Potash\u003c\/strong\u003e) go fully into solution. Magnesium now comes from \u003cstrong\u003eKieserite\u003c\/strong\u003e, a naturally mined mineral, in place of the Epsom salt used previously. Soluble seaweed extract and humic and fulvic acid complete the formula.\u003c\/p\u003e\n    \u003cp\u003eThis is a timed intervention, not a season-long feeding programme. It is applied at flowering and through fruit set — see \u003cem\u003eBooster vs granular\u003c\/em\u003e below, and the timing guide on the How to Use tab.\u003c\/p\u003e\n\n    \u003cdiv class=\"drf-stats\"\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003e2-10-5\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eBloom NPK\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eHours\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eTo Root Zone\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eSOP\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003ePotassium Source\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"drf-stat\"\u003e\n\u003cspan class=\"drf-stat-number\"\u003eKieserite\u003c\/span\u003e\u003cspan class=\"drf-stat-label\"\u003eMagnesium Source\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003ch3\u003eWhat Bloom Booster is used for in the garden\u003c\/h3\u003e\n    \u003cul class=\"drf-uses\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFirst flower trigger\u003c\/strong\u003e — the moment a tomato, chilli, courgette or bean plant sets its first bud is the signal to switch from a nitrogen-led feed to Bloom Booster\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eThrough fruit set and swell\u003c\/strong\u003e — repeated applications support the phosphorus and potassium demand of developing fruit\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eRoses and flowering shrubs\u003c\/strong\u003e — a bud-to-bloom boost timed to flush cycles, for more flowers and stronger colour\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStrawberries and soft fruit\u003c\/strong\u003e — applied from flowering through fruiting for size and yield\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOrchids and container flowering plants\u003c\/strong\u003e — a gentle, low-rate feed timed to bud development\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eFruit trees\u003c\/strong\u003e — supports blossom and early fruit set in spring\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eReviving a reluctant flowerer\u003c\/strong\u003e — a plant that's leafy but won't bloom often responds to a lower-nitrogen, higher-phosphorus drench within days\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003ch3\u003eBooster vs granular — two different jobs\u003c\/h3\u003e\n    \u003cdiv class=\"drf-compare\"\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eBloom Booster 2-10-5 (soluble powder, fast release)\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eMixes into a liquid solution — nutrients reach the root zone within hours\u003c\/li\u003e\n          \u003cli\u003eApplied at the moment a plant sets flower, and through fruit set\u003c\/li\u003e\n          \u003cli\u003eConcentrated powder — you add the water, no shipping weight\u003c\/li\u003e\n          \u003cli\u003eNo standing nutrient reserve in the soil between applications\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eOrganic Bloom Fertiliser 2-8-4 (granular, slow release)\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eBreaks down over weeks as soil microbes and moisture work on it\u003c\/li\u003e\n          \u003cli\u003eApplied at planting or on a schedule as the background feed for flowering and fruiting beds\u003c\/li\u003e\n          \u003cli\u003eOne application covers weeks, not one watering\u003c\/li\u003e\n          \u003cli\u003eBuilds a standing nutrient reserve — but can't respond to the exact day a plant sets flower\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"drf-pullquote\"\u003eThe granular feeds the season. The Booster feeds the flower.\u003chr class=\"drf-sep\"\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panel\" id=\"drf-bb-panel2\"\u003e\n    \u003ch2\u003eAll seven inputs — what they do and why each one is in the formula\u003c\/h2\u003e\n    \u003cp\u003eBloom Booster's 2-10-5 ratio is deliberately low in nitrogen and high in phosphorus, so every input is chosen to support flower and fruit development without pushing more leaf. Two ingredients changed in this recipe: potassium now comes from Sulphate of Potash rather than a micronised potassium mineral, and magnesium now comes from Kieserite rather than Epsom salt.\u003c\/p\u003e\n\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\u003ch4\u003eMicronised rock phosphate — phosphorus, the lead nutrient\u003c\/h4\u003e\n\u003cp\u003ePhosphorus drives flower and root development and is the largest single input in this formula. Milling it to an ultra-fine particle size increases its reactive surface area so it starts releasing within days rather than sitting inert in the soil.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\u003ch4\u003eSulphate of Potash — potassium, fully soluble\u003c\/h4\u003e\n\u003cp\u003eSulphate of Potash (SOP) is roughly 50% K₂O and 18% sulphur, and it is genuinely chloride-free. It replaces the micronised potassium mineral used previously: because SOP dissolves completely in water, potassium — the nutrient that governs fruit quality, sugar transport and colour — is now fully soluble rather than split between a fast and a slow-release form.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\u003ch4\u003eAmino acids — nitrogen, kept deliberately low and soluble\u003c\/h4\u003e\n\u003cp\u003eA small, fast-acting nitrogen input that supports the plant without triggering the leafy growth that competes with flowering. Amino acids are absorbed directly by root transporters rather than waiting on microbial conversion.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\u003ch4\u003eMicronised gypsum — calcium, fast-breaking mineral\u003c\/h4\u003e\n\u003cp\u003eCalcium is essential for cell wall strength in developing fruit — a shortfall shows up as disorders like blossom end rot in tomatoes. The micronised form keeps pace with the fast phosphorus and potassium in this formula.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\u003ch4\u003eKieserite — magnesium, naturally mined mineral\u003c\/h4\u003e\n\u003cp\u003eKieserite (magnesium sulphate monohydrate) is roughly 25% MgO and 50% SO₃. It replaces the Epsom salt previously used in this formula. Magnesium sits at the centre of the chlorophyll molecule, and a shortfall during heavy fruiting shows up as interveinal yellowing on older leaves. As a mined mineral, Kieserite also contributes further sulphur to the feed.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e06\u003c\/span\u003e\u003ch4\u003eSoluble seaweed extract — hormones and trace minerals\u003c\/h4\u003e\n\u003cp\u003eNatural cytokinins and auxins support fruit set and reduce flower and fruit drop under stress, alongside over 60 trace elements in immediately available form.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e07\u003c\/span\u003e\u003ch4\u003eHumic and fulvic acid — uptake enhancement\u003c\/h4\u003e\n\u003cp\u003eFulvic acid chelates the mineral nutrients in the drench and increases root cell membrane permeability, so the phosphorus and potassium this formula relies on are absorbed more efficiently.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panel\" id=\"drf-bb-panel3\"\u003e\n    \u003ch2\u003eHow to use Bloom Booster: preparation, rates \u0026amp; timing\u003c\/h2\u003e\n    \u003cdiv class=\"drf-callout drf-callout-gold\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eJust add water — solution grade powder\u003c\/span\u003e\u003cp\u003eAdd the measured amount to water and stir briefly. The soluble fraction dissolves completely; the micronised fraction forms a fine, stable suspension. Mix fresh for each application — don't store the diluted solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\n    \u003ch3\u003eApplication rates by plant\u003c\/h3\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eTomatoes, chillies \u0026amp; peppers\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ½ teaspoon (approx. 2.5g) per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly from first flower through fruit set\u003c\/div\u003e\n\u003cp\u003eStart the day the first truss sets flower and continue through harvest for consistent fruit development.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eRoses \u0026amp; flowering shrubs\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ¼–½ teaspoon per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks through each flush\u003c\/div\u003e\n\u003cp\u003eTimed to bud formation for stronger blooms and better colour through each flowering flush.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eStrawberries \u0026amp; soft fruit\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ¼ teaspoon per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Weekly from flowering to fruiting\u003c\/div\u003e\n\u003cp\u003eSupports fruit size and yield through the flowering-to-fruiting window.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eAnnuals \u0026amp; bedding plants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ¼ teaspoon per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2 weeks through the flowering season\u003c\/div\u003e\n\u003cp\u003eExtends the flowering display and keeps colour going through the season.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eOrchids \u0026amp; container flowering plants\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ⅛ teaspoon (approx. 0.5g) per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e Every 2–4 weeks when in bud\u003c\/div\u003e\n\u003cp\u003eA gentle rate suited to sensitive container plants and orchid roots.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-rate\"\u003e\n\u003ch4\u003eFruit trees\u003c\/h4\u003e\n\u003cdiv class=\"drf-rate-meta\"\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e ½ teaspoon per litre  |  \u003cstrong\u003eFrequency:\u003c\/strong\u003e At blossom and again at early fruit set\u003c\/div\u003e\n\u003cp\u003eTwo well-timed applications in spring support blossom retention and early fruit set.\u003c\/p\u003e\n\u003c\/div\u003e\n\n    \u003ch3\u003eStep-by-step preparation\u003c\/h3\u003e\n    \u003col class=\"drf-steps\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMeasure the powder.\u003c\/strong\u003e ¼ teaspoon (approx. 1g) per litre for sensitive plants, up to ½ teaspoon (approx. 2.5g) for heavy fruiters like tomatoes.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdd to water and stir.\u003c\/strong\u003e The soluble fraction dissolves within seconds; the micronised fraction forms a fine suspension.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eApply as a root drench.\u003c\/strong\u003e Saturate the root zone; for containers, apply until a little runs through the drainage holes.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eUse fresh.\u003c\/strong\u003e Mix only what you need — don't store the diluted solution.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\n    \u003cdiv class=\"drf-callout drf-callout-dark\"\u003e\n\u003cspan class=\"drf-callout-title\"\u003eWhen timing matters more than schedule\u003c\/span\u003e\u003cp\u003eUse the granular \u003cstrong\u003eBloom Fertiliser 2-8-4\u003c\/strong\u003e as the background feed for a flowering or fruiting bed. Reach for Bloom Booster at the specific moment a plant sets its first flower — that's the trigger to switch — and keep applying through fruit set. Getting the timing right does more for flowering and fruit than an early or extra granular application.\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\u003cp\u003eSwitch to Bloom Booster from \u003cstrong\u003eAll-Purpose Booster 5-5-5\u003c\/strong\u003e the moment first flower appears. Use alongside the granular \u003cstrong\u003eBloom Fertiliser 2-8-4\u003c\/strong\u003e as the base feed, with Booster as the liquid top-up through the flowering and fruiting window. Add \u003cstrong\u003eSeaweed Powder\u003c\/strong\u003e to the same watering can to help reduce flower and fruit drop under stress.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panel\" id=\"drf-bb-panel4\"\u003e\n    \u003ch2\u003eThe science of fast-release feeding: why a soluble drench and a slow-release granular are not interchangeable\u003c\/h2\u003e\n    \u003ch3\u003eTwo release curves, two jobs\u003c\/h3\u003e\n    \u003cp\u003eA granular fertiliser like Bloom Fertiliser 2-8-4 is built to be slow. Its minerals are sized so that soil moisture and microbial activity break them down gradually over weeks, releasing a steady trickle of phosphorus and potassium that a bed can draw on through the season. That's the right behaviour for background feeding — but the release curve is fixed the moment the granules go down. It can't respond to the exact day a plant sets its first flower.\u003c\/p\u003e\n    \u003cp\u003eBloom Booster inverts that curve deliberately. Every input is chosen to dissolve or break down within hours to days: amino acid nitrogen and Sulphate of Potash go into solution completely; the micronised rock phosphate, gypsum and Kieserite are milled fine enough to behave as near-soluble. The result is a feed you apply \u003cem\u003ebecause\u003c\/em\u003e a plant has just crossed into flowering, not on a fixed calendar.\u003c\/p\u003e\n    \u003chr class=\"drf-sep\"\u003e\n    \u003cdiv class=\"drf-compare\"\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eGranular 2-8-4 — steady background supply\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eRelease rate fixed by particle size and soil biology at the time of application\u003c\/li\u003e\n          \u003cli\u003eOne application covers the whole bed for weeks\u003c\/li\u003e\n          \u003cli\u003eCannot be timed to the exact day a plant sets flower\u003c\/li\u003e\n          \u003cli\u003eBuilds a standing reserve in the soil\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"drf-compare-box\"\u003e\n        \u003ch4\u003eBloom Booster — on-demand pulse\u003c\/h4\u003e\n        \u003cul\u003e\n          \u003cli\u003eRelease rate is hours, regardless of soil biology\u003c\/li\u003e\n          \u003cli\u003eApplied in direct response to first flower and fruit set\u003c\/li\u003e\n          \u003cli\u003eCan be layered on top of a granular feed without disrupting it\u003c\/li\u003e\n          \u003cli\u003eNo standing reserve — nutrients are used or leached within days\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003chr class=\"drf-sep\"\u003e\n    \u003ch3\u003eWhy sulphate of potash matters more in a bloom formula\u003c\/h3\u003e\n    \u003cp\u003ePotassium regulates the movement of sugars into developing fruit and governs fruit quality, firmness and colour — arguably the nutrient with the most direct effect on the finished crop in a bloom feed. The mineral this formula used previously was micronised but still part of the slower-breaking fraction. Sulphate of Potash is a genuinely soluble salt, so switching to it puts the full potassium supply into solution alongside the phosphorus, meaning both arrive at the root zone together at the moment they're needed most.\u003c\/p\u003e\n    \u003ch3\u003eFive mechanisms of action\u003c\/h3\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e01\u003c\/span\u003e\u003ch4\u003ePhosphorus for Flower \u0026amp; Root Development\u003c\/h4\u003e\n\u003cp\u003ePhosphorus is central to the energy transfer (ATP) that drives cell division in developing flower buds and roots — the reason this formula leads with it.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e02\u003c\/span\u003e\u003ch4\u003eSoluble Potassium for Fruit Quality\u003c\/h4\u003e\n\u003cp\u003ePotassium activates the enzymes that load sugars into fruit and regulates stomatal function, affecting firmness, sweetness and colour. Delivering it in fully soluble form means it's available exactly when fruit is filling.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e03\u003c\/span\u003e\u003ch4\u003eSulphur From Two Mineral Sources\u003c\/h4\u003e\n\u003cp\u003eSulphate of Potash and Kieserite both carry sulphur alongside their headline nutrient — a component of several enzymes and of chlorophyll synthesis, easy to under-supply in a simple N-P-K view of feeding.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e04\u003c\/span\u003e\u003ch4\u003eFulvic Acid Chelation \u0026amp; Membrane Transport\u003c\/h4\u003e\n\u003cp\u003eFulvic acid wraps mineral nutrients in a form that resists binding to soil particles and increases root cell membrane permeability, improving uptake of the phosphorus and potassium this formula relies on.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-mech\"\u003e\n\u003cspan class=\"drf-mech-num\"\u003e05\u003c\/span\u003e\u003ch4\u003eCalcium \u0026amp; Magnesium Alongside Fast Phosphorus\u003c\/h4\u003e\n\u003cp\u003eFast-developing fruit has a high calcium demand — a shortfall shows as blossom end rot in tomatoes — while magnesium sits at the centre of the chlorophyll molecule. Micronised gypsum and Kieserite are included to keep pace with the phosphorus-driven fruiting response.\u003c\/p\u003e\n\u003c\/div\u003e\n\n    \u003cdiv class=\"drf-refs\"\u003e\n\u003ch4\u003eScientific References\u003c\/h4\u003e\n\u003col\u003e\n      \u003cli\u003eMarschner, H. (2012). \u003cem\u003eMineral Nutrition of Higher Plants\u003c\/em\u003e (3rd ed.). Academic Press.\u003c\/li\u003e\n      \u003cli\u003eTaiz, L. \u0026amp; Zeiger, E. (2015). \u003cem\u003ePlant Physiology and Development\u003c\/em\u003e (6th ed.). Sinauer Associates.\u003c\/li\u003e\n      \u003cli\u003eHo, L.C. \u0026amp; White, P.J. (2005). A cellular hypothesis for the induction of blossom-end rot in tomato fruit. \u003cem\u003eAnnals of Botany\u003c\/em\u003e, 95(4), 571–581.\u003c\/li\u003e\n      \u003cli\u003eCanellas, L.P. \u0026amp; Olivares, F.L. (2014). Physiological responses to humic substances as plant growth promoters. \u003cem\u003eChemical and Biological Technologies in Agriculture\u003c\/em\u003e, 1(1), 3.\u003c\/li\u003e\n      \u003cli\u003eShukla, P.S. et al. (2019). Ascophyllum nodosum-based biostimulants. \u003cem\u003eFrontiers in Plant Science\u003c\/em\u003e, 10, 655.\u003c\/li\u003e\n      \u003cli\u003eLambers, H. et al. (2006). Root structure and functioning for efficient acquisition of phosphorus. \u003cem\u003eAnnals of Botany\u003c\/em\u003e, 98(4), 693–713.\u003c\/li\u003e\n    \u003c\/ol\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"drf-panel\" id=\"drf-bb-panel5\"\u003e\n    \u003ch2\u003eFrequently asked questions about Bloom Booster\u003c\/h2\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq1\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq1\"\u003eWhy use Bloom Booster instead of the granular Bloom Fertiliser 2-8-4?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThey do different jobs. The granular 2-8-4 breaks down over weeks and is the steady background feed for a flowering or fruiting bed. Bloom Booster dissolves within hours and is for the specific moment a plant crosses into flowering — a granular can't respond to that exact day. Use the granular on schedule and the Booster from first flower onward; they're not competing for the same job.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq2\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq2\"\u003eWhen exactly should I start using Bloom Booster?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eAt first flower — the moment a plant sets its first bud. That's the trigger to switch from a nitrogen-led feed (or All-Purpose Booster 5-5-5) to Bloom Booster, and to keep applying through fruit set.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq3\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq3\"\u003eWhat changed with the potassium source, and does it matter?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eThe previous formula used a micronised potassium mineral, part of the slower-breaking fraction. Sulphate of Potash is a genuinely soluble salt, so the whole potassium supply — the nutrient most directly linked to fruit quality and colour — now dissolves alongside the phosphorus instead of being split across two release speeds. It's also chloride-free and brings a useful dose of sulphur with it.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq4\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq4\"\u003eWhat is Kieserite, and why replace Epsom salt with it?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eKieserite is a naturally mined magnesium sulphate mineral, roughly 25% MgO and 50% SO₃. It sits alongside the gypsum and rock phosphate as a mined mineral input rather than a refined salt, and contributes further sulphur to the feed. The magnesium content and role in the formula are unchanged.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq5\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq5\"\u003eWhy is the nitrogen so low compared to All-Purpose Booster?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eNitrogen drives leafy growth, which competes with flowering and fruiting for the plant's resources. Bloom Booster's 2-10-5 ratio deliberately keeps nitrogen low and leads with phosphorus, to push energy towards flowers and fruit rather than more leaf.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq6\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq6\"\u003eMy tomato plant is leafy but won't flower — will this help?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eOften, yes. Excess nitrogen relative to phosphorus is a common cause of a leafy plant that won't set flower. A drench of Bloom Booster shifts that balance and typically shows a response within one to two weeks.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq7\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq7\"\u003eCan I use it on roses and ornamental flowers, not just fruiting crops?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. The same fast phosphorus-and-potassium profile that supports fruit set also supports bud formation and flower colour in roses and other ornamentals — apply every two weeks through each flowering flush.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq8\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq8\"\u003eWhy does it contain calcium and magnesium as well as NPK?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eDeveloping fruit has a high calcium demand — a shortfall shows up as blossom end rot in tomatoes — and magnesium sits at the centre of chlorophyll. The micronised gypsum and Kieserite keep pace with the phosphorus-driven fruiting response.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq9\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq9\"\u003eIs it safe for orchids and other sensitive container plants?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes, at the lower rate (⅛ teaspoon per litre). The gentle amino acid nitrogen and balanced mineral profile suit sensitive root systems.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq10\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq10\"\u003eIs it a replacement for a bottled liquid tomato feed?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eIt does the same job more efficiently. Bottled liquid feeds are typically 85–95% water by weight, so you're paying to ship water and a plastic bottle. Bloom Booster is a concentrated powder — you add the water at home.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq11\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq11\"\u003eCan I mix it with other Dr Forest products?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eYes. It's designed to sit alongside a granular base feed such as Bloom Fertiliser 2-8-4, and combines well with Seaweed Powder in the same watering can.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"drf-faq\"\u003e\n\u003cinput type=\"checkbox\" id=\"drf-bb-faq12\"\u003e\u003clabel class=\"drf-faq-q\" for=\"drf-bb-faq12\"\u003eHow should I store it?\u003c\/label\u003e\u003cdiv class=\"drf-faq-a\"\u003e\u003cdiv\u003eKeep the dry powder sealed in a cool, dry place away from direct sunlight and moisture. If it absorbs moisture and clumps, it's still usable — break up the clumps and measure as normal. Don't pre-mix and store the diluted solution.\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"Dr Forest","offers":[{"title":"500g","offer_id":58826772939126,"sku":"DRF-BB2105-500G","price":12.0,"currency_code":"GBP","in_stock":true},{"title":"1.5kg","offer_id":58826772971894,"sku":"DRF-BB2105-1.5KG","price":27.5,"currency_code":"GBP","in_stock":true},{"title":"3kg","offer_id":58826773004662,"sku":"DRF-BB2105-3KG","price":50.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0049\/8194\/8504\/files\/2-10-5.png?v=1790458898","url":"https:\/\/www.drforest.co.uk\/products\/organic-bloom-booster-2-10-5-solution-grade-powder-dr-forest","provider":"Dr Forest","version":"1.0","type":"link"}