{"product_id":"mills-nutrients-ultimate-pk","title":"Mills Nutrients - Ultimate PK","description":"\u003csection class=\"gh-product-listing\"\u003e\n\u003ch2\u003eMills Nutrients Ultimate PK — Phosphite-Based Bloom Booster for Final Weeks Flowering\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers pushing the finishing phase and wanting denser cell structure, richer flavour, and heavier yields in the last 2-4 weeks of bloom\u003c\/p\u003e\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003eMills Ultimate PK does one job exceptionally well — it hardens and finishes your crop when it matters most. Phosphite-based formula means better bioavailability than standard PK products, and it won't accumulate in your medium. Proper kit for the final sprint.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eMills Nutrients Ultimate PK is a \u003cstrong\u003ephosphite-based PK bloom booster\u003c\/strong\u003e designed specifically for the final 2-4 weeks of the flowering phase. It's a heavyweight finisher that works on top of your base feed to drive harder cell structure, richer aromatic compounds, and superior yield in the closing stages of growth. The phosphite formulation — a highly bioavailable form of phosphate — ensures your plants get exactly what they need when they need it most, without the nutrient lockup you'd risk with cheaper alternatives.\u003c\/p\u003e\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eUltimate PK sits in the \u003cstrong\u003efinishing booster bracket\u003c\/strong\u003e — designed for late-stage bloom, not early flowering acceleration.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePhosphite formula offers superior bioavailability vs standard phosphate-based PK boosters\u003c\/li\u003e\n\u003cli\u003eWon't accumulate in your medium — Mills bio-mineral philosophy keeps things clean\u003c\/li\u003e\n\u003cli\u003eNarrower application window (weeks 5-8) than broad-spectrum boosters, which means more targeted results\u003c\/li\u003e\n\u003cli\u003eMid-premium pricing with technical formulation to back it up\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn short: you're paying for precision, not just a generic PK bump. Works best alongside Mills' base range (Basis A+B, C4) but compatible with any nutrient line.\u003c\/p\u003e\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eUltimate PK is a supplement — it stacks on top of your regular base feed, not instead of it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLate-stage finishing (weeks 5-8 of flowering)\u003c\/strong\u003e\u003cbr\u003eIntroduce at 2 ml per litre in week 5, increasing to 2.5 ml per litre from week 7 onwards. Most growers see best results starting week 5 and running through to final flush.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntegration with base nutrients\u003c\/strong\u003e\u003cbr\u003eWhen you introduce Ultimate PK, dial back your base feed slightly to prevent nutrient burn. Mills products work as a system, so if you're running Basis A+B, reduce those slightly and add Ultimate PK to the mix. The NPK ratio (0-7-6) means zero nitrogen — it's pure phosphorus and potassium, designed to complement, not replace.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWatering method compatibility\u003c\/strong\u003e\u003cbr\u003eWorks seamlessly across hand watering, drip systems, and run-to-waste setups. No special prep needed. Mix into your water reservoir as normal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRoot health bonus\u003c\/strong\u003e\u003cbr\u003ePhosphite also improves oxygen flow to roots and acts as a natural root cleaner, so you're getting secondary benefits beyond just the bloom finish.\u003c\/p\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNPK Ratio: \u003cstrong\u003e0-7-6\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eActive ingredient: \u003cstrong\u003ePhosphite (bioavailable phosphate)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eChelated micronutrients: \u003cstrong\u003eYes — optimised for plant absorption\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDosage: \u003cstrong\u003e2-2.5 ml per litre (weeks 5-8 of flowering)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAlternative imperial dosing: \u003cstrong\u003e8 ml per gallon (weeks 2-4 of bloom phase)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMedium compatibility: \u003cstrong\u003eAll growing mediums (coco, soil, clay pebbles, rockwool, etc.)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFormat: \u003cstrong\u003eLiquid concentrate\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eContainer: \u003cstrong\u003eHeavy-duty polyethylene jerrican with collapsible handles and dual twist tops\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: \u003cstrong\u003e1L hobby to 1000L commercial\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAccumulation: \u003cstrong\u003eBio-mineral formula — no residual buildup in medium\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLate-bloom specialists who want to squeeze maximum density and flavour in the final push\u003c\/li\u003e\n\u003cli\u003eGrowers already running Mills base nutrients and looking to complete the system\u003c\/li\u003e\n\u003cli\u003eAnyone running hydro or coco who needs precise nutrient timing without guesswork\u003c\/li\u003e\n\u003cli\u003eSerious home growers and commercial setups where yield and quality matter equally\u003c\/li\u003e\n\u003cli\u003eGrowers who've had nutrient burn issues — Mills' reduction-compatible approach is safer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eParticularly well suited to growers who understand that \u003cstrong\u003ethe last 2-4 weeks make or break the entire crop\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eUltimate PK does what a good finishing booster should do — it hardens your foliage, drives richer aromatics, and pushes yield without overcomplicating your feed schedule. The phosphite formulation is the real win here; it's a level above generic PK products and growers notice the difference.\u003c\/p\u003e\n\u003cp\u003eWorth picking up if you're serious about the finishing phase. Apply it right, dial back your base feed, and let it work. Good time to buy while clearance stock lasts.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"MILLS","offers":[{"title":"1 Litre","offer_id":47916342280362,"sku":"762270","price":49.99,"currency_code":"GBP","in_stock":true},{"title":"5 Litre","offer_id":47916342313130,"sku":"762280","price":179.99,"currency_code":"GBP","in_stock":true},{"title":"250ml","offer_id":47916342345898,"sku":"762260","price":20.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/mills_nutrients_ultimate_pk_1_litre.jpg?v=1769191779","url":"https:\/\/growershouse.co.uk\/products\/mills-nutrients-ultimate-pk","provider":"Growers House ","version":"1.0","type":"link"}