{"product_id":"mills-nutrients-ultimate-pk-advanced-phosphite-based-bloom-hardener-ripener","title":"Mills Nutrients - Ultimate PK – Advanced Phosphite-Based Bloom Hardener \u0026 Ripener","description":"\u003ch3\u003eMills Nutrients - Ultimate PK - Advanced Phosphite-Based Bloom Hardener\u003c\/h3\u003e\n\n\u003cp\u003eMills Ultimate PK is a highly specialised, professional-grade bloom stimulant designed to push crop production to its absolute limit during the final weeks of flower development. What sets Ultimate PK apart from traditional flowering additives is its unique, highly bioavailable Phosphite-based formulation. Unlike standard phosphate, Phosphite is an exceptionally rapid-absorbing form of Phosphorus that not only fuels explosive late-stage floral expansion but also actively promotes a healthy, resilient root system.\u003c\/p\u003e\n\n\u003cp\u003eThis dual-action pathway ensures optimal nutrient and water uptake when the plant's metabolic demands are at their highest. Engineered to act as a powerful bulker, hardener, and ripener, Ultimate PK packs dense weight onto flower structures and accelerates final oil and resin synthesis for an elite, high-value harvest. It is a clean-running, highly stable additive that provides the final mineral push required for a competition-grade finish in any growing medium.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cb\u003eBest For:\u003c\/b\u003e Hardening and tightening late-stage flower structures, maximising final fruit and bud weight, supporting root health and nutrient uptake during late bloom, and accelerating the ripening process.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eKey Features:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eAdvanced Phosphite Technology:\u003c\/b\u003e Utilises a highly stable and ultra-absorbable form of Phosphate that penetrates plant tissue rapidly, optimising systemic energy transfer and late-season vigour.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eLate-Stage Bud Hardener \u0026amp; Bulker:\u003c\/b\u003e Delivers a concentrated mineral boost during the critical final weeks of bloom, turning loose floral structures into compact, heavy, and rock-solid buds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eSystemic Root \u0026amp; Plant Health Support:\u003c\/b\u003e The unique phosphite structure helps stimulate natural defence systems and preserves root zone integrity, preventing late-cycle root decline.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eAccelerated Ripening \u0026amp; Sugar Translocation:\u003c\/b\u003e Speeds up the natural ripening phase, driving sugars and essential oils to flower sites for a highly aromatic, terpene-rich finish.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003ePerfect Synergy with Mills Basis:\u003c\/b\u003e Engineered to work seamlessly alongside Mills Basis A\u0026amp;B and other premium feeding programs without causing mineral lockouts or reservoir instability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eSpecifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left;\"\u003e\n  \u003ctr style=\"border-bottom: 1px solid #ccc;\"\u003e\n    \u003cth style=\"padding: 8px;\"\u003eFeature\u003c\/th\u003e\n    \u003cth style=\"padding: 8px;\"\u003eDetails\u003c\/th\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e\u003cb\u003eBrand\u003c\/b\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding: 8px;\"\u003eMills Nutrients\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e\u003cb\u003eProduct Type\u003c\/b\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding: 8px;\"\u003eLiquid Phosphite-Based Bloom Booster \u0026amp; Ripener\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e\u003cb\u003eApplication Phase\u003c\/b\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding: 8px;\"\u003eFinal Weeks of Flowering (typically the last 2 to 4 weeks)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e\u003cb\u003eCompatible Media\u003c\/b\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding: 8px;\"\u003eSoil, Coco Coir, Rockwool, and Hydroponics\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"border-bottom: 1px solid #eee;\"\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e\u003cb\u003eAvailable Sizes\u003c\/b\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding: 8px;\"\u003e1 Litre and 5 Litre\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cb\u003eIdeal For:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cb\u003eFinal Swell and Density Packing:\u003c\/b\u003e Introduce to your reservoir during the heaviest, final weeks of budding to maximise cell density, dry weight, and overall visual volume.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eCrop Quality \u0026amp; Terpene Boosting:\u003c\/b\u003e Run during the ripening stage to trigger maximum resin exudation and terpene synthesis, enhancing bag appeal and extraction quality.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cb\u003eAutomated Hydroponic Run-to-Waste:\u003c\/b\u003e Perfect for high-performance drip and recirculating systems where a highly stable, completely soluble PK additive is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eUsage Tip:\u003c\/b\u003e For a complete Mills flowering program, transition from Mills C4 to Ultimate PK around week 5 of the flowering cycle. The phosphites in Ultimate PK will help maintain root health during the period when plants are often most susceptible to root stress due to heavy nutrient loads.\u003c\/p\u003e","brand":"Holland Forge","offers":[{"title":"1L","offer_id":48374323904612,"sku":"4566","price":75.9,"currency_code":"AUD","in_stock":true},{"title":"5L","offer_id":48374323937380,"sku":"4567","price":318.9,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0713\/6487\/0244\/files\/ultpk1L_500x_11639160-be20-4a0f-8bbd-5caee3fdad07.jpg?v=1778054997","url":"https:\/\/www.greenhousepolytunnels.com.au\/products\/mills-nutrients-ultimate-pk-advanced-phosphite-based-bloom-hardener-ripener","provider":"Greenhouse \u0026 Polytunnels","version":"1.0","type":"link"}