{"product_id":"mills-nutrients-c4","title":"Mills Nutrients - C4","description":"\u003csection class=\"gh-product-listing\"\u003e\n\u003ch2\u003eMills Nutrients C4 — Bloom Stimulator for Early-to-Mid Flowering\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers wanting a proper bloom booster that works from week 2 of flowering without breaking the budget\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\u003eC4 is one of those bloom additives that actually delivers. Mills have built a reputation on doing the basics brilliantly, and this sits right in that sweet spot — a carbohydrate and bio-stimulant blend that triggers flower development without premium pricing. One we recommend a lot for growers moving into the flowering phase.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eMills C4 is a \u003cstrong\u003ebloom stimulator and carbohydrate additive\u003c\/strong\u003e designed to support your plants during the critical early-to-mid flowering stage. Unlike pure PK boosters that just hammer phosphorus and potassium, C4 works differently — it delivers a sophisticated blend of sugars, amino acids, humic acids, and bio-stimulants that trigger flower production, encourage denser blooms, and boost the plant's natural essential oil output. Use it from week 2 of flowering through to week 6, and you'll see quicker fruit set, heavier yields, and noticeably better quality.\u003c\/p\u003e\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eC4 sits in the \u003cstrong\u003ehybrid bloom booster\u003c\/strong\u003e category — neither a pure PK booster nor a late-stage hardener.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWorks alongside your base nutrients (Basis A \u0026amp; B) rather than replacing them — it alters the NPK ratio to favour flowering\u003c\/li\u003e\n\u003cli\u003eEarly-to-mid phase focus means you'll transition to a finisher like Mills Ultimate PK from week 6 onwards\u003c\/li\u003e\n\u003cli\u003eCarbohydrate-driven approach mimics how premium brands like Advanced Nutrients work, but at significantly better value\u003c\/li\u003e\n\u003cli\u003eOrganic-derived formula plays well with beneficial biologics and works across soil, coco, and hydro systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn short: you're getting professional-grade bloom stimulation at mid-tier pricing, not premium markup.\u003c\/p\u003e\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eC4 is highly concentrated, so a little goes a long way. Start low, work up, and watch how your plants respond.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStandard application\u003c\/strong\u003e\u003cbr\u003eUse from week 2 of flowering at \u003cstrong\u003e0.5 ml per litre of water\u003c\/strong\u003e, increasing gradually to \u003cstrong\u003e1.5 ml per litre\u003c\/strong\u003e as you move through the mid-flowering phase. Alternatively, dose at 4–8 ml per gallon from week 2 through week 6.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntegration with Mills base nutrients\u003c\/strong\u003e\u003cbr\u003eC4 is designed to work alongside Mills Basis A \u0026amp; B. When combined, it shifts the overall NPK balance to favour flowering and fruit production. If you're running Mills as your base, C4 becomes the bloom trigger; if you're on another brand, just run it as your standalone bloom additive during this window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTransition to finishing phase\u003c\/strong\u003e\u003cbr\u003eRun C4 through week 6 of flowering, then switch to Mills Ultimate PK for the final weeks. This two-stage approach mirrors how the plant naturally shifts its priorities — early blooming, then hardening and ripening.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible across all systems\u003c\/strong\u003e\u003cbr\u003eWorks equally well in hand-watered soil, coco drip systems, deep water culture, or NFT — no special considerations needed.\u003c\/p\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduct type: \u003cstrong\u003eLiquid bloom stimulator and carbohydrate additive\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eComposition: \u003cstrong\u003eMacro and micronutrients, bio-stimulants, complex sugars, amino acids, humic acids, and trace minerals\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFormat: \u003cstrong\u003eHeavy-duty polyethylene jerrican with collapsible handles and dual twist-top pour\/vent system\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: \u003cstrong\u003e1L (hobby), 5L, 10L, 20L, 60L, 200L, and larger commercial volumes\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eConcentration: \u003cstrong\u003eHighly concentrated — only 0.5–1.5 ml per litre required\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eClassification: \u003cstrong\u003ePredominantly organic-sourced, zero biological activity\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApplication window: \u003cstrong\u003eWeek 2 through week 6 of flowering\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatibility: \u003cstrong\u003eAll growing media and watering systems; designed to work with Mills Basis A \u0026amp; B\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\u003eGrowers entering the flowering phase for the first time who want straightforward, proven results\u003c\/li\u003e\n\u003cli\u003eExperienced growers building a complete Mills nutrient regimen for consistency and synergy\u003c\/li\u003e\n\u003cli\u003eAnyone running multiple plants or rooms where bloom booster costs add up — better value than premium alternatives\u003c\/li\u003e\n\u003cli\u003eGrowers running soil, coco, or hydro systems who need a universal bloom additive that plays well with biologics\u003c\/li\u003e\n\u003cli\u003eThose chasing denser, heavier blooms with richer aromatic profiles without guessing which product to use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eParticularly well suited to setups where \u003cstrong\u003eproven results and straightforward integration matter more than brand hype\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eC4 is a proper bloom stimulator at a price that makes sense. Mills have been doing this for years — started in Holland, now manufactured there too — and they've dialled in a formula that works. The bio-stimulants trigger the plant to produce more essential oils and sugars, the carbohydrates support flower development, and the whole thing plays nicely with everything else you're running.\u003c\/p\u003e\n\u003cp\u003eIf you're planning your flowering phase and want a bloom booster that delivers without the premium markup, worth picking up while stock lasts. Does exactly what it should, week after week.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"MILLS","offers":[{"title":"250mls","offer_id":47916341952682,"sku":"762230","price":20.99,"currency_code":"GBP","in_stock":true},{"title":"1 Litre","offer_id":47916341985450,"sku":"762240","price":49.99,"currency_code":"GBP","in_stock":false},{"title":"5 Litre","offer_id":47916342018218,"sku":"762250","price":179.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/mills_nutrients_c4_1_litre.jpg?v=1769191769","url":"https:\/\/growershouse.co.uk\/products\/mills-nutrients-c4","provider":"Growers House ","version":"1.0","type":"link"}