Mills C4 — Early-to-Mid Bloom Stimulator

Mills C4 — Advanced Bloom Stimulator for Early-to-Mid Flower Development

C4 is an advanced bloom stimulator designed to assist plants' delivery of carbohydrates, macronutrients, micronutrients, and trace minerals to developing flowers — facilitates the triggering and maturation of complex essential oils appropriate for early and mid stages of flower development. Used with Basis A&B, alters the NPK to higher phosphorus and potassium ratios. The flowering kick-starter for growers running the Mills programme.

Why growers choose Mills C4:

• Advanced bloom stimulator — biological complexity beyond simple PK boosters
• Carbohydrate delivery — energy supply for active flowering
• Triggers essential oil maturation — terpene and aroma compound development
• Used early-to-mid flower — covers the critical bloom-development window
• Alters NPK to higher P and K — when used with Basis A&B, shifts ratios for flowering
• Carries macros, micros, and trace minerals — broader support than narrow PK
• Pairs with Mills feeding programme — Basis, Vitalize, Start-R, Ultimate PK

Who it's not for:

An additive, not a base nutrient — use alongside Mills Basis A&B or other base nutrients. Specifically for early-to-mid flower; for late finishing (last 2-4 weeks), use Mills Ultimate PK instead. Stop 7-10 days before harvest for a proper flush. For broader bloom-stage stimulation outside the Mills ecosystem, Canna Boost Accelerator, Shogun Sumo Boost, or Buddha's Tree Meta-Boost are alternatives.

Available to collect from our Stone shop at Unit 24, Emerald Way, ST15 0SR — or ships the same working day from our UK warehouse. Not sure if this is the right fit? Give us a ring on 01785 556355 or email sales@roots2riches.com — we're growers ourselves, happy to help.