Achieve Heavier, Denser Blooms with Advanced Nutrients HammerHead Advanced Nutrients HammerHead is a bloom-phase PK additive designed to deliver targeted support during the mid-to-late flowering stages. With a 0-4-12 NPK ratio, it promotes fuller, heavier flowers without unbalancing your nutrient programme. Free from nitrogen and made with clean, highly available inputs, HammerHead supports dense flowering while maintaining excellent root zone health. Please note: The 5 Litre Hammerhead is purchased to order, so extended lead times will apply. Key Features: 0-4-12 NPK – Encourages flower stacking and weight gain No Nitrogen – Helps prevent leafy growth and nutrient overload in bloom Potassium Citrate – A cleaner, more bioavailable form of potassium pH Perfect® – Integrates smoothly with Advanced Nutrients systems Fully Soluble – Won't clog drippers or lines Why Use Advanced Nutrients HammerHead? Unlike generic bloom boosters, HammerHead is formulated with a precise 1:3 PK ratio designed specifically for high-value crops. It uses potassium citrate instead of sulfate of potash, helping plants absorb what they need more efficiently without causing phosphorus toxicity. The nitrogen-free formula also makes it safer to run through late flower without compromising quality. While it pairs best with the Sensi Terra™ Series, HammerHead is fully compatible with all Advanced Nutrients base feeds — and most other brands too. How to Use Advanced Nutrients HammerHead: Use at 2ml per litre from week 3 to week 7 of flowering. Add it after your base nutrient and mix thoroughly. Works especially well when used alongside Big Bud during early flower and Overdrive in the final weeks. No need to adjust pH when used with other Advanced Nutrients products.
