Mills Ultimate PK – Phosphite Bloom Booster

A phosphite-based PK for a harder, heavier finish

Mills Ultimate PK is a phosphite-based bloom stimulator for the final stages of flowering. It works as a ripening hardener, driving up the production of essential oils as plants approach the end of flowering to secure a fuller, more complete finish. The phosphite form is quickly available to the plant, making it well suited to the tight window in the last weeks before the plain-water finish.

Key Benefits

• Phosphite-based formula - a fast, readily available form of PK for late-flower uptake.
• Increases yield - supports fuller, heavier flower development in the final weeks.
• Enhances flavour and aroma - lifts essential oil production for a stronger finish.
• Ripening hardener - firms and finishes flowers ahead of the plain-water finish.
• Improved plant quality - refines overall flower structure and character.

Flowers finishing soft or light?

Crops that stay soft or under-finished in the closing weeks usually need extra phosphite-based PK support rather than more base nutrient. Ultimate PK is timed for exactly that window, hardening and ripening flowers in the last stretch before the plain-water finish.

How to Use

• All media (late flower): 2ml per litre during the last 2-4 weeks of the flowering cycle, before the plain-water finish.
• Alongside base feed: add to your normal bloom nutrient solution.
• Plain water: discontinue and run plain water for the final days of flowering.
• Tip: check EC after adding, as the higher rate raises solution strength.