Mills Nutrients

Mills Nutrients comes from the Netherlands with a reputation that speaks for itself — a premium, ultra-clean mineral nutrient system used by some of the most demanding professional growers in Europe. Mills products are formulated using the highest pharmaceutical-grade mineral sources, producing a crystal-clear, highly stable nutrient solution with no precipitates, no sediment and no compromises. At The Horticulture Company, we stock the core Mills range for UK growers who prioritise quality above all else.
Mills Basis A&B and Start-R
Mills Basis A&B is the foundation of the system — a two-part base nutrient that delivers all macro and micro-elements in fully chelated, immediately available form. The pharmaceutical-grade mineral sources provide outstanding stability across a pH range of 5.5–6.5, making it equally effective in hydroponic, coco and soil environments. The high concentration of Basis A&B means bottles last significantly longer than many competitors despite the premium price point.
Start-R is Mills’ root stimulator and early vegetative additive, providing vitamins B1, B2 and natural plant hormones that accelerate root establishment in cuttings and seedlings. Applied from propagation through the first two weeks of vegetative growth, Start-R delivers a noticeably faster transition from cutting to established vegetative plant.
Mills Ultimate PK — The Flagship Booster
Ultimate PK is the product that put Mills Nutrients on the map. Applied from week 3 of flowering at progressively increasing doses, Ultimate PK delivers a highly refined phosphorus and potassium input that drives dramatic flower swelling and structural density. The pharmaceutical-grade potassium phosphate sources used in Ultimate PK are notably cleaner than the potassium hydroxide-based alternatives used in cheaper PK products — producing measurably cleaner-burning results.
We have been supplying Mills Nutrients to discerning UK growers since 2017. Browse the full Mills range below.