Ultimate PK Gives You Bigger and Better Fruits Ultimate PK is a heavyweight PK booster that contains high levels of phosphorus and potassium - two crucial macronutrients that are required in greater quantities during the bloom phase. When used in the last 2-4 weeks of the bloom cycle, this booster will enhance fruit quality and yield, while maintaining root health. How Ultimate PK Works Mills Ultimate PK uses clean and super soluble mineral salts, that are less likely to leave residues and cause blockages. This makes Ultimate PK a great choice for pretty much any growing medium or grow system, whether you're using soil, coco or hydroponic media. These minerals are also highly available to plants, which helps to ensure that as much phosphorus and potassium is uptaken as possible, at a time when plants depend on it. This all leads to incredible fruit production, which is why Ultimate PK (along with the rest of the Mills range) is so popular. Use C4 (another PK booster) from week three to week six. Use Ultimate PK from week six onwards and stop at the final flush. See the feed chart in the downloads section for more information.
