Mills Nutrients Ultimate PK, 20 LiterUltimate PK is an additive designed for blooming or flowering plants. Improves the cell structure of the plant and makes the taste and aroma of the fruits full, powerful and top class. C4 is an advanced bloom stimulator designed to assist the plants delivery of carbohydrates, macro and micronutrients, and trace minerals to developing flowers and facilitate the triggering and maturation of complex essential oils appropriate for the early and mid stages