House & Garden Top Booster is an extremely powerful flowering stimulator which will amaze the grower. Top Booster acts on the basis of PK13-14 but with the added benefits of Eddha-Fe (iron). The basis of all flowering boosters is a blend of pure potassium and phosphorus. These elements are important for the plant’s flowering process and create superior flowering sites. Potassium is for the beginning of the flowering stages and phosphorus is for the proper development of fruit and flowers, while the Eddha-Fe additive ensures a better colouring of the leaf.