Dyna-Gro Bloom is a low nitrogen, high phosphorus concentrate containing all 6 essential macronutrients and all 10 essential micronutrients that every plant needs. Bloom is specifically formulated to encourage the development of large, vibrant blooms. Bloom supplies a balance of low ammonical to nitrate nitrogen needed to avoid stem elongation in flowering plants and vegetables. Apply bloom before flower buds appear to help initiate flowering.