Advanced Nutrients Bloom Booster is a superior bloom enhancer that can be used in conjunction with AN bloom products and regular feed programs. This product was engineered from the ground up. Bloom Booster blends four very specific bloom-enhancing components. This costs more to produce, but AN wants you to have maximum success, and that's why they've designed this superior Bloom Booster formulation. If you want vigorous, well-formed flowers, fruits and vegetables, use Advanced Nutrients Bloom Booster.