Blossom Blaster™ Explosive Flower Development Blossom Blaster™ is a powerful blend of phosphorous and potassium fertilizers. Use Blossom Blaster to add size to your blossoms by adding it to your nutrient solution just before flowers are starting to form. It supplies the plant with a reliable source of nutrition in the area where buds are developing. Blossom Blaster gives high performance in all mediums. • use only 2x during flowering cycle • use only with change of nutrient Available in 20 g NPK: 0-39-25