House & Garden Hydro-Nutrient A&B is a versatile 2-part nutrient solution formulated to provide plants with all the nutrients they need for strong and healthy growth. Can be used during the vegetative and bloom stages of the growing cycle. Specially designed for use with hydro-based substrates. Provides plants with vital nutrients such as phosphorus and potassium, allowing them to flourish and thrive. Improves nutrient uptake of the plant. Easy to use 2-part solution.