Green Planet - Hydro Fuel Bloom is the bloom component of the Hydro Fuel 4-part base nutrient system, designed to allow for more control and intricacy in your feeding regimen during the flowering stage of growth. The Hydro Fuel base nutrient system provides a necessary differentiation between the grow and bloom cycles with 2 parts for the vegetative stage and 2 parts for the flowering stage. Hydro Fuel Bloom is part of the Hydro Fuel Feed Program.