Plagron Hydro (B)Hydro A & B Two component fertilizer for growth and flowering Hydro A & B is a highly concentrated two part hybrid mineral base nutrient, designed to achieve the growing and flowering phases of the plant. These two components of fertilizer are easy to use and include a balanced ratio of elements synthesized for optimal plant uptake. Hydro A & B is engineered specifically for cultivation in none soil systems and is applicable for all hydro methods.