ClassiCote with Crystal Green feeds your plants in a sustainable earth-friendly way utilizing a renewable, slowly available source of phosphorus and magnesium that would otherwise be lost as waste. Crystal Green, a highly pure, crystalline compound with innovative green technology that captures nutrients from wastewater. The controlled release nutrients are available to the plant in small increments giving time for absorption instead of washing away. This blend with enhanced micronutrients availability provides optimal nutrition for strong roots and vital green growth.