Grow More's Mendocino Producer's Choice line of fertilizers are the most advanced powders we've ever created. They are 100% water soluble formulas containing a properly balanced mixture of all essential plant nutrients with quality-enhancing elements; calcium, magnesium, DTPA/EDDHA Iron, carbohydrates, amino acids and no artificial dyes or colorings. This Mendocino line provides highly efficient, performance nutrients as a standalone base nutrient or as a vegetative and bloom stimulant. For use in soilless, hydroponic, organic soils and coco coir systems. Special soluble non-acidifying sulfur provides increase in chlorophyll formation and availability of potassium. High rainfall or excessive irrigation can cause sulfur deficiencies. Magnesium helps transport phosphate in the plant and is essential in chlorophyll.