Grow More's Mendocino Producer's Choice line of water soluble 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. This high nitrate formula is designed for cool temperature climates, dark weather or spring time, when plants need extra vigor and growth.