This three part series continues to be a big seller in the hydroponic industry. The flexibility to custom blend the formulas is an attractive benefit to beginners and experts alike. Great for all types of media/growing environments including rock wool, grow rocks, coco, soil, aeroponics, etc. Stimulates flower and fruit development. Enhances flavor, aroma and essential oils. Provides high phosphorous, potassium, magnesium and sulfur.