The Flora Series is a three-part building block system that enables you to custom-blend a formula based on type of plant and phase of growth. The Flora Series provides a unique combination of mineral nutrients and state-of-the-art organic chelates developed by Dr. Cal Herrmann of the University of California Water Technology Center. Mix special formulas for starting cuttings or seedlings, foliar feeding or other specialized needs. Excellent for use in all growing media, including rockwool, Hydroton clay aggregate, soil and aeroponics. Indoors or out, for the beginning or advanced customer. Check out the new GH feeding schedules to maximize nutrient use. Specially formulated for water sources with greater than 75 ppm of calcium.