Growmore 13% Iron Chelate is a fully chelated, water soluble, powdered form of iron EDTA and is recommended for the prevention and correction of iron deficiency. It is recommended for use on acid and mildly alkaline soils. To insure uniform coverage, Growmore 13% Iron Chelate should be dissolved in water of liquid fertilizer, or dry blended with water soluble fertilizers. For individual plants, the chelate may be blended with an inert (such as soil or sand) or sprinkled directly on the soil uniformly under the dripline.