Garden Gypsum is the finest grade pelletized gypsum available. It is a natural, high purity mineral that provides valuable benefits to soils and plants. While not a fertilizer, it can help increase the productivity of all your gardening efforts. Loosens clay soils and helps improve water and air penetration. Aids in minimizing salt damage to plants. Helps promote root growth and maximizes fertilizer effectiveness. Ecologically safe, nontoxic, nonburning, safe for plants, pets, and people. USDA (United States Department of Agriculture) Certified Organic.