Espoma® Organic Garden Gypsum is calcium sulfate which is a naturally occurring mineral that is considered a soil conditioner helping to loosen clay soil, and it minimizes salt damage to plants. Use it to mitigate burns in lawns from winter de-icers and pet damage or to improve the structure of heavy clay soils. Espoma® Organic Garden Gypsum is pelletized for easy application and can be used in garden beds, around flowers and shrubs and on lawns. Follow the application rate on the package.