A great natural source for Magnesium and Calcium to prevent blossom-end rot. It helps retain moisture in your soil and encourages the growth of bacteria that control ants, grubs, fungus, and root nematodes. When placed around plants it repels slugs and snails and discourages moles and mice from digging up bulbs and root vegetables. Ideal for flowers, vegetables, and lawns. Kid and pet safe. Four pounds covers approximately 130 square feet.