Milky spore powder is a one-time application using the Lawn and Garden Dispenser (using Orgill item #908-8766) or teaspoon. Once applied, Milky Spore is a natural bacteria that eats the grub from the inside out. Once in the soil, it will remain dormant until grubs begin feeding on grass roots and ingest the bacteria. Does not harm man, pets, shrubs or beneficial insects. Can be applied anytime ground is not frozen to lawns, flower/mulch beds, gardens, recreational ornamental turfs and other grassy areas. OMRI certified for organic gardening. Developed by the USDA. Contains the active ingredient spores of bacillus popplliea.