Natural bacteria controls grub state of Japanese beetles. Easy to apply using a drop spreader for complete coverage. Remains dormant in soil until grubs begin feeding on grass roots to ingest it. Spore begins to multiply after ingested, killing grub from within. Will not harm humans, pets, shrubs, beneficial insects, or the environment. Safe for use around wells, ponds, and streams. Apply in spring, summer, and fall for 2 consecutive years. 10 year performance guarantee after final application. Apply any time ground is not frozen. OMRI (Organic Materials Review Institute).