Bonide Crabgrass & Weed Preventer may be used for early season control of crabgrass and other broadleaf weeds. Pre-emergence activity keeps crabgrass and select broadleaves from germinating in established lawns and residential landscapes. Provides post-emergence control of seedling crabgrass after germination and emergence for up to 4 weeks. Easy granular formulation. Treats up to 5,000 square feet.