Preen 24-64026 Lawn Weed Control Plus Crabgrass Preventer, 18 lb bag covers 5,000 sq.ft. Kills 200+ tough weeds commonly found in lawns Prevents crabgrass and other undesirable annual grasses all season long Kills dandelion, chickweed, white clover, poa annua, and foxtail weeds in lawn when used as directed Provides up to 5 months of weed control Apply in spring or fall