Kills the root. Results in 24 hours. Rainproof in 2 hours! Guaranteed results! Product facts: container treats more than 200 weeds. Kills dandelion, clover, chickweed and other broadleaf weeds - won't harm lawns. Where to use: on lawns - bahiagrass, bentgrass, Bermudagrass, buffalograss, centipedegrass, fescue, Kentucky bluegrass, perennial ryegrass, zoysiagrass and St. Augustinegrass (do not use on Floratam) without harming lawn grasses.