Kills all types of weeds (as listed) without harming your lawn (when used as directed). The formula is rainproof in 1 hour and is fast-acting - you'll see results in just one application. It kills over 200 weeds down to the roots, including dandelion, chickweed, clover, crabgrass, and foxtail. For use on grasses, including Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass.