Ortho WeedClear Fast Acting Lawn Weed Killer Spray, 24 oz. effectively eliminates a wide variety of weeds without damaging your lawn when used as directed. This fast-acting formula becomes rainproof in just one hour and delivers visible results after a single application. It targets over 200 types of weeds, including dandelion, chickweed, clover, crabgrass, and foxtail, eradicating them down to the roots. Suitable for use on various grasses such as Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass, this weed killer is applied when weeds are small and actively growing during the spring or fall. For optimal crabgrass control, apply in the spring before it reaches 4 inches tall or as soon as it appears in your lawn. Model Number: