Ortho WeedClear Fast Acting Lawn Weed Killer Concentrate, 32 oz. is designed to effectively eliminate a wide variety of weeds without damaging your lawn when used as directed. This fast-acting formula becomes rainproof within just one hour and delivers visible results after a single application. It targets over 200 types of weeds, including common nuisances like dandelion, chickweed, clover, crabgrass, and foxtail, working down to the roots for thorough control. Suitable for use on popular grass types such as Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass, it is applied when weeds are small and actively growing during the spring or fall seasons. For optimal crabgrass control, apply in the spring before weeds reach 4 inches tall or as soon as they become noticeable in your lawn. Model Number: