Ortho® GroundClear® Weed & Grass Killer2 works fast to kill weeds and unwanted grasses, with results you can start to see in 15 minutes. This weed killer controls weeds like chickweed, algae, dandelion, ragweed, shepherd's purse, moss, mustards, oxalis, and others (as listed). It also controls grasses including crabgrass (large), bluegrass (annual), onion (wild), and perennial ryegrass. Apply this landscape weed control at any time of the year when weeds are small (3 inches tall or wide) and actively growing. This product is a concentrate. It cannot be applied directly out of its container. Mix 1 pint of concentrate with 7 pints of water and apply with a tank sprayer directly to weeds in patios and landscape beds. Treatments can also be made to walkways, driveways, and under trees. Weeds will turn from green to brown within 1-2 hours. Each 32 fl. oz. container contains enough weed killer to treat up to 600 sq. ft. Experience results quickly with Ortho® GroundClear® Weed & Grass Killer2.