Ortho GroundClear Weed & Grass Killer Super Concentrate1 kills the toughest weeds and grasses to the root. This weed control product starts working immediately to kill all types of weeds and grasses including clover, dandelion, oxalis, chickweed and crabgrass. In addition, it is rainfast 15 minutes after application. Use this weed control product around trees, shrubs and fences, and on patios, paths, sidewalks, sidewalk cracks, walkways, and driveways. To use, dilute this weed killer concentrate per label directions and apply with a tank sprayer. Spray weeds to thoroughly wet foliage, but not to the point of runoff. For best results, apply when weeds are actively growing and the air temperature is above 60F. Sprayed weeds begin to wilt hours after application, with complete kill within days to 1 to 2 weeks. People and pets may re-enter after the treated area has been allowed to dry. This 32 fl. oz. container of Ortho GroundClear Weed & Grass Killer Super Concentrate1 treats up to 1120 sq. ft. Trust Ortho to keep your landscape free of weeds and unwanted grasses.