Ortho GroundClear Super Weed & Grass Killer1 kills the toughest weeds and grasses to the root so they don't come back. This weed control product absorbs on contact and 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. The trigger sprayer accurately targets weeds and grasses you want to kill. To apply, twist the nozzle to your desired spray pattern and begin spraying 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. Trust Ortho to keep your landscape free of weeds and unwanted grasses.