Use Ortho® GroundClear® Weed & Grass Killer Super Concentrate1 to kill 175 different weed and grass types including crabgrass, dandelion, nutsedge, and oxalis. The quick-kill, dual-action formula starts working immediately as one ingredient kills on contact while the other penetrates deep into the plant to kill all the way down to the roots. Sprayed weeds usually begin to wilt within hours after being treated, with weeds completely killed in 1 to 2 weeks. Achieve maximum weed control with this weed and grass killer around landscape areas, patios, walkways and driveways. A single application controls most listed weeds. Rainfall or watering 15 minutes after application will not reduce the effectiveness of this powerful weed control. Easily apply to weeds and unwanted grasses with an Ortho tank sprayer. When mixed as directed, 5 fl. oz. combined with 1 gallon of water will cover up to 350 sq. ft.