The dual action formula of Ortho GroundClear Weed and Grass Killer Super Concentrate1 kills even the toughest types of weeds and grasses by working on contact for fast results while moving down to the roots. FAST-ACTING: Weeds start to wilt within hours and completely die in 1-2 weeks with this quick kill formula that is rainfast 15 minutes after it's applied. MAXIMUM CONTROL: This product starts to work on contact as it is absorbed into the plant and works through its system to kill weeds right down to the root. EASY TO APPLY: Mix concentrate with water in a tank sprayer to treat landscape areas, patios, walkways, and driveways. MAXIMUM COVERAGE: A little concentrate provides a large area of coverage as just 5 fl. Oz.