Ortho GroundClear Year Long Vegetation Killer1 is formulated to kill weeds and grasses and prevent new growth for up to 1 year. To use this concentrate, simply mix 24 fl. oz. with 1 gallon of water in a tank sprayer. Use on areas where weeds are not desired, including driveways, sidewalks, gravel areas, rock and desert landscapes, under decks, on parking areas, along fences and curbs and in unplanted areas. You'll see visible results in 3 hours with Ortho GroundClear Year Long Vegetation Killer1. Mix 24 fl. oz. with 1 gallon of water to cover up to 300 sq. ft. Each bottle creates 5.3 gallons of ready to use vegetation killer that can cover up to 1600 sq. ft.