Ortho GroundClear Year Long Vegetation Killer2 Concentrate kills weeds, grasses and existing vegetation, and prevents regrowth for up to 1 yearThe fast-acting weed killer starts working immediately and is rainproof in 1 hourUse this weed control product where no plant growth is wanted for at least a year on driveways, sidewalks, fence lines, paver patios, walkways, gravel areas, parking areas, and other hardscapesApply this weed killer concentrate by mixing 24 fl. oz. per gallon of water and using a tank sprayerOne 2 gal. container of Ortho GroundClear Year Long Vegetation Killer2 Concentrate makes enough product to treat up to 3,200 sq. ft.