Ortho 4613504 GroundClear Weed & Grass Killer, GallonOrtho GroundClear Weed and Grass Killer works fast to kill weeds and grasses, with results you can start to see in 15 minutes. To kill weeds on patios and landscape beds and experience results quickly. Highlights: Size: Gallon RTU Liquid Post emergent Rain proof Kill weeds and grasses Use directly on weeds on patios and in landscape beds Starts working immediately see results in 15 minutes Apply at any time of the year when weeds are small (3 inches