Ortho® GroundClear Year Long Vegetation Killer is formulated to kill weeds and grasses and prevent new growth for up to 1 year. 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. The fast-acting formula should be applied to actively growing weeds. Visible results in just 3 hours. Active Ingredients: Imazapyr, isopropylamine salt and Pelargonic Acid and related fatty acids.