Ortho GroundClear Year Long Vegetation Killer Refill kills weeds and grasses while also preventing new growth for up to a year. Attach a Comfort Wand from the original Ortho GroundClear Year Long Vegetation Killer ready-to-use spray bottle to use this refill. Use on roads, sidewalks, gravel areas, rock and desert landscapes, under decks, in parking lots, around fences and curbs, and in unplanted areas where weeds are undesirable. The fast-acting solution should be used on weeds that are actively growing. Ortho GroundClear Year Long Vegetation Killer gives you visible results in one hour. Treats up to 400 square feet ft.