Kill weeds and grasses down to the root and prevent new growth with RoundUp Extended Control Weed & Grass Killer Plus Weed Preventer. This dual-action concentrate formula gives you visible results in three hours, and is rainproof in ten minutes. Suitable for use on driveways, sidewalks, and patios; along fences, foundations, curbs, and retaining walls; and along the edge of lawns. | RoundUp Concentrate Extended Control Weed & Grass Killer Plus Weed Preventer | Size 32 oz