The Roundup For Lawns Crabgrass Destroyer Ready To Use 1 Gallon is a powerful weed killer formulated to eliminate even the toughest grassy weeds, including crabgrass, foxtail, and goosegrass. This ready-to-use spray absorbs on contact and starts working immediately, entering weeds through leaves, roots, and shoots. It stops plant pigment production, causing treated weeds to turn white and stop growing, eventually turning brown and dying. Ideal for use on Northern lawns, it is safe for Kentucky Bluegrass, Fine Fescue, Perennial Ryegrass, and Tall Fescue when used as directed.