Gordon's Ornamec 170 Grass Herbicide, 32 Ounces Ornamec 170 is designed for maintenance of landscape beds Reduces risk of ornamental plant injury Selectively controls emerged annual grasses - panicums, goosegrass, crabgrass, foxtails and sandbur Also controls stubborn perennial species like Bermuda grass, quack grass, torpedo grass and Johnson grass Grass growth stops within 48 hours and death occurs within 1 to 3 weeks