Bayer Advanced™ 704330A DuraZone® Weed & Grass Killer, Concentrate, 24 OzThe days of multiple applications to kill weeds and grasses are over. Just one application of DuraZone Concentrate Weed & Grass Killer kills existing weeds & grasses Plus prevents new weeds & grasses up to 6 months. Apply it to the entire zone you want protected against weeds, not just the emerged weeds creating a weed prevention barrier that continues working for up to 6 months so you dont have to. Controlling weeds in your landscape has never been