Resolva Pro Xtra Tough Weed Killer 3ltr is a ready-to-use weed killer ideal for controlling annual and deep-rooted perennial weeds. It delivers highly-effective, quick results even on the toughest weeds, and makes sure they don't come back. Resolva Pro Xtra Tough Weed Killer helps to control a wide variety of weeds including grasses, docks, thistles, nettles, dandelions, bindweed and much more.