Kill the toughest weeds and grasses down to the root with Roundup Ready-To-Use Weed & Grass Killer III refill! This formula is ideal for use in and around vegetable gardens flower beds tree rings and mulched beds as well as on cracks in driveways walkways and patios. This convenient no-mix ready to use formula is rainproof in just 10 minutes and you get visible results in 3 hours. This 1.25-gal. refill has been designed for use with an empty Roundup Ready-To-Use Weed & Grass Killer III container. Application is easy as the visible foam lets you see where you have sprayed. Apply when weeds are actively growing. The formula will start working immediately to kill problem weeds and grass. It kills tough weeds to the root so weeds don t come back. The tough weather formula of Roundup Ready-To-Use Weed & Grass Killer III even works in cool and cloudy conditions.