Roundup® Ready-To-Use Poison Ivy Plus Tough Brush Killer combines with two brush-killing ingredients to penetrate the waxy leaves of hard-to-kill weeds and brush to kill them down to the root - guaranteed! It also kills ivies and weeds like poison ivy, poison oak, and poison sumac, as well as invasive vines and shrubs like kudzu and wild blackberry. Rainproof protection in as fast as 30 minutes. Use on wooded lots and other areas where brush invades your yard. Can be used to kill stumps and prevent regrowth.