Roundup® Poison Ivy Plus Tough Brush Killer Concentrate 32ozRoundup Concentrate Poison Ivy Plus Tough Brush Killer Roundup Concentrate Poison Ivy Tough Brush Killer combines the power of two tough brush killing ingredients to kill even the toughest weeds and grasses Kills weeds to the root. Guaranteed* Rainproof in 30 minutes Visible results in 24 hours 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. Created with