Roundup® Poison Ivy Plus Tough Brush KillerRoundup Poison Ivy Plus Tough Brush Killer kills over 200 types of weeds, including poison ivy, poison sumac, poison oak, wild blackberry and kudzu. Its fast acting formula begins absorbing on contact and provides visible results in 24 hours. It's easy to use, just spray the leaves to kill the root. This product kills weeds to the root so weeds don't come back. Roundup Poison Ivy Plus Tough Brush Killer is great for use on patios and walkways, around