Roundup® concentrate 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 hr. Use of a Roundup® brand sprayer is recommended with the concentrate. Add 6 fl-oz/gal of water and spray the leaves to kill the root. This product kills weeds to the root so weeds don't come back, assured (If for any reason you are not satisfied after using this product, simply send us the original proof of purchase and we will refund the purchase price). Roundup® concentrate Poison Ivy Plus Tough brush killer is great for use on patios and walkways, around homes and buildings, along paths and fences or other areas where tough weeds are growing. Rain or watering 30 min after application will not wash away effectiveness. Roundup® concentrate Poison Ivy Plus Tough brush killer is the easy way to control allergy causing plants around your yard.