Use Ortho groundclear poison Ivy and tough brush killer1 to kill poison ivy, poison oak and wild blackberry. Also kills honeysuckle, kudzu, ragweeds, dandelion and other weeds as listed. It kills weeds to the roots. Apply this concentrated formula with an Ortho dial 'N spray or a tank sprayer around homes, cabins, buildings, fences and along trails and rails. Wilting or yellowing will occur in 2 to 6 weeks. Ortho groundclear poison Ivy and tough brush killer1 contains a proven weed killer that targets brush and vine weeks.