Use Ortho GroundClear Poison Ivy & Tough Brush Killer to kill over 60 types of weeds and brush, including poison ivy, poison oak, and wild blackberry. Also kills honeysuckle, kudzu, ragweeds, dandelion, and other weeds as listed. See results in only 24 hours. The formula is rainproof in 2 hours and kills to the root. Trust Ortho Groundclear Poison Ivy & Tough Brush Killer to take out tough weeds. Active ingredient: Triclopyr, triethylamine salt 0.70%.