Haven't used it in 10+ years, but Ortho Groundclear. Just don't hit any areas you want anything to grow for a year. Like all them though I cant say if todays formula is same... Lately I'm using Spectracide. Works great, but can grow back in a couple months. I know on the roundup they have different ones. The cheaper one is crap. The better one shows that it kills poison ivy, and it does work.