briefly: I'm looking to get rid of a LOT of poplar stumps that are close to other poplar trees that I don't want to kill. From online searches, including this forum it seems the best way to kill the stumps is to drill holes and use some sort of herbicide on them. But what I am concerned about is that I may weaken nearby trees (via transfer of herbicide through roots) , which would be a big problem as these trees are uphill from our home and are HUGE! Should I be concerned? How close to other trees is it safe to use herbicides or other stump killers? Any advice on how to proceed? And now in detail: A few years ago my wife and I bought a house in eastern PA. The house sits on 12 acres of heavily wooded, rocky, hilly land. On the edge of our yard, the ground slopes up and we are surrounded by very tall poplar trees. Unfortunately, the previous owner did nothing to control the wild plant growth near the house and the yard is also surrounded by tons of small poplar saplings and poison ivy etc.. Did I mention poison ivy? So the first year I moved in, I had the bright idea of cutting a lot of those little poplar trees down, thinking that the little stumps would die. Yeah, that was a really bad idea. Now I have a hundred poplar bushes. So anyways, this year we are going hardcore on getting rid of all the poison Ivy and all those ugly little trees bordering the yard. I'm pulling up as much poison Ivy as I can (properly suited up, I can assure you) and then am going to cover the ground with some weed barrier and then cover with mulch. I've had success covering up poison ivy using this method in another part of the yard, so not concerned about this. I'm assuming that covering the small little poplar stumps with the black weed barrier cloth and covering with mulch will be enough to get rid of them. (?) But what about the larger stumps that will poke through the weed barrier and mulch? Can I safely treat these with either salt or some sort of herbicide without killing the trees next to them? There are literally a hundred of these things. Please tell me I don't have to chop them all out by hand!