Ok, I have this customer who has a large tree in his back yard. I wasn't able to ID the tree for sure. Might be a birch. But it's definitely larger than most birches I see around here (most here are Himalayan White Betula jacquemontii). It seemed to have white bark on the upper part of the trunk, after about the first 15' or so. And the leaves looked like birch leaves, but a little larger than the ones I typically see. Tree is a good 50-65' tall with a trunk diameter of at least 30". Anyway.....so this tree is planted along his back fence. In fact, the fence is build AROUND the trunk of the tree. And it is sending out little suckers ALL OVER his back lawn. I'm not talking about suckers up near the trunk either. Most of them are at least 10-15' away from the trunk and they go up to 60' away from the tree. Just little tiny 6" tall trees everywhere. They are about 5' appart from one another all over the entire yard. So he wants a back yard renovation. First thing we would have to do is kill off his existing lawn, blackberry bushes, ivy, and other brush. In the process of spraying out the lawn, we'd be hitting these little suckers too. So that's where my dilema is. If I use Crossbow on those suckers, are they going to travel back 15'-60' to the main tree and kill the entire 50' tall tree? Or will the crossbow just kill the suckers only? And if they WILL go back and kill that tree, then how do you get rid of those damm things without spraying them with crossbow? I'm pretty sure round-up isn't going to kill them. Also, we realize that the tree's roots will eventually send more out at a later date. But if we could at least kill off the ones that are there presently, that would be kind of a good fresh start to his back yard. Then we can install a new lawn and he can address the new little ones as they come up.