Thanks Lin! I had a feeling that was about the only way to get rid of these. They are planted too close to the house, and were massive before I cut them back. Even with yanking them out I will probably be dealing with volunteers for quite a while, but at least I know concentrated roundup will do them in. I brush it on after I cut them (no spraying). At least we got the tree that was too close on the other side down over the weekend. Baby steps!
Kim