I have a fifty year old chinese elm that drops seeds EVERYWHERE. Every damp spot sprouts elm seedlings. If I can catch them when they are a couple of inches tall, I can pull them or spray them, but if they are deep in one of my many climbing roses, I don't know they are there until they sprout out the top at about six feet. I cut them off, but they just come right back from the root. I spray them with Roundup (they just sneer.)
I have a similar problem with the neighbor's African sumac, and the many fan palms in the neighborhood. How do I control these woody "weeds" I can't get to them to dig them out, and often they are so close to the base of my roses that I couldn't dig them out without damaging the roots of the rose. They are driving me mad! Is there anything I can paint on them that will kill them without damaging the roses? I use a pre-emergent, which helps a lot, but I still get them in my vegetable garden, where I can't use a pre-emergent, and deep under my climbers.
I love the tree....it shades my whole backyard and west side of my house. I figure it just about cuts my cooling bill in half. It is 40' tall and 60' wide, and is a truly beautiful tree. I just wish it wasn't so prolific with its seeds!