I pulled up a million suckers today. You're right,
@Tiffany, they are easy to pull, almost like sprouts, bunches of them per inch! Plus after our soaking rains, it was a cinch to get rid of. While weeding the rock bed, I noticed a young CM in the neighbor's yard. She probably won't even notice it. Might be nice to have one where it is, though it is close to the wrought iron fence. The mother tree could be across the driveway about 15 feet away or across the driveway and 30ft away. Do you think those roots traveled under the driveway and 10 feet north or 20 ft south to produce suckers? Or are those that I saw real off spring from seeds?
Yes, there are dwarf varieties. I have one. A purple on, I think? IDK? It has not bloomed and is a sloooooow grower. Though the standard size ones I planted at the same time have doubled in size and bloomed already.