Can I cut a 10 yar old weiglia to the ground and have it regrow or pull it out and start new?
It would be best to do this after frost in fall or in early spring before it leafs out. Doing it now, at the peak of the growing season will likely kill it. I’m not sure why you want to do this though. You could get it to fill in by cutting it back about 1/3 after it finishes flowering.