Comment on the redbuds and junipers:
The junipers should be dead if you cut them off at the ground. Probably want to remove the stumps by digging - they are usually shallow rooted (but sometimes tenaciously!).
As for the redbuds, I had some two year seedlings of C. reniformis (Oklahoma redbud) that were in the perennial garden and I decided that I didn't need more than the original plant in my yard, so I cut them off at the ground. I did so for a season and a half but they continued to return. Finally, after that long attempt, in the FALL nearing dormancy but still with green foliage I once again cut off the 6" suckers and this time,using a small artists' paint brush, lightly dapped them with a mixture of 50% 3-way broadleaf weed killer and 50% glysophate. Minimal chemical application with terminus of problem. Timing, I believe, was key.
hortster