Thanks for the replies and suggestions... Myself personally, I'm not a flower guy. I love trees and can handle shrubby. This is a situation where probably at one time thousands were spent on the hardscaping and plants on this property. The east and west boundaries are flanked by cherry trees and it sits on a beautiful 2.5 acres.
Someone over time decided it would be fun to get wild flower packets and start going "wild" with them everywhere in all the planters and that's where it is now.
So basically, there isn't going to be anything easy about mulching between all the packed in flowers... I think this is going to be a good job for my couple of college guys!