So I just finished the major part of this install. I feel I need some height in the backyard and I want to use an ornamental tree of some sort. I originally was thinking of a mimosa, but realized it would get just a bit too big and potentially weedy. I also have been thinking of a "White" red bud tree as they are a bit smaller than regular red buds, but do they become weedy like red buds. I'm drawing a blank. The flagstone path is going to be lined with small "blueish" perennials to help define the path, and there will also be a couple of prickly pear cactus and two Ruby Ribbons switch grasses. Any thoughts.