I am interested in planting a small ornamental tree near a pool. The yard is small, and obviously I don't want large leaves going in the pool. I like flowering crabs, but I don't want any crab apples. The root base has to remain relatively small. Can you recommend a tree? Also, a landscaper that I spoke to recommended various wild grasses as border near a fence. She wanted to plant 5 plants in a relatively small area. Will that spread very rapidly?

Thank you, Mary Jane