I have a flowering cherry that is about 15 years old. It has grown to be about 30 or 35 feet wide and about twenty feet tall. The roots being shallow have caused my walkway to the front door to heave a little and it has cracked in several places. The tag on the tree said maximum height and width 15 feet! We love the tree though. Can anyone suggest a good replacement for the cement slab walkway? Currently the slabs are approximately 5 feet long and three and a half feet wide. The cherry is about 8 feet from the walkway. I don't see roots right at the walkway, but can see a root in the lawn on the other side a few feet past the walk.