I have a fairly large tree in my lawn. I want to trench an edge around it and mulch it. Trouble is, the roots are everywhere at the surface. Most are within inches of each other. I'm already about 8 feet from the trunk which is close to the leaf edge. I have a 1 acre yard. I'm afraid if I go out any further, it will look funny. Any suggestions? I have most of the yard already edged so I was hoping to do this tree as well.