Invasive tree roots in lawn
I'm looking for ideas to revamp my front yard keeping in mind that some of the lawn must go. I have several very large poplar (cottonwood) trees that provide much needed shade along the north side of the yard. These are older trees and the very large roots have come to the surface in the lawn. In several places I can no longer mow over the roots. I do not want to remove the trees/roots, but design a garden around the roots, preserving the trees. The lawn, or parts of it, can go. Does anyone have ideas about attractive ways to change my yard over from lawn to something else?