I'm creating a brick mowing strip around the perimeter of my lawn. Therefore, I'm digging deep enough to put the bricks in. Unfortunately, there's a couple areas where I've hit next door's tree roots so I can't put bricks in deep enough without hacking into the roots. It's really frustrating, especially it's made me realised why the grass around that area always seemed to struggle! If I cut into these roots, will it seriously harm the tree? Is it possible to lower the roots, they're pretty thick? I can't see any other way without ruining my project. I've read the sticky about tree roots and now I'm left feeling a bit disheartened. Thanks.