My project involves installing a flower bed surrounding a line of trees that boarder a sidewalk. (approx 1'200sf of flower bed). I'm having trouble removing the grass roots without damaging the tree roots. My worry is creating a moisture barrier if I leave the grass roots, also the grass growing back up through the two inches of compost/top soil that I plan on bringing in. Any suggestions on how to remove the grass roots? Do I have valid concerns?
I have killed the grass, but digging or hoeing is really tough to do without damaging the tree roots. can I leave them there?