The Sawmill River comes down out of North Leverett talking to itself over the ledges, and on a June morning the whole valley smells like cut grass and wet stone. Living Earth Landscapes mows, trims and edges the lawns strung along those back roads — the ones that end at a barn, a garden, a line of sugar maples. Grass runs hard here in the weeks after the last frost, so keeping ahead of it means being out while mist is still lying in the low field. The reward is plain: a lawn brought back to an even nap, the edges cut true against the stone walk, the clippings raked off before noon. In a town of woods and water, a tended lawn is a small clearing somebody chose to keep.