Out at Ten Hills the land finally opens a little, the Mystic bending past and the wind coming up the water on August evenings. Superior Lawn Care & Construction mows and trims the lawns along that edge of Somerville, cutting them even, edging the drives and walks, keeping hedges in line and beds mulched against the heat. Grass near the river grows hard and fast, and holding a clean, level cut through the middle of summer takes showing up on schedule. Spring means opening the yard back up after the winter; fall means moving the leaves out before they smother the turf. The result is worth the trip: a broad green lawn, edges sharp, river light across it.