South Burlington keeps its green in generous pieces — the open fields at Dorset Park, the wooded seam Potash Brook cuts across the city — and the neighborhoods between them run to real lawns. Grass Cuts For Less Inc mows and trims those yards, edges the walks and drives, mulches the beds, and clears the leaves when the street trees drop them in a single week. This is a city of corner lots and subdivisions where every property faces the road, so tidy borders do a great deal of the work. Grass jumps here in late May and doesn't ease off until September. A whole block cut on the same afternoon looks, from the sidewalk, like the street agreed on something.