Along Boston Street the old factory brick holds the afternoon heat, and the first real green of the year shows against it like a signal flag. GH Tree Services and Landscaping opens the season there with cleanups, winter's litter raked out, beds edged back, lawns given a first cut that wakes them up. Through summer the routes run on rhythm: mow, trim, edge, sweep, move along. Autumn brings the leaves and the whole sequence plays in reverse. A neat lawn in front of a weathered brick block makes a contrast worth stopping for.