At Lower Mills the Neponset slides past brick and granite on its way to the harbor, and Milton begins right there, uphill from the water. Boston roots lawn care works those streets — mowing on a weekly turn, trimming close to fences and foundations, edging where turf meets brick walk. Spring cleanups clear away the sand and salt winter left behind; mulch follows, and the beds get their outline back. In autumn the big street maples make a project of every yard, and it all gets moved off before the rain glues it down. City-edge lots, cut clean.