Saturday morning on the South Shore starts with the Railway rattling past Annadale and the first mowers waking up behind it. The streets running down toward Blue Heron Park are shaded and damp, the kind of ground that grows thick and needs a steady hand at the wheel. Lawn-Cutters keeps to that weekly appointment — mow, edge, trim, blow the clippings off the walk — and comes back with plow and shovel when winter has its turn at the same driveways. A yard finished before the day really begins gives the whole block a lift. Grass in summer, pavement in snow: both jobs end with a clean line.