Early on a Belfast summer morning the harbor is flat, the rail trail is empty, and the grass alongside it is still holding dew. Four Seasons Property Management is already cutting — mowing on a set rotation, trimming around posts and stone, edging walks and drives, keeping beds clear of whatever blows in off the bay. Lawns near salt water grow uneven and want frequent attention, and steady attention is exactly what makes them look effortless. The rounds start with a spring cleanup and finish with the last leaves carted off in November. Belfast, Northport, Waldo and Morrill, on the same weekly circuit.