Grass on a sandbar is a small act of will. Long Beach is a mile of ocean-side blocks laid over dune sand, and every green square here has been coaxed into existence and then kept there. GreenWave Turf does the keeping — mowing at a steady interval right through the growing season, edging clean along walks and driveways, trimming the corners a mower cannot reach, clearing the yard out after wind and weather. In midsummer, when the heat sits on the island and the sprinklers throw little rainbows at seven in the morning, the difference between a maintained lawn and an unattended one is obvious from the corner. The maintained ones are the whole point.