Oak Hill at noon in July: traffic on Route 1, heat lifting off the asphalt, and behind every building a patch of grass waiting its turn. Its Green keeps those patches honest with mowing, trimming and a weekly round that takes a yard from overgrown to squared away in about an hour. Simple work done on a schedule is the whole difference between a lawn that looks tended and one that clearly is not. Homeowners and small businesses around Scarborough get the same routine either way, cut at the right height and finished at the edges. The run reaches from Scarborough into South Portland and the towns beside it.