Head a little inland from the sand and Old Orchard Beach becomes shade streets and campground pines, where July heat sits still and the grass wants a steady hand. de Melo Enterprises, LLC keeps that rhythm — weekly mowing at a height that lets roots hold, trimming around pine trunks, an edge cut along every drive and walk. Mulch goes into the beds to keep what little moisture this sandy ground will hold, and cleanups clear needles by the barrowful in spring and again in autumn. It is unhurried work done on time, which is most of the trick. The reward is a yard still green at the end of the hottest stretch of summer.