Clayton sits on the flat sand of Gloucester County, where the soil drains fast and a June lawn can go from lush to thirsty in the space of one dry week. All American Lawn and Hardscapes L.L.C. reads that ground for a living — mowing at the right height for the heat, edging the walks, trimming the fence lines, and running cleanups in spring and fall. Down here the horizon is farm field and treeline, and a mown yard against it looks like a made thing. Cut high in July, cut close in October: the calendar does half the thinking. The rest is showing up and finishing the edges.