Noon in midsummer along Silver Lake Road, and the heat sits down on the lawns like a hand. Steel Edge, LLC works right through it for one particular result: the clean line where turf meets concrete, cut so that a sidewalk reads as a sidewalk again. Everything else arranges itself around that line — mowing on rotation, trimming at fences and posts, cleanups when the season opens and when it closes. Edges are a discipline; you hold them or you lose them by August. Linden yards, and the lots along the roads running toward Fenton and Gaines.