September evenings in Mount Vernon come in gold and long, light stretching across open ground until the grass looks lit from underneath. Coley's Ground's Keeper's is finishing up in it — mower loaded, trimmer still warm, one last pass along a sidewalk edge that had gotten shaggy. Mowing, edging and cleanup, held to the standard where turf takes a stripe and keeps it. There is a particular pleasure in walking a property at the end and finding nothing to go back for. Grass around here keeps growing well into October, and they keep showing up for it.