Crepe myrtles hold their color deep into the long southern twilight, and fireflies come up out of the cut grass about the time the mowers go quiet. Southern Yard Lawn Care Services LLC works Ringgold and the roads out toward Fort Oglethorpe on that end of the day — mowing, trimming, edging, shaping shrubs, sweeping the drives clean. A yard finished at dusk has a look all its own: everything level, soft, dark green. Summer down here is generous to grass and demanding of whoever tends it. They take that trade gladly.