Saturday morning in the South End comes on slowly — brick, bay windows, a dog on a stoop, and the sun finding the small squares of grass between them. Lawndromat Professional Services, LLC looks after those Boston lawns: mowing, edging along iron fencing, trimming what the mower cannot reach, and cleanups at both ends of the year. A panel of turf this size hides nothing, so height, line and pickup are the entire job. Feeding and overseeding keep the color even where foot traffic wears it thin. Done well, a twelve-foot lawn can carry a whole block front.