By September the prairie plantings around County Farm Park have gone gold and gone to seed, and the mowed lawns nearby look all the crisper for standing next to them. D&L Lawn Services keeps those yards on a weekly line — cut, trim, edge, clear — right down to the last mow of the year, when the grass slows at last and the leaves take over the job of covering ground. Autumn cleanup is a genuine undertaking in this part of Ann Arbor: it is old and well treed, and the drop is generous. Spring runs the other direction, waking a lawn out of the gray matted mess that March always leaves. The pleasure of it is the before-and-after, one visit at a time, every week of the season.