The Sugar River slides past the town of Decatur without hurry, and the old rail line beside it is a trail now, leafed over from May to October. Lawn Perfection works the yards of this Green County countryside around Brodhead — river-bottom lawns that grow thick in the damp, upland yards that bake in July and need a careful hand. The name says what the crew aims at: mow lines straight, trim tight, nothing left ragged at the fence. When evening sun comes down the Sugar River valley, a finished lawn glows a little, and that is the point.