The land around Clarkston was left in heaps by the glaciers — oak-topped rises, sudden hollows, a lawn that changes grade three times between the road and the front door. Emerald Turf Lawn & Landscape LLC mows that kind of ground, holding lines true across the roll, trimming close around the oaks and edging the drive back to a hard border. Summer mornings here start cool in the low spots and burn off by nine, and the grass grows accordingly. Feeding the turf, clearing the yard at both ends of the season and keeping to a regular cut are what stop a hillside lawn from looking half-wild. Stand at the mailbox afterward and every stripe follows the hill instead of arguing with it.