Early on a summer morning the geese come off Prince Pond in a low line, and the lawns beneath them are still silver with dew. Huerta Lawn Service starts about then, when the air is cool and the grass cuts clean. The round is mowing, string trimming along fences and beds, a crisp edge at the drive, and the walks blown clear before the truck pulls away. Downers Grove yards are older than the subdivisions further west — uneven, shaded, full of roots — and they respond to somebody who pays attention to them. By late fall the same stops are leaf cleanups, and the season closes the way it opened, early and unhurried.