October takes the silver maples on the Thornton side streets all at once, and for two weeks the gutters run yellow. Anderson Lawn & Landscaping Services Inc. spends that stretch behind blowers and rakes, pulling leaves off the turf before they mat down and smother it through the freeze. The rest of the year is mowing, edging and the ordinary upkeep of beds and shrubs, but autumn is the season that decides how a lawn comes back in April. There is a particular satisfaction in a yard stripped clean in late fall — grass short, beds cut in, driveway swept, everything squared away before the first weather comes down off the lake. Neighbors notice that kind of finish even if they never say so.