By late September the light in Porter Corners goes low and gold by four o'clock, and the maples begin letting go all at once. Greenfield Lawn & Landscaping spends those weeks mowing what is still growing and gathering what has already fallen — leaf cleanups, trimming, the last few cuts before the ground turns hard. There is a particular pleasure in a yard raked bare on an October evening, grass short and even, everything put away for the year. The town spreads out over hills and dirt roads, so every property is its own small problem to solve. Solving them is most of the job.