September at the Hommocks marsh turns the spartina gold while the lawns above it are still going strong — Mamaroneck holds its green late, with the Sound keeping the frost honest. Green Care Landscaping LLC rides that long tail of the season, mowing and trimming into October and then clearing leaves down to bare turf. Coastal Westchester properties often carry tide-damp soil at the bottom of the slope and dry shade at the top, sometimes in the same yard. Reading that difference is what separates a cut lawn from a cared-for one. By the end of a visit the borders are sharp, the beds are clean, and the place looks like somebody was paying attention.