West of the village the stone walls run off into Willowdale State Forest, and the lawns that meet those old lines look best when they are cut with some regard for what surrounds them. Mosaic Ecological Land Care tends Topsfield lawns across the season — mowing, trimming, edging, and the cleanups that bookend the year. Early-summer light comes flat across a meadow-edged yard and shows every mistake, which is a fine reason to make none. Fall means leaves, a great many of them, gathered before the first hard rain glues them to the turf. The result is simple: an even green lawn sitting easily in a green, uneven landscape.