The last pass of the mower comes back along the stone wall, and the whole yard settles into its stripes — that clean, quiet moment is what the work is for. Lawn care in Derry means reading old Nutfield ground: the slow rise of a side yard, the granite that shoulders up near the road, grass that greens early in the low damp near Beaver Brook and holds its color late on the sunny slopes. Mowing, trimming, edging — plain words for a plain satisfaction, the crisp line where turf meets walkway, the smell of cut grass drifting down a street off Broadway on a Saturday morning. Perfection Landscaping LLC tends lawns across Derry and the neighboring towns of southern New Hampshire, week after week, so a place looks looked-after from the mailbox to the back fence.