There is a specific light in Portsmouth in July — sun coming off the Piscataqua and lying flat across lawns a few blocks from the tide. Green Coast Landscaping mows in it, keeping grass even along brick sidewalks and behind the old houses where no two yards are the same shape. Sea wind and salt are hard on turf, so the cutting height, the trimming and the fall cleanup get adjusted to whichever block they are standing on. Small city lawns reward precision: an edge cut true along a granite curb changes the whole front of a house. By the time the gulls drift inland ahead of the evening breeze, the work looks like it was always that way.