The north end of Haverhill runs straight up against New Hampshire — a line you would never find on the ground if the road signs did not mention it, the same oaks and the same stone walls standing on both sides of it. Stateline Lawn Care works that seam of the map, mowing, trimming, edging and handling the seasonal cleanups on properties from the city's back roads out to the border neighborhoods. Yards up this way run long and open, half full sun and half woods edge, and the grass takes its cue from whatever the week's weather decided to do. The measure of the job is identical on either side of the line: an even cut, tight corners, nothing left behind but the smell of it. A simple standard, kept every visit.