The Merrimack slides through Concord behind the trees, brown with melt in spring and steady the rest of the year, and the city grows right up to its banks. Concord LAWN and LANDSCAPE works both sides of the calendar along it: mowing, trimming, mulching, hedge work and cleanups while things are growing, then plowing, shoveling and sanding when they are not. Summer visits end with even stripes and a tidy line where the lawn stops and the drive begins. Winter visits end with pavement showing and the walk gritted before the coffee is on. Storms here can run all night, and the point is that the morning does not feel like one happened.