The old Delaware Canal towpath still runs through this stretch of lower Bucks, and on a January morning it is the quietest line in the county — until the plows start. Hanagan Landscaping, Inc. is out ahead of that quiet: driveways opened, walkways shoveled down to the concrete, salt spread before the first commuter reaches Route 13. Come spring the same trucks trade blade for mower, and Tullytown's yards get their weekly cut, edge and trim right through the growing months. A cleared drive at dawn and a crisp lawn in June are the same promise, made twice a year in different weather.