Billerica lies where the Concord and Shawsheen rivers wander north toward Lowell — old canal ground, pine woods at the edge of things, and lawns that run right up to the treeline. Brian J Dinsmore Landscaping keeps those yards in trim through the growing months, mowing and edging until the grass holds a clean line against the beds and the green carries all the way to the sidewalk. Come January the same ground goes white, and the work turns to plowing: driveways opened while the streetlights are still on, walkways scraped down to bare pavement before the first car door swings. There is a plain satisfaction in both jobs — a lawn cut straight, a drive cleared wide — and it stays with a house long after the truck has pulled away. Lawn care and snow removal for Billerica and the towns around it.