There is a blue half-hour on Webster Street in December, after the plows have gone through and before the porch lights come on, when a cleared driveway looks like something built rather than something cleaned. MF Landscape & Design, LLC works toward that picture all winter: drives plowed wide, walks and steps shoveled out, salt and sand spread where shade keeps the freeze in place. The warm months belong to the grass — mowing, edging, trimming, and the cleanups that bracket the growing season at either end. The design instinct shows up mostly in the lines: straight where they ought to be, curved where the yard asks for it.