Look north from Somerville and the first Watchung ridge stands out of the flat like a long green wall. L&L Custom Landscape Design LLC works the ground below it, shaping lawns and borders so a property reads well from the curb and from the front door alike. Mowing, edging, the seasonal cleanups that reset a yard twice a year. Then the cold comes over that same ridge and the job turns to plowing driveways and salting the paths people actually use. Shaping in summer, access in winter — both are ways of making a place easy to live in.