Route 46 climbs and drops across Roxbury, and every few hundred feet of elevation changes what the sky decides to do — rain in the valley, snow on the shoulder above it. Mountain Landscape Contractors plans around exactly that: snow plowing, driveway and walkway clearing and de-icing in the cold months, mowing, trimming, edging and cleanups once the ground thaws. Up on the ridges a storm can hang on for days after the lowland has moved along, which makes a cleared drive matter more. There is a good feeling in a plowed lot at first light with the ridgeline going pink behind it. Summer trades that for the smell of cut grass on a hillside and a lawn squared up to the treeline.