Cambridge weather comes off the Charles first — damp river light in April, flat white glare on the brick sidewalks in August, then the short afternoons when a storm arrives sideways down Mass Ave. HS Landscaping and Masonry works to that clock: mowing, aeration and fertilizing through the green months, planting and pruning as the dooryard gardens fill in, drainage and sprinkler lines set so water goes where it ought to, tree pruning and removals when a limb has outgrown its place. Winter turns the whole job over — plowing and clearing until a driveway is a driveway again and the walk to the corner is passable in boots. What's left behind is plain and deeply satisfying: even passes across a lawn, a bed edged crisp against the granite curb, a yard that keeps its shape from one season into the next. The work carries across Greater Boston — Cambridge, Lexington, Woburn, Burlington and the towns folded in between.