Late May in Piety Corner: the lilacs going over, Chester Brook running clear, and every lawn on the street growing faster than anyone can keep up with. Rafael Landscaping takes that off people's hands — mowing on a set rotation, edging tight to the walk and the driveway apron, trimming along fences and foundations, a new layer of mulch banked around the plantings. The spring cleanup clears whatever the snow pressed flat; the fall one takes the leaves and puts the yard to bed. Waltham's older neighborhoods are full of odd angles and narrow side yards, and those are the parts worth doing slowly. Done right, nobody notices the work at all — only the lawn.