Saturday morning in Wollaston opens with walkers on the Quincy Shore seawall and mowers a street or two behind them. Dan's Lawn Care runs that hour well — mowing, edging, trimming, blowing the walks clean — while the tide is out and the air still has the night's cool in it. Yards near the beach grow fast and unevenly, so the schedule matters more than the machine; return often enough and the lawn never gets away from you. By noon the neighborhood off Beechwood Knoll smells of cut grass, which is one of the honest smells of a Quincy summer. A straight line to the edge of the walk is a small piece of pride, and it holds all week.