Late afternoon on the Horn Pond side of Woburn, the light comes low through the pines and every mown stripe shows twice as clearly. S.B. Landscaping works that hour often — the last cut of the day, the trimmer around the mailbox post, the blower run down the sidewalk until nothing is left but grass and clean pavement. Weekly mowing is the spine of the season, with edging, bed maintenance and mulch in spring, then leaf cleanup once the oaks up around Rag Rock start letting go. The yards on this side of town are older than the subdivisions to the north, full of odd corners and stone steps that reward doing things by hand. A tidy lawn never announces itself; it just makes a house look loved.