By late June the light this far north hangs on past nine, and the lawns on the slopes below Thompson Park keep their color right to the end of it. Red Line Property Solutions spends those long evenings mowing, trimming and edging across Watertown, chasing the one thing that makes a yard look finished — the line where grass meets sidewalk, cut clean enough to run a thumb along. Spring cleanups open the season, leaf removal closes it, and the mowing in between keeps its own steady week-to-week beat. Grass grows fast and briefly up here, so no week gets skipped. A straight stripe laid across a front lawn is a small thing to take pride in, and it is worth taking pride in anyway.