On the first genuinely warm Saturday of the year, South Common fills up and every lawn in Lowell suddenly looks a week behind. Grey's Pro House Washing gets them caught up: mowing, trimming along the fence line and the foundation, hedges cut back, and the spring cleanup that clears whatever the thaw uncovered. Through the summer it holds to schedule, because grass forgives nearly everything except being forgotten. When autumn arrives the leaves come off before they pack into a wet mat. Tidy ground, week after week, and the house standing on it looks the better for it.