Come May the path along the Mystic fills with runners, and the small dooryards behind Medford's three-deckers turn green almost overnight. Crowleys Clippers Lawn cuts those yards, the wide ones up toward the lakes and the pocket-sized ones off the square alike — mowing, trimming, edging along walks and chain link, mulching beds, weeding, seeding and feeding. Fall cleanups sweep the maples out before the ground locks up for the year. A city lawn kept sharp changes the feel of an entire block, which is more than most small things can claim. Medford is the base, with the neighboring cities a few minutes either way.