Sixth Avenue wears its murals in full color, and the yards on the side streets off it keep their own kind of upkeep — a mesquite pruned up off the fence, a strip of grass cut short and even. M.E.M. Landscaping does exactly that work: mowing, edging, weeding, and clearing whatever the wind has piled against a wall. Mid-morning is when the neighborhood is out, and a mower going by is part of the sound of the place. Mesquite drops fine leaf and bean pod all season long, so the raking is never truly finished, which is precisely why doing it well matters. The work covers South Tucson and the adjoining parts of Tucson.