Crestwood keeps its share of big Cook County oaks, the kind the forest preserves hold onto just up the road, and they throw a shade any lawn has to be coaxed through. A.R Lawn Service LLC does that coaxing — mowing on schedule, trimming around trunks and fence posts, edging the walks, and clearing the leaf fall a south-suburban autumn drops all at once. Winter turns the same routes into plow routes: driveways and lots pushed clear, walkways shoveled, salt down on the shaded stretches that never quite dry. Gray January weeks in these towns reward whoever arrives on time and finishes the whole job. Crestwood, Midlothian, Oak Forest, Alsip and Palos Heights are the neighborhood.