Up in the Highlands the lawns tilt toward the sunset, and the light off Ashley Reservoir turns the whole hillside gold around seven o'clock in June. Axiom Landscape & Home Improvement tends those yards through the growing months — mowing on a steady week, edging the walks, trimming close to the granite, carrying off clippings in summer and leaves in the fall. Come winter the same hills matter for a different reason: the drives run steep, so plowing, shoveling and salting them takes patience and a good angle. A cut lawn on a slope shows every line you make, which is reason enough to make them straight. Two seasons, one list of addresses, all of it in Holyoke.