September on Lansing's east side is the lawn's second spring: cool nights, heavy dew, and grass that finally stops fighting the heat. Pure Green Lawn & Tree Professionals works that window hard — mowing at a tighter cut again, trimming the borders clean, clearing the first oak leaves off the turf before they mat down. Lawns growing under big old trees have to be coaxed rather than forced, and there are plenty of those out toward Haslett. The measure of a season's care is not July; it is how green a yard still looks in late October. That is the standard they mow to.