Along the Riverfront Trail the cottonwoods make the loudest sound in the valley, rattling all summer beside the Colorado. M&J Mowing LLC keeps the Grand Junction lawns nearby in the same easy order — mowed on schedule, trimmed around every fence post, edged where turf meets concrete. Fertilizer and aeration are what make the difference in ground this dry, and autumn means hauling the leaves off before they mat down over the grass. A fresh cut on a Saturday morning, the smell of it hanging in air that never holds humidity — that is the whole point of the week.