By two o'clock on a July afternoon the thunderheads have piled up white and enormous over the mountains and are drifting east toward Centennial, and every mower in the county is racing them. Epic Lawn Pro knows that hour well — mowing, edging along the drives, trimming the tight corners, then blowing the walks clean as the first cool gust arrives. Feeding and aerating carry the bluegrass through the dry stretches, and the fall leaf work closes the year out. Grass here grows in bursts, hard after a storm and hardly at all in a rainless week, so the schedule bends to the weather rather than the other way around. A lawn cut just ahead of the rain comes back the next morning almost glowing.