South of Littleton the ground stops pretending to be flat — red rock tilts up out of the grass and the prairie leans away toward Deer Creek. Colorado Land Concepts works with that kind of ground rather than against it, tending lawns on lots where the soil is thin, the slope is real and the sun comes in hard from every angle. Running a mower, trimming the borders and cutting a clean line sound simple until the yard has three grades and an outcrop in the middle of it. Out here a well-kept lawn reads as a small act of insistence, a green rectangle held against the high plains. They keep those rectangles crisp all season, then hand the ground back to winter.