On the ridges above Castle Rock the gambel oak grows in stubborn thickets, all elbows and knots, and the grass beneath it keeps a schedule of its own. Knothead Tree and Lawn Care works the late-afternoon hours, when the light comes sideways off Memmen Ridge and every mowing line stands up like corduroy. Mowing, edging, string-trimming along fence lines and rock borders, and the cleanups that pull oak leaf and needle drift back out of the beds — that is the shape of the week. There is a real satisfaction in the last pass, when the trimmer goes quiet and a yard sits square against the scrub-oak hill behind it. Homes across Castle Rock and out toward Sedalia and Franktown are all on the route.