Sunset over the prairie southwest of Houston takes its time — the sky goes orange the whole width of the horizon because nothing stands in the way of it. Southwest Irrigation Systems finishes yards around Rosharon before that light is gone: mowing, edging along walks and drives, trimming the close ground, blowing the concrete clear. The long warm season here means a lawn is never truly between cuttings; it is only ever ahead or behind. Staying ahead is a matter of routine and a full day of it. Pulling out of a drive with the yard squared away is a decent way to end one.