Early morning in the Ken Caryl valley, cool air settles on the valley floor and the grass holds its dew an hour longer than it does out on the flats. Greenleaf Lawns works that first cool stretch of the day, running the mower, trimming and edging while the sun is still climbing the ridge and the sprinklers have only just shut off. Cutting dew-damp grass and cutting baked afternoon grass are two different crafts, and the early start is a deliberate choice. By the time the valley warms, another few yards are squared away and the engines are quiet. The lawns keep that combed, unhurried look right through the week.