Morning comes late to the Harlem Valley, where the Taconic ridge holds the sun back over Dover Plains until the fields below have had their fill of frost. Al Watson Tree Services works that narrow valley floor between the ridge and the Ten Mile River, where old maples lean over stone walls that stood here before the rail line did. Tree removal and tree trimming in this country mean reading a slope first: how the ground falls toward the water, and where a limb will land once it is cut. Pruning is the slower half of it, shaping a yard's shade for the summers still coming. And after a storm has come down the valley and stacked branches across a driveway, storm damage cleanup turns a blocked morning back into an ordinary one.