The days continue clear and bright. Two weeks ago, much of the landscape was still deep, late-summer green. Now, a few maples and dogwoods are orange, or red. Cottonwoods and catalpas and sweet gums and shagbark hickories are yellow. Grape vines and nettles are bleached with age. Locust leaves drizzle steadily to the undergrowth. The serviceberries are almost bare. The black walnut trees keep only their last fruit. Purple poison ivy and Virginia creeper outline the changes. In yards and gardens,