Summer on Nantucket is coming to an end. Usually at this time of year I try to hold on to summer. Phenologically, September is still part of the growing season, and it’s peak time for many of our wildflowers. That’s what I usually say. This year, however, is a bit different. We’re starting to see fall colors in August (!), plants going dormant earlier than usual, and some things withering before our eyes—more typical late fall activity.