As I sit in the back garden basking in the glory of a Kwanzan cherry tree, its prolific pink petals parachute gracefully to the ground. The wind whispers through the canopy and the mind begins to wonder. Will my pepper seedlings ever start to grow? Is it too late to sow more peas? What will Nantucket’s summer look like in this “new normal’’? Although these questions can paralyze any action, I think it’s important to do just that. Act…