Napa cabbage is a great fall vegetable in Maryland. My cousins have a community garden plot where they grew a beautiful crop they will store and use in soups, stir fries, and slaws. These babies started out as purchased plants set out in August and grew into 5 lb. monsters!
They wrap each head in newspaper and store them in their garage. They last through the winter although some of the outer leaves deteriorate and have to be trimmed. This convinces to give Napa cabbage a spot in my fall garden next year.