The Paw Paw (Asimina triloba) at 3-6 inches long and 1-3 inches wide is North America's largest edible fruit. It grows wild on a tree that can reach 12-20 feet tall. But forget the stats; the real point is that the fruit is delicious, at peak flavor tasting much like a perfect blend of mango and banana and becoming more banana-like as it ripens. Paw Paws are rated more nutritious than any other fruit and efforts are under way to make it a commercial crop. (Fun Note: Whenever you see a zebra swallowtail butterfly, you know Paw Paw trees are about; Their leaves are the zebra caterpillar's only food.)