Cultivated blueberries: This is the variety found most often in a supermarket. These berries are marble-sized, round and plump, and have a deep blue color and whitish, dusty-looking surface.
Wild blueberries: Wild blueberries are far more rare. You may find them sold fresh locally (they grow in cool climates such as Maine and eastern Canada), but more often they are available canned or frozen. They are much smaller than the cultivated variety. There are 1,600 wild blueberries to the pound, compared to 500 cultivated blueberries. Wild blueberries have a chewy, dense texture and deep flavor.