They are cultivated, but also grow in the wild. Blackberries have 84 calories per cup, and are full of potassium, Vitamin A and C and also have 46 mg of calcium per cup. To freeze, spread the berries in a single layer on the cookie sheet and freeze solid. Transfer frozen berries to plastic bags. They can also be canned following canner directions.
Blueberries are a relative of the cranberry and are native to the United States.
Blueberries were probably the first snack food consumed in North America. Native Americans used to sun dry and smoke them to store them for the winter months. It is also related to the European bilberry and whortleberry. When looking for blueberries, they should be firm and dry. The skin should be smooth and deep purple-blue.