Boysenberries are dark red to black in color, shaped like a blackberry, and berries can grow up to 1 inch long. They are a combination of raspberries, loganberries and blackberries and offer a sweeter berry profile than the other varieties. Because they are very juicy and fragile, boysenberries are often used in jams, jellies, syrups and sauces; they can be used the same way as blackberries. Boysenberries are usually available in the late spring and early summer in the U.S. and from Australia and Chile other times of year.