You'll love this vintage jam made from plump, succulent boysenberries! Here's all the boldness of boysenberry flavor without the preservatives and artificial flavors. Boysenberries are a berry cross between the raspberry, blackberry, dewberry, and loganberry which was discovered on Rudolph Boysen's California farm in the late 1920's. It quickly became popular for it's juicy sweet/tart berry flavor. Enjoy a tasty piece of yesteryear with our wholesome, delicious boysenberry jam.