Maury Island Farm Marionberry Jam is a true Pacific Northwest treat.Larger, sweeter and juicier than the blackberry, the Marionberry was developed by cooperative extension service researchers over 50 years ago. Marionberries started as domesticated blackberry varieties with superior taste characteristics, favored for jam and preserves.Due to the complex flavor, Marionberries are known as the "Cabernet of berries". Marionberry Jam is one of the most popular flavors offered by Maury Island Farm. ...