From our local natural food's store flyer. But what is a marionberry? As American as Walt Whitman, the American Revolution and berry pie, the Marion blackberry, or “Marionberry” as it is known by consumers and marketers, is a distinctly American berry with worldwide appeal. A cross between the Chehalem and Olallieberry blackberries, the Marionberry captures the best attributes of both berries and yields an aromatic bouquet and an intense blackberry flavor for which it has become known. This premium quality flavor, described by tasters as “earthy cabernet”and “sweet with notes of tartness”, makes the Marionberry a superb choice for canning, freezing, pies, jams, jellies and ice creams and has earned the Marionberry an outstanding reputation worldwide . (Source: ) Substitute blackberries or raspeberries if marionberries are not available.