The exact origins of the boysenberry are unclear but the most definite records trace the plant as it's known today back to grower Rudolph Boysen, who may have gotten the dewberry/loganberry parent from the farm of a man by the name of John Lubben (who called it a "lubbenberry"), who in turn may have gotten it from Luther Burbank.
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In the late 1920s, George M. Darrow of the USDA began tracking down reports of a large, reddish-purple berry that had been grown on Boysen's Northern California farm.
Spencer Tracy and Katharine Hepburn are out for a drive and Tracy pulls into Mels and orders Oregon Boysenberry ice cream, then has a minor traffic altercation with a black man.