Description and specifications of a new and distinct blackberry cultivar named ‘Osage’ which originated from seed produced by a hand pollinated cross of Ark. Selection ‘A-1719T’ (non-patented, unreleased genotype)בA-2108T’ (non-patented, unreleased genotype) is provided. This new blackberry cultivar can be distinguished by its excellent flavor, thornless canes, even drupelet fill and lack of white drupelets on berries, medium berry size, excellent postharvest storage potential, mid-early season ripening, high yields and healthy plants.
