Rubus × 'Black Magic' (patented as APF-77) is a notable thorny, primocane-fruiting blackberry cultivar developed by the University of Arkansas fruit breeding program. It was selected from a 2001 cross between the primocane-fruiting cultivar 'Prime-Jim' (APF-12) and the floricane-fruiting, erect thornless cultivar 'Arapaho'. This specific parentage was engineered to advance the genetics of annual-fruiting brambles; 'Prime-Jim' contributed the innovative primocane trait—originally derived from the wild diploid Rubus argutus —which allows the plant to flower and fruit on current-season canes. Meanwhile, 'Arapaho' introduced elite fruit characteristics, superior firmness, and early-season ripening genes. The resulting hybrid successfully combined these traits to offer dual-cropping potential, yielding an early summer crop on second-year wood (floricanes) and a subsequent late-summer to autumn crop on new growth.

The fruit of 'Black Magic' is highly regarded for its large size, glossy black appearance, and exceptionally sweet flavor profile, which marks a significant sensory improvement over early primocane-fruiting selections. A key physiological advantage inherited through its rigorous selection process is its exceptional heat tolerance; the flowers and young fruit on its primocanes can successfully set and mature even when summer temperatures exceed 30–35°C, a climate threshold that typically causes poor pollination and fruit mis-shaping in older primocane cultivars. Because it retains the thorny phenotype from its 'Prime-Jim' lineage and displays an upright, vigorous growth habit, it is primarily utilized as a premium variety for home gardens, pick-your-own operations, and local fresh-food markets.