Origin: in Carbondale, Ill., by U.S. Dept. of Agriculture and Southern Illinois Univ. Introd. in 1974. SIUS 47 (US 1482 × Darrow) × Thornfree; cross made in 1964; selected in 1967 by J.W. Hull; tested as SIUS 64-21-8. Tree: thornless; semi-erect; hardier, more vigorous, and more productive than Thornfree; vigorous prirnocanes of mature plants may grow 12-15 ft in length and 1 1/2 inches in diam.; does not sucker readily; tolerant to septoria leaf spot and anthracnose, somewhat tolerant to mildew. Fruit: clusters contain 20 or more large blackberries, which become slightly dull in appearance at maturity; flavor markedly less astringent than Thornfree; ripens first 2 weeks of July, 3 weeks before Thornfree.
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