Rubus × 'Darrow' is a vigorous, erect, thorny blackberry cultivar resulting from a controlled cross between the cultivars 'NY 15826' and 'Hedrick'. Released by the New York State Agricultural Experiment Station in 1958, it was bred specifically to address the need for cold-hardy blackberries capable of surviving harsh northeastern winters, a trait primarily inherited from the 'Hedrick' parent. While 'Hedrick' provided the essential winter dormancy and resilience, 'NY 15826' contributed to the cultivar's robust growth habit and consistent productivity. This hybridization produced a plant that remains one of the most reliable producers in temperate climates where other blackberry varieties often succumb to frost damage.

The fruit of 'Darrow' is large, long-conic in shape, and glossy black, known for a complex flavor profile that balances deep sweetness with a sharp, refreshing acidity. Unlike the modern thornless cultivars, 'Darrow' retains the formidable thorns of its wild ancestors, which are a phenotypic marker of its raw vigor and high resistance to common pathogens like orange rust. The significant Vitamin C content made the fruit a staple for both fresh consumption and the production of high-quality preserves that maintain their structural integrity and tartness through heat processing.