What three fruits created the boysenberry through deliberate horticultural crossing?

Answer

European raspberry, North American blackberry, and loganberry

The unique flavor complexity of the boysenberry is a direct result of its parentage, established through hybridization. This fruit is specifically noted as a cross involving the European raspberry, which contributes certain desirable traits; the North American blackberry, providing depth; and the loganberry, which influences the final sweet-tart balance. This specific genetic combination yields a profile that is less tart than a pure loganberry but more nuanced than a standard blackberry.

What three fruits created the boysenberry through deliberate horticultural crossing?
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