Grand Duke is a variety of plum, one of the so-called European plums. It is one of the many plums produced by Thomas Rivers of Sawbridgeworth, England. The Royal Horticultural Society awarded it a First Class Certificate in 1880. The fruit has a fairly firm, rather dry flesh with a slightly tart to slightly sweet flavor. It can tolerate USDA hardiness zones 5b, 5a, 6b, 6a, 7b, and 7a.

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