An early ripening, dark blue-black skin, reddish flesh, Japanese-American hybrid plum. Origin: University of Wisconsin, River Falls, by B.R. Smith. Oka × Z’s Blue Giant; tested as 98-95-21-1. USPP 16,621; 6 June 2006. Tree: small, dwarfish; medium vigor; slightly upright; superior winter hardiness; heavy production and precocious; self-infertile, very little pollen; blooms 25 Apr. to 1 May. Fruit: medium, 55 mm diameter; globose; skin dark blue-black, glabrous; flesh red-purple; semi-freestone; 14% SS; ripe 6 Aug., 2–4 weeks before other large-fruited plums.
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