The breeder’s goal was to obtain a Japanese type plum hardy enough to grow in the upper mid-west. The fruit of this early season, dessert Japanese Plum x Western Sand Cherry Hybrid is sweet, juicy, nearly round & semi-clingstone with dark blue-black skin and a superior ripe flavor. Tree is precocious, has dwarf in growth habit and has Oka × Z’s Blue Giant genetics. USDA Hardiness Zones: 4. Trademarked as Black Ice™. This variety’s patent (USPP16621P2) expired on 2024-12-03.