Rubus phoenicolasius to give them their botanical name ( but also called Japanese Wineberry, Wineberry, or Wine Raspberry) is a species of raspberry that is native to northern China, Japan, as well as Korea. The Wineberry was first introduced into Europe as well as North America as an ornamental plant and for its potential in breeding hybrid raspberries. It has subsequently escaped from cultivation and become naturalised and sometimes invasive in parts of Europe and eastern North America. They are absolutely delicious and are coming into fruit now. They only open up their calyxes when the fruit is ripe and ready to eat.