Ziziphus zizyphus (from Greek ζίζυφον, zizyfon), commonly called Jujube, Red Date, or Chinese Date, is a species of Ziziphus in the buckthorn family Rhamnaceae, used primarily for its fruits.
The tree tolerates a wide range of temperatures and rainfall, though it requires hot summers and sufficient water for acceptable fruiting. Unlike most of the other species in the genus, it tolerates fairly cold winters, surviving temperatures down to about −15°C. This enables the jujube to grow in desert habitats, provided there is access to underground water through the summer. Virtually no temperature seems to be too high in summertime.
The freshly harvested as well as the candied dried fruits are often eaten as a snack, or with tea. They are available in either red or black (called hóng zǎo or hēi zǎo, respectively, in Chinese), the latter being smoked to enhance their flavor.
The jujube’s sweet smell is said to make teenagers fall in love, and as a result, in the Himalaya and Karakoram regions, men take a stem of sweet-smelling jujube flowers with them or put it on their hats to attract women.