Black jujube (narrow black jujube or true black jujube), whose scientific name is Junqianzi, persimmon lotus, also known as wild persimmon, soft jujube, milk jujube, milk persimmon and wild persimmon, is widely distributed in northern China. "Black jujube" is a natural black, although it is also called jujube, but it does not belong to the jujube we usually know, but is a persimmon plant native to Northeast Asia. Mainly divided into two kinds: nuclear and non-nuclear. The main varieties are black jujube, milk jujube and grape jujube.

Black dates are different from black dates. Black dates are black dates, which are made of fresh dates (red dates) through special processing (cooking in oil and smoking) and belong to the dried products of fresh dates. The color is black, so it is also called "black jujube" (common name smoked jujube, amethyst jujube, Maya jujube and Goutou jujube). Although this kind of black jujube is also rich in nutrition, it still belongs to jujube, which is completely different from the black jujube in the traditional kidney-tonifying food "Black Five Categories".