Shandingzi generally refers to Shanjingzi. Vitex negundo: Deciduous tree, with a height of 4-5m and a maximum of10m. Grayish brown, smooth, not easy to crack. The new buds are yellow-brown, glabrous. Cranberry, also known as cranberry, is an evergreen shrub dwarf vine of Vaccinium in Ericaceae. The whole looks like a crane, and the flowers are like the head and mouth of a crane, so cranberries are also called "cranberries". Its fruit is an oval berry, 2 ~ 5 cm long, which turns from white to crimson and tastes sour and slightly sweet.

Cranberries have a long history of cultivation in the North American continent, and the local Indian indigenous department was the first to eat cranberries. They make cranberries into jam, dried fruits and other foods; Also apply cranberry juice to heal the wound; Dye cloth with dyes. /kloc-in the 0/5th century, European colonists landed on the North American continent for the first time, and various diseases appeared because they did not adapt to the environment. Indians introduced cranberries to immigrants. The health care function of cranberries has played a great role in the health recovery of European immigrants. They fell in love with this cranberry, planted it, and soon invented a new cranberry food formula, including sauce, pie and juice, and provided it as Thanksgiving food.