Farmers are busy collecting the Chinese wolf-berry fruits in Zhongning County of Ningxia Hui Autonomous Region in northwest China, July 14, 2019. /VCG Photo

Ningxia is a leading production base of Chinese wolf-berry. The fruit is large and rich in flesh, with less seeds but high in sugars and nutrition. /VCG Photo

Described commercially as "red diamonds", Ningxia wolf-berries have been developed into a series of related products such as wolf-berry candy, wolf-berry tea, and wolf-berry wine. /VCG Photo

Also known as goji berry, the wolf-berry fruit has long been used in traditional Chinese medicine (TCM) or as a tonic element. /VCG Photo