A farmer collects dates from a palm tree at a date palm orchard during harvest in Abul Khassib, a town near the southern Iraqi city of Basra, September 5, 2016. [Photo/Agencies]

11. Date palm

The date palm was cultivated for its edible sweet fruit.

Jackfruit. [Photo/VCG]

12. Jackfruit

The jackfruit is native to parts of South and Southeast Asia, and is believed to have originated in the southwestern rain forests of the Western Ghats in the Indian subcontinent.

Black pepper. [File photo]

13. Black pepper

Black pepper is native to ancient Persia, the Arab world, and South India. Throughout the Tang Dynasty (AD 618-907), black pepper was introduced into China by merchants on the Silk Road, and became a popular spice for meat dishes among Tang people.

Pistachio. [File photo]

14. Pistachio

The pistachio, a member of the cashew family, was brought into China by the Arabs during the Tang Dynasty.

Spinach. [Photo/VCG]

15. Spinach

Spinach is thought to have originated in ancient Persia. The earliest available record of the spinach plant was recorded in Chinese, stating it was introduced into China via Nepal.

Sliced carrots exhibiting a broad range of naturally occurring carotenoid pigments in this image released on May 9, 2016. [Photo/Agencies]

16. Carrot

Carrots were originally cultivated for its leaves and seeds. The plant was first introduced into the western parts of China, and then Dunhuang of West China's Gansu province. It was then introduced into the central planes during the Yuan Dynasty (1271-1368).

A vendor stands behind watermelons displayed for sale in Kfar Tebnit village, southern Lebanon, August 18, 2016. [Photo/Agencies]

17. Watermelon

Watermelon, which originated in the desert of Africa, was brought along the Silk Road to western China and Ouigour – located in today's Xinjiang Uygur autonomous region – in ancient China. It appeared in Xinjiang during the early Tang Dynasty, and in China's inland between the Five Dynasties, Ten Kingdomgs (AD 907-960) and Liao Dynasty (916-1125).

A lettuce is pictured at Kajodlingen farm in Gothenburg, Sweden, September 28, 2016. [Photo/Agencies]

18. Lettuce

Lettuce originated from the Mediterranean coast, and appeared in China around the Sui (AD 581-618) and Tang dynasties.

Luffa. [File photo]

19. Luffa

The luffa, which originated in India, was introduced into China during the late Tang Dynasty and became a common vegetable in the Ming Dynasty.

A cabbage is seen at Augustenberg Botanical Roof Garden in Malmo, Sweden, September 14, 2016. [Photo/Agencies]

20. Cabbage

Cabbage, a leafy green or purple biennial plant, was domesticated in Europe before 1000 BC. It travelled through the western China before arriving in China by the Hexi Corridor, a part of the Silk Road in Gansu province.