Hainan green kumquat can be planted 50 green kumquat trees per acre of land, and each tree can produce around 50 to 100 pounds.
The green kumquat Hainanese people commonly known as Gongsun orange, tangerine or sour orange, Taiwan people called kumquat, Singaporeans are called sour citrus, used to make sour citrus water to sell; for the Rutaceae citrus family kumquat genus, the head of a smaller, an average of about 15 grams.
The kumquat is mainly produced in Hainan, China and Vietnam. But the fruit of Vietnam due to climate and varieties of problems, in taste and quality are not as good as Hainan kumquat, in Hainan's Haikou City, the planting of kumquat about more than 2,000 acres, with an average annual output of nearly 20,000 tons.