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Lettuce origin of the Mediterranean, in 4500 BC lettuce in the Mediterranean coast cultivation common. 16 century in Europe is now "a ball lettuce and purple lettuce; 16-17 th century knit lettuce and purple lettuce records. About the 5 th century lettuce was introduced into China, the world common cultivation with lettuce leaves, distributed mainly in Europe, America, China north and south is all over with lettuce stem-lettuce cultivation is given priority to, with lettuce leaves more distributed in south China, Taiwan is particularly common plant. 80 s, "ball lettuce in Beijing and coastal cities also have development.