Lettuce leaf with lettuce commonly known, Asteraceae lettuce genera. It is an annual or biannual herbaceous crop. It is also a popular vegetable in Europe and the United States, and it is deeply loved by people. Lettuce is native to the Mediterranean coast of Europe and is domesticated from wild species. It was first eaten by the ancient Greeks and Romans. Lettuce has a long history of being introduced into my country. It is cultivated more frequently in the southeast coast, especially in the suburbs of big cities, Guangdong and Guangxi, especially in Taiwan. In recent years, the cultivation area has expanded rapidly, and lettuce has also entered the tables of ordinary people from hotels and restaurants.