0nion also known as green onion, it is genus Allium, 2-year-old herb. It is a common vegetable and it is easy to transport and store. According to the skin colour, it can be devided into white, yelloe and red onion three kinds. According to the shape of the bulb, it can be divided into the flat, oval, long ball, ball and oblate.

Onion is very nutritious, with highmedical value, is very healthful for people.