The onion we usually see is actually an underground abnormal stem, that is to say, a bulb. Many people think that it is dug out from the bottom, and that this is its root, which is a wrong cognition. The onion can be peeled off, and its bottom is a bulb plate, which is flat, and the middle part also has terminal buds, from which the leaves grow. In addition, there will be a layer of scales around the top bud, which will become bulbs after overlapping growth.
It is biennial or multi-year. It has no main root. The root is a stringed fibrous root, and it grows at the base of stem. Its root system is very weak, and its ability of absorbing water and fertilizer is not very strong. The leaf is dark green, in the shape of a cylinder, and the surface of the leaf is also attached with a relatively thick layer of wax powder, which is actually the feature of its drought resistance.
Its flowering and fruiting period is from May to July. The flowers are pink and white. The perianth is green and oval.
