Onions, also known as shallots and green onions, are usually sown in early September of the first year and harvested in the second year. The growing period is about 330 days, but the specific time depends on the climate of the planting area. The growth of onion will go through many stages, such as seedling stage, vigorous growth stage and bulb expansion stage. These plants are sown in September in autumn and mature in June the following year.

Growth process of onion

1. Seedling stage: The seedling stage of onion is from the first true leaf to plant planting. During this period, plants grow slowly and their leaves are small and weak. 2. vigorous growth period: during this period, onions will grow roots and leaves one after another, the root system will grow rapidly, the leaf area will increase significantly, and assimilation will be strengthened. 3. Bulb expansion period: Onion bulbs will mature rapidly during this period, until the leaves begin to turn yellow and get old before harvest, and the bulb weight reaches the maximum at about 15 days before harvest.

Maintenance and management of onion in growing period

1. Irrigation should be controlled at onion seedling stage, and topdressing should not be allowed, so as not to reduce the overwintering ability of plants. 2. Onions need to be watered and topdressed in time during the vigorous growth period. Nitrogen fertilizer should be the main fertilizer, which can promote the growth of aboveground parts and the expansion of bulbs.