(1) Autumn planting time: sow in early September of the first year, overwinter with seedlings, sow in the first half of May of the second year, harvest before winter, overwinter in cellar or open field, draw lots for flowering in the third year, and collect seeds in summer.
(2) Spring sowing time: Sow in early spring after soil thawing, and supply it as shallots before hot summer, or harvest it as dried shallots or ditched shallots in the same year after planting.
(3) Summer sowing time: It is usually planted from late July to early August, so it is also called "green onion". The plants were larger when overwintering that year.
2. Planting method of Shandong Welsh onion:
(1) Spring sowing and autumn sowing are generally adopted for the sowing date of Chinese onion, mostly autumn sowing, and the better sowing date is generally 10 every year.
(2) Before planting, separate the big and small seedlings, and eliminate the diseased seedlings, weak seedlings, over-small seedlings and obviously bent seedlings. The plant spacing is 35-40 plants per meter, the row spacing is 1 meter, and about 23,000 plants are planted per mu. When planting, the onion seedlings should be prevented from breaking, and the planting depth should not be buried deep. Too deep is not suitable for raising seedlings, too shallow will affect the length of onions. When planting, the leaves should be arranged vertically with the planting ditch, which is beneficial to close planting and management.
(3) The planting tools can be garden iron skewers or garden wooden poles with a diameter of about 1.5 cm. When planting, first make a shallow hole, vertical to the ground, then insert the seedlings, and then lift them up slightly, so that the roots spread down and keep the onion seedlings straight. If it is bent, the stem will bend until it is harvested later, which is a defective product.