This is a seed collection method adopted in most areas of the country, and the mother plant uses mature large bulbs. Sow from September to October of the first year, and the seedlings are exposed or stored for overwintering in winter. The big bulbs are harvested in the summer of the second year, and good individuals are selected. After storing 4, the susceptible plants are eliminated. The field will be planted from September to November. The cue ball will be planted in the third year of the severe cold area. The seeds will be harvested in June. 21 to 23 months. The seed collection method has undergone multiple selections in the field and storage period, and its variety purity and seed quality are significantly higher than that of the two-year seed collection method, and can be used for original seed production. The disadvantage is that the seed collection cycle is long, the storage is troublesome, the large bulbs are used more, and the cost is high.
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