Qiyechangbai and Hadacong1 were used to study the relationship of the leaf age of overwinter to bolting and returning green by the difference of sowing time.The results showed that the earlier the seeds were sown,the older leaf age of overwinter was,the higher the rates of returning green and bolting rate were,the earlier the bolting time was.The leaf age of overwinter of Qiyechangbai sown August 31 to September 14 was 2.1-3.1 leaves and the rate of returning green was 86.5%-92.1%,while the leaf age of overwinter of Hadacong1 sown September 7 to September 14 was 2.3-2.7 leaves and the rate of returning green was 88.5%-93.8%,both varieties didn't bolt.In addition,in the same sowing time,the bolting rate of Hadacong1 was higher than that of Qiyechangbai slightly.
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