Method for breeding multi-bolting cold-resistant flowering cabbage

The invention discloses a method for breeding a multi-bolting cold-resistant flowering cabbage and belongs to the technical field of plant breeding. The method for breeding the multi-bolting cold-resistant flowering cabbage comprises the following steps: hybridizing purple flowering stalk with flowering cabbage to obtain a colony F1; selfing the obtained colony F1 to obtain a colony F2; selecting single plants consistent with breeding aims from the colony F2, and carrying out backcross on the selected single plants and the flowering cabbage; selecting single plants consistent with breeding aims in the backcross generation, and selfing the selected single plants; selecting single plants consistent with breeding aims in the selfing generation, and carrying out backcross on the selected single plants and the flowering cabbage to obtain the backcross generation; and then repeating selfing, so that the multi-bolting cold-resistant flowering cabbage is obtained. The method for breeding the multi-bolting cold-resistant flowering cabbage has the advantages that multi-bolting and cold-resistant characters of the purple flowering stalk are introduced into the flowering cabbage, the multi-bolting cold-resistant flowering cabbage variety is cultivated, and the multi-bolting cold-resistant flowering cabbage variety can grow in the Yangtze River region in autumn and winter due to the cold-resistant character; meanwhile, side flower stalk generative power is strong, side flower stalks are harvested mainly, one-time seeding and multiple harvesting are realized, a harvesting period is long, yield is high, and farming cost is reduced.