花椰菜对环境条件反应敏感,生育适温范围比较窄,耐寒、耐热能力弱,故采种技术较为复杂。虽然北方有的地方留种获得了成功,但在豫北地区迄今尚无留种成功之先例.每年用种均需由外地调进,种源困难,价格昂贵,且难保质量。即便引来良种,也不能在当地安 Cauliflower is sensitive to environmental conditions, the scope of birth temperature is relatively narrow, cold, heat resistance is weak, so the seed collection technology is more complicated. Although success has been achieved in some places in the northern part of the country, no precedent has yet been established in northern Henan so far, and every species used must be transferred from the rest of the country and the provenance is difficult, expensive and difficult to maintain. Even if the introduction of seed, it can not be in the local security