The flowering period lasts 20-30 days. Yunnan, Guangdong, Guangxi, Fujian and other places bloom from February to February, Zhejiang, Jiangxi, Hunan, Guizhou and other places from February to March, Jiangsu, Anhui, Henan, Shaanxi and other places from March to April, Gansu, Qinghai, Xinjiang and Northeast China from April to August. Rapeseed is the largest nectar source plant in China, and the flowering temperature of rape flower is 12 ~ 20℃.
Rapeseed is the largest honey source plant in China, and its cultivation range is almost all over the country, especially in Hubei, Sichuan, Hunan and Jiangsu. In addition, the sowing time of rape is divided into spring sowing and autumn sowing, among which autumn sowing is the most common in the Yangtze River basin and the middle and lower reaches of the Yellow River, and the second year harvest is the most common in Xinjiang, Gansu, Qinghai and Inner Mongolia.