The flowers usually begin to bloom three months after planting and last for about thirty days. Depending on the latitude, longitude and altitude, rapeseed flowers bloom from the end of December until the end of April of the following year. Rapeseed flowers bloom from January to March. Canola, alias Brassica napus (YUNTAI), Latin name Brassicacampestris, originated in Europe and Central Asia, is a cruciferous annual herbs. In China is concentrated in Jiangxi Wuyuan Huang (huáng) Ling, Hanzhong Basin and Jiangling ten thousand mu terraces, Yunnan Luoping Plain, Qinghai Menyuan Plateau and so on. Rape flower four petals, neatly around the stamen, simple personality. The petals are very delicate, with fine lines that even a skillful sculptor could not carve out. The center of the stamen bent together in a piece, as if in a whisper. It has a tough rhizome, dense leaves, with the same simplicity and ruggedness as the farmers who planted them.