1, woad may be the Ming and Qing dynasty white stalked cabbage, then called woad, is now Shanghai green or small rape, etc., and cabbage originated from woad, is woad and turnip natural hybridization.

2, cabbage is the ball cabbage, is a variant of woad, cabbage leaves part of a piece of stacked a piece of the form of wrapped together, that is, now the northern cabbage.

3, now on the market cabbage a **** there are two kinds, one is the stem round thick, slightly green, there is a stem round thin, white. Cabbage in ancient times called "woad", the Spring and Autumn and Warring States period has been cultivated in large quantities, the Tang Dynasty appeared white woad, purple woad and tripe woad and other different varieties.