Broccoli Seeds - Chinese Broccoli - Big Stem or Regular size. Heirloom, Non-GMO. Brassica oleracea var alboglabra. 60 days. Cool season annual. Chinese broccoli is a popular Chinese green vegetable and is grown for its stalks and leaves. This open pollinated variety has deep green color, good flavor and BIG stems that are crisp and excellent for slicing. Stems are 12-18" at harvest, tolerant to cold, and slow bolting.