40-50 days to maturity. Brassica oleracea var alboglabra ‘Early Jade’. Early Jade Chinese Broccoli Seeds. Non-GMO, Hybrid, Cool-season Annual. Closely related to European cabbage, Chinese Broccoli was introduced to China in ancient times and quickly accepted into the local cuisine. The leaves are big and dark green with thick stems. Early Jade is slow bolting, and early maturing, with good uniformity. Suitable for growing at different times of the year. This variety is ideal for full-size and baby-size production. Approximately 9,000 seeds per oz.