60-70 days to maturity. Brassica oleracea var alboglabra ‘Late Jade’. Late Jade Chinese Broccoli Seeds. Non-GMO, Hybrid, Cool-season Annual. Originating in the Mediterranian, Chinese Broccoli was introduced to China in ancient times and quickly accepted as part of the local cuisine. The leaves are big and dark green with thick stems. Late Jade is slow bolting, late maturing, vigorous growing, and has good uniformity. Suitable for sowing from late spring to fall and planted year-round in sub-tropical areas. This variety is ideal for full-size production. Approximately 9,000 seeds per oz.