- Our strain of Calabrese is VERY frost tolerant, if you are in a relatively cool area green sprouting broccoli may continue to produce for 6 months or longer.
Certified Organic by Oregon Tilth. Green Calabrese Broccoli Sprouting Seeds. Non-GMO, Heirloom Seeds. 60-90 days. Dark green 20-30 inch broccoli plants bear a close-beaded central head 3 to 7 inches across, followed by abundant side shoots. Its these side shoots that are the real treasure here, they continue to bear up to hard frost. Great seeds for vegetable gardening.