85 Days. Brassica oleracea var. italica. Non-GMO. Open-Pollinated. Annual. Developed at the University of Massachusetts Amherst's historic research farm, Waltham Field Station, heirloom Waltham 29 broccoli garden seeds have been cultivated to deliver higher yields, grow more uniform vegetable crops, with more repeat harvests. Native to the brisk New England chill, non-GMO Waltham 29 seeds grow a compact, cold-hardy and open-pollinated American staple for home gardens and Farmers’ Markets across the country. Heirloom Waltham 29 broccoli seeds mature into robust 24-30" tall garden brassicas with classic blue-green floreted heads brimming with essential Sulforaphane.