- You will get 1000 Seeds Broccoli Waltham 29 Non-GMO Heirloom Vegetable Seeds. - Genus: Brassica. - 1000 Broccoli Seeds Waltham 29 Seeds Non-GMO Heirloom. - Waltham 29" is a lovely and adaptable broccoli that can be successfully planted in both spring and fall. - Developed by the University of Massachusetts in the 1950's. - A delicious tasting broccoli with a pleasing dark green – sometimes even bluish – color.