I am having trouble finding sources of seed for marrowstem cultivars of kale (Brassica oleracea L. var. acephala). This is a fodder crop I am interested in studying for its allyl isothiocyanate properties. Suggestions as to references will be most appreciated. Please reply also to sigma@ix.netcom.com. Many thanks!
First places I'd look are Cornucopia II (Kampong Publications) Garden Seed Inventory (Seed Savers Exchange)