I have a "leaf broccoli" that never heads up. It does put out small floral clusters AFTER OVER-WINTERING, and it is lovely in the early spring, in bloom before most things green up!
Growing it for the small leaves and tips, you should probably keep them trimmed low. Letting them become a mass of shrubbery like this is NOT the way to get tender young leaves.
Spigariello Liscia = Broccolo Spigariello =
Brassica oleracea var. 'Spigariello'
Very cold-hardy Italian Heirloom leaf broccoli
O.P. 45-65 days. Full Sun Annual .
12" - 24" tall, 16"- 24" spacing
deep blue-green leaves & tops: sweet, mild broccoli / kale flavor
Strip off center rib. Cooked leaves freeze well.
Direct-sow ⅛" deep or indoors, for transplanting after air stays above 25 ºF
Once established, OK above 25º.
Sorry about the "bondage"! After over-wintering, they wanted to flop over, and the neighbor on that side would have run them over repeatedly with her car.