I had a few like that too, and I fed the leaves to Bella until I got sick of it too and pulled them all out.
I've got some cabbages and brussell sprouts that never did anything. And they're still in the ground but I think it's time I pulled mine out too.
thats dissapointing, but sometimes it happens....either too cold to set, or too warm...Try again next year..............
I'd love to hear your thoughts...Thanks for taking the time to comment