Late maturing Roderick F1 from Dobies. Sown in March last year, had them all Winter and. Still 2 more left in the ground. They stand really really well when mature and are happy with freezing nights, about the same as my brilliant Maximus brussels, right through until now. I know we can't save the seeds from these F1s but they really are worth it for certain crops. They also keep really well when cut and left in the fridge, red cabbage seem to like that twilight existence.