What to grow for the hens?

I grow curly kale, I start it off in the greenhouse early and then transplant to growing position. It is good for us to eat as well the first early leaves are good for salads. The big main leaves last from summer to now. I still have green leaves on the plants though they have stopped growing now we have had snow on the ground since the last week november. The leaves are now all frozen but the hens still eat them.

I split the main stalk on sprouts cabbage etc then they pick out the middle bit