Mine don't eat it down to nubbins or anything, they have lots o'green here too, but everyday they graze on some of the comfrey.I think mine is the Bocking 14. I know for sure it's Bocking, one of the sterile seeded ones. My chickens have too much greenery to choose from, they're too picky now to eat the comfrey. When they were able to reach it some they nibbled on it from time to time but never really ate it up. I think the leaves are too fuzzy for their tastes.