I give my girls their fermented feed (along with some 3-way scratch, some nuts, oatmeal and kale every morning and they're on it like crazy. I was watching them the other day and all of them were going to town on a small weed just outside of their run. Fortunately I have this weed all of the place on our property (I looked it up and it's a type of wild cabbage). I got a bunch of leaves and put them into the run. They just scratched and picked at it. This morning I put a bunch just outside the fence and you would have thought it was the greatest thing since creamed butter. Why they like it because they have work a bit for it...who knows.
But it is nice to know that having this wild cabbage in the yard will help augment their diets. I'm all about saving $$.