Try collard greens, mine get apples, watermelon, pumpkins, turnip greens and grass clippings. I don't use any chemicals on my yard and I use an electric mower with a grass catcher to get grass for the chickens. I hope this helps.
Starting from scratch built a new coop. Went for off grid solar power. Still putting the final touches. Seems like a never ending project but the chickens love it.