My pen is about 15'x30' and I have a feeling the grass won't come back this spring with the pecking and scratching. There is a total of three hens,a buff orpington, banty and wild turkey. Is there a type of plant or bush I could plant in there that will get pretty big and good for them to peck at? I had swiss chard planted and they loved it but pecked it to death after about 6 months. I would appreciate any ideas. Thanks PS live in central TX, pen is not covered...has an attached coup.