We let our hens free range every afternoon over our entire yard and woods. We're not heavy into landscaping but we do have a few Crepe Myrtles that we planted a couple of years ago that we would like to put something around. We've done brown mulch once and then pine straw once and our hens have completely destroyed both of them each time. They scratch all the stuff away from the trees in no time at all. Is there anything we can put around the trees that the hens either won't want to scratch in or that they can't scratch in? Thanks for any help anyone can offer!!