Natural Herbicide. Last week I was so glad to see/find someone with an appreciation of our walnut shavings. It's long been assumed that the natural toxins in walnut shavings can lame a horse. Well, our friend Bill Goode found a good use for them - as a natural herbicide. He's going to use these along the fence rows at his farm. He promises to give us an update to see just how good it's working.