Thanks for posting this list. We were planning on wedging our small coop and run into existing landscaping. I had planned to move most of the plants in that area, but I'm rethinking the whole thing now. We have a lot of columbine and lily of the valley in that spot. I'd hate for those plants to come up from seed and root, and our chickens to have heart problems as a result.Here is a link to toxic plants for poultry to make a quick check on plants you are thinking about:
http://www.poultryhelp.com/toxicplants.html