I have vegetable gardens and extensive flower beds and gobs of tropical/subtropical potted plants, flowers, fruit trees, vines etc. Here in FL there are lots of poisonous plants like sago palms (the seeds are poisonous), philodendron etc. etc. Plus, alot of the flowers I grow are supposed to be poisonous to chickens. My chickens have never been interested in eating the poisonous stuff. They do like to scratch and uproot everything though. The veggie garden is a different matter they will eat the fruits off of the plants as well as scratch around uprooting everything. I have them fenced in not free range. I let them free range a little from time to time but only under close supervision because we have tons of hawks and eagles that would get them during the day. Every afternoon I see several eagles circling around. I think they try to eat other birds and squirrels. I had an eagle try to get my pomeranian once too, so I know they would love chicken dinner.