When my garden is finished producing this fall, I am planning on having my chickens (and goats) free range in it. Are there any vegetable plants that are dangerous for them? I grow corn, potatoes, melons, watermelons, peppers, cucumbers, various herbs, peanuts (we tried just for fun!), tomatoes, green beans, celery, strawberries (this area is fenced separately - I'm going to try and keep them out), and broccoli. Can I safely assume that they will instinctively not eat anything that is harmful?