Ok, so how bad are tomato plant for the chickens? Every day for the last few weeks the girls have been heading straight for the tomato plant when I let them out and have been downing as much as they can. I don't really care if the eat it, I've gotten all I wanted off of it, but is it bad for them? I do have a few with loose stools, would this be the cause? Most are only 5 months and I do have a couple Silkies that might be prone to poisoning. I also have a 1 year old RIR though that is fine and has no problems and eats the most. So just how bad is the tomato plant leaves?