Here is a list of common toxic plants and also household chemicals:

http://www.plannedparrothood.com/plants.html

There are several of these on the web, just search on 'plant toxic to birds' and they'll come up, if any of your plants aren't on this list.

Don't count on chickens to be too smart as far as knowing what to avoid--play it safe and eliminate any toxins yourself. :)

Velvet ~:>

We have all of the plants you have plus others that are supposedly poisonous and have never had a chicken die from free-ranging and eating what they want.

I don't believe they would eat something that would kill them in spite of their tiny brains. That said, we garden organically and don't use synthetic fertilizers, pesticides or fungicides on our property. That might be more of a danger than actual plants.