I noticed a post about plants that are harmful to Hen's, but I cannot find
it now.

If anyone knows of any plants that can harm hen's etc, I would be really
grateful.

My brother & sister in law have just got some hen's and a cockerel, they let
them wander all over the place and they are about to start growing veg and
herbs etc, I thought it would be good to let them know of any possible
dangers.

Thanks in advance.

Rosie.