On the Flchams safe plant list they have chickweed listed, but I have found some contradictory information. It’s apparently toxic to all animals but usually only a problem when eaten in excess quantity. However, it seems cold blooded animals are particularly at risk. One account says the plant used to be thrown in streams to kill all of the fish so that hunters could easily harvest them. Does anyone here use chickweed or know whether or not it actually is toxic?