Asarabacca

An asarabacca is a tall plant that gives gooseberry size red fruits. These fruits, which have no real taste, have the ability to appease animals if they eat them.
A beast creature that ingests asarabacca fruit becomes docile and incapable of violence for the next hour, unless of course you show aggression towards it, in which case its nature quickly takes over. These fruits have no effect on humanoids or monsters.