Vervain is a high ranking member of the Efrafan Owsla and the most hated rabbit next to Woundwort. He is deadly loyal to his Chief Rabbit and is known for threatening and bullying the weaker. At the end of the book he is killed by the labrador Bob after Woundwort is gone.
In the TV series he is more sly and cowardly. After Efrafa's destruction he tries to live on his own, but appears to be too weak to survive by himself. He continues to serve Woundwort after the old Efrafan leader saved him from a weasel. At the end of the series he runs away when the Black Rabbit of Inlé appears, and his further fate is unknown.