As the laurel adorns Apollo and distinguishes him, so the ivy, Dionysus. This is the reason why he is called “the ivy-crowned” … The myth says that the ivy appeared simultaneously with the birth of Dionysus in order to protect the little boy from the flames of lightning which consumed his mother.
Otto establishes ivy as the essential vegetal emblem of Dionysus, tracing its cult presence from tattooing to thyrsus-wrapping and grounding its mythological origin in the protective miracle at the god’s fiery birth.
, Dionysus Myth and Cult (1965), 1965thesis