Wolfsbane in Bloom is a mythos card. It first appeared in the Miskatonic Horror expansion.
Mythos Type: Environment (Mystic)
Gate Opens: Devil Reef or Unvisited Isle
Clue Appears At: Esoteric Order of Dagon or Science Building
Mythos Ability: Monsters with Magical Immunity are treated as having Magical Resistance instead and have their toughness increased by 1.