Related Clues:

• Itch-causing plant
• Snake venom, for one
• Source of harm
• Bad thing to take in
• Pesticide ingredient
• As, in the lab
• Shrub often toxic
• Poisonous shrub, perhaps
• Scourge of one's existence
• ''___ funny, McGee!''
• Lethal agent
• Sometimes-poisonous shrub
• Garlic, to a vampire
• Ruin morally
• Opposite of purify