Related Clues:

• Poison --
• Poison ivy, e.g.
• Poison ivy's cousin
• ''Poison'' plant
• Ornamental tree
• Staghorn, for example
• Grower in a pot
• Itch-causing plant
• Greenhouse growth
• Oxygen producer
• Botanist's study
• Flower or weed
• Covert agent
• Shrub often toxic
• Poisonous shrub, perhaps