Could you clarify—are you asking about a literal plant that’s physically or chemically powerful, or more like a metaphorical or symbolic “powerful” plant?
Based on the phrasing, one strong contender is cannabis (marijuana) because of its psychoactive properties and wide-ranging medicinal effects. Other possibilities could include:
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Coca plant – source of cocaine, historically considered “powerful.”
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Belladonna (Deadly Nightshade) – extremely toxic, historically used as a poison.
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Ginseng – often called “the king of herbs” for its medicinal potency.
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Neem – used extensively for its medicinal, pesticidal, and antimicrobial properties.
If you’re thinking in a more literal sense of strength or influence, I’d say cannabis or belladonna usually top lists.
I can make a short list of the 5 most powerful plants in the world with reasoning if you want—it’s quite fascinating. Do you want me to do that?