Herb

noun

1. Any green, leafy plant, or parts thereof, used to flavour or season food.
2. A plant whose roots, leaves or seeds, etc. are used in medicine.

   "If any medicinal herbs used by witches were supposedly evil, then how come people from at least the past benefited from the healing properties of such herbs?"

3. Marijuana.
4. A plant whose stem is not woody and does not persist beyond each growing season
5. Grass; herbage.