A peppermint plant has green stems and leaves with purple flowers that grow in clusters at the top. It can reach heights between 1 to 3 feet tall and is native to Europe and Asia, thriving in moist, temperate climates with hard soil that does not require daily watering. Peppermint is useful for its minty scent and flavor in toothpaste, tea, and medicines to aid digestion and soothe upset stomachs or headaches.