(Stevia rebaudiana) A hard-to-find herb that is grown for the famous Stevia leaves which, when dried, are used to sweeten drinks and desserts. Much sweeter than sugar, stevia powder is reported to be 300 times sweeter! Not winter-hardy, except in zones 8-10. From Brazil and Paraguay. The chemical companies who make artificial sweeteners hate this plant and have tried to make it illegal--but we just love it!