Stevia leaf tea is brewed from stevia leaves, which is sweet and can be put into a cup with 2-4 dried leaves, with a slight grassy flavor. Stevia leaf, also known as Stevia rebaudiana, is a kind of plant that can be planted in the garden. This plant belongs to Compositae and is native to South America. Stevioside was used in Paraguay, Uruguay, Argentina and parts of Brazil more than 200 years ago.