Understand what is going on in our Vanilla Rooibos Tea Bird Tea and why it is good for your health and well-being. Even though not technically teas, tisane teas are herbal teas which formed a major part of the tea world. It is the infusion or decoction made from a plant other than Camellia sinensis--the plant true teas (green tea, black tea, oolong, etc.) are made from. They are caffeine free and can be served hot or cold.