Many people adore the sweet and tart flavor of raspberries, but that isn't all to be gained from a raspberry bush. Raspberries belong to the rose family, and they thrive in temperate regions all over the globe. Humans have cultivated raspberry plants for generations because of the desirable fruit. In that time, the herbalists of long ago also discovered that the leaves could be used to make herbal tea. Raspberry tea is smooth and mild in flavor, and is well suited by a bit of sugar or honey.