Tisanes are made from the fresh or dried leaves, bark, roots, seeds, fruits and flowers of various plants ~ other than Camellia sinensis.
There is a marked difference in the brewing process of teas and Tisanes. Green tea for example, needs water that has cooled down from the boil and a steeping time between half a minute and two minutes. If the water is too hot, or the steeping time to long, your tea will become bitter.
Tisanes on the other hand need water that has just boiled, and the steeping time (depending on the herb) is anything between four and fifteen minutes. Both the boiling water and the length of steeping, release the aroma and the health properties of the herb.