Tea can be made from fresh or dried herbs. Teas made from fresh herbs are light, with little color, and richly aromatic. Culinary herbs generally lend themselves well to fresh-plant teas because they have so many potent, delicious volatile oils. Those volatile oils also tend to hold up well to drying, so dried-plant teas can be equally aromatic, but they usually have a thicker, richer flavor and a darker color. Teas made from dried plants are richer in vitamins and minerals than fresh teas; the drying process breaks open the cell walls of the plant and gives the water greater access to plant constituents.
Use: Teas can be drunk hot or cold, but consider whether the temperature will add to the medicine. For example, if you have a head cold, hot tea will help break up congestion and expectorate mucus, whereas room-temperature or cool tea on a hot day will help you feel refreshed.