Orris

Orris root is a term used for the roots Iris germanica, Iris florentina, and Iris pallida.Once important in western herbal medicine, it is now used mainly as a fixative and base note in perfumery, the most widely used fixative for potpourri. Orris is also an ingredient in many brands of .
After an initial drying period, which can take five years or more depending on the use, the root is ground. For potpourri, this powder is used without further processing. For other uses, it is dissolved in water and then distilled. One ton of iris root produces two kilos of essential oil, also referred to as orris root butter, making it a highly-prized substance.