Orris Root: The Hidden Floral Ingredient Behind Fine Perfumes
Orris root is one of the quiet stars of the fragrance world. When it is first dug up it has almost no scent at all, yet after years of patient drying it becomes one of the most valued and expensive raw materials in perfumery.
Not a root, and not a flower scent
Despite the name, orris is not a root but a rhizome, the thick underground stem of certain irises, chiefly the German iris (Iris germanica) and the sweet iris (Iris pallida). Iris pallida is cultivated in the Chianti region of Italy for its fragrance. The genus name comes from the Greek word for "rainbow", which is also the name of the goddess of the rainbow, and some authors link it to the wide range of iris flower colours. The red fleur-de-lis in Florence's coat of arms and flag comes from a white iris that grew in and around the city.
Freshly dug iris rhizomes contain no irones at all. The violet-like scent is built slowly, over years of storage.
Why years of drying matter
Freshly harvested rhizomes contain no irones, the molecules behind the scent. They develop slowly during storage and are thought to arise from the oxidative breakdown of triterpenoid compounds in the rhizome. Research notes that the scent builds gradually and peaks after about three to four years of storage of the peeled rhizomes. In perfumery, rhizomes are harvested, dried and aged for up to five years, during which oxidation produces fragrant compounds with a scent said to resemble violets.
A famously expensive extract
The aged rhizomes are steam-distilled to make a thick oil, often called orris butter or iris butter. The yield is tiny: oil of orris makes up only about 0.1 to 0.2 percent of the root, so a tonne of rhizome gives around two kilograms of oil. It has been described as the most expensive substance used in the fragrance industry.
A classic fixative
Beyond its own soft, woody, violet-like scent, orris is valued as a fixative, a material that helps other aromas last. It is used:
- In perfumery, as a base note and one of the main iris components
- In potpourri, where it is described as the most widely used fixative
- In gin, as a botanical in many brands, for flavour and colour
- In spice blends, such as ras el hanout
- In confectionery and flavouring, historically, for example as a base for nonpareils and in tinctures for syrups
In Japan, roots and leaves of the iris were traditionally hung in the eaves of houses to ward off evil spirits.
Using orris root at home
Cut or powdered orris root is easy to use in craft projects. Add it to homemade potpourri to anchor the scent, put a little into sachets for drawers and linens, or use it in your own aromatic blends. Store it in a closed jar, away from heat and light.
How to use
Orris root is used in small amounts only; the fresh root can irritate. Dried, diced pieces are traditionally chewed in small bits, ground into tooth powders, or used as a natural fixative in potpourri, sachets and homemade perfumes.
Not for use during pregnancy or breastfeeding, or for children.
Did you know?
Oil of orris makes up only about 0.1 to 0.2 percent of the root. A tonne of rhizome yields roughly two kilograms of oil.
Sources
- Wikipedia: Orris root
- Wikipedia: Iris (plant)
- Wikipedia: Iris pallida
- University of Bristol, Molecule of the Month: Irone (origin)
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