GREENS, HERBS AND FOUGERES / green · floral · aromatic
Yarrow
Category
GREENS, HERBS AND FOUGERES
Subcategory
green · floral · aromatic
Origin
Volatility
Heart Note
Botanical
Achillea millefolium
Appearance
blue clear liquid
Odor Strength
Medium
Producing Countries
Asia, Europe, North America
Pyramid
Heart
Bitter, green, ink-blue. Yarrow smells like chamomile stripped of sweetness -- camphor, crushed leaves, the cold sharpness of an herb garden in early morning. The oil is vivid blue, an artifact of distillation, not of the living plant.
Bitter, dry, herbaceous-green with a cold camphoraceous edge. The opening is sharp and penetrating -- eucalyptol and camphor, like sniffing rosemary's more austere cousin. Behind the sharpness, a blue-inky quality from chamazulene that recalls German chamomile oil but stripped of its warmth. The mid-notes are sage-like, woody, with a faint tea-sweet caramel from bornyl acetate. Drier and more angular than chamomile, less anisic than tarragon, less aggressive than wormwood. The bitterness is clean and bracing -- tonic water rather than cough medicine. In the base, a quiet earthy-woody residue from the sesquiterpene fraction (caryophyllene, germacrene D) persists with surprising tenacity.
Evolution over time
Immediately
Immediately
Sharp camphor-eucalyptol burst, bitter green, penetrating herbaceousness. A cold, astringent clarity -- like sniffing crushed yarrow leaves on a wet morning.
After a few hours
After a few hours
The camphor recedes. A dry sage-rosemary character emerges, woody and faintly tea-sweet from bornyl acetate. The blue chamazulene facet becomes recognizable -- inky, herbal, chamomile-adjacent but without the warmth.
After a few days
After a few days
A quiet, earthy-woody sesquiterpene residue. Caryophyllene and germacrene D provide surprising persistence -- 8-12 hours on skin. The bitterness mellows to a clean, austere dryness.
Terroir & Transformation
Indicative 2025 wholesale prices.
The Full Story
Yarrow (Achillea millefolium, family Asteraceae) produces a chemically variable essential oils in perfumery. GC-MS analysis across European populations reveals at least thirteen recognized chemotypes -- chamazulene, sabinene, beta-pinene, 1,8-cineole, camphor, linalool, alpha-thujone, beta-thujone, ocimene, ascaridole, caryophyllene oxide, beta-eudesmol, and alpha-bisabolol. A Hungarian sample may be dominated by sabinene (up to 16.5%) and beta-pinene (up to 23.3%), while a French sample shows camphor (12.8%) and germacrene D (12%). No two origins smell alike.
The oil's vivid blue color comes from chamazulene (CAS 529-05-5, C14H16), which does not exist in the living plant. During steam distillation, the proazulene achillicin -- first isolated from A. millefolium by Banh-Nhu and Gacs-Baitz in 1979 -- decomposes through chamazulenic acid into chamazulene via heat-driven decarboxylation. The same mechanism produces blue German chamomile oil from matricin. Chamazulene content in yarrow oil ranges from 0.8% to 44.3% depending on ploidy level, origin, and distillation duration. Prolonged distillation increases chamazulene yield. Tetraploid populations produce the richest azulene profiles; hexaploid populations yield only traces.
The scent is drier, more angular, and more bitter than German chamomile. Where chamomile gives a warm herbal sweetness, yarrow gives astringent green bitterness with camphor-eucalyptol coolness and a faint, tea-like woody undertone. The fruity aspect sometimes noted -- a delicate caramel sweetness -- comes from bornyl acetate (up to 15.8%) and is more evident in certain Eastern European chemotypes.
Production is concentrated in Bosnia, Hungary, France, and the United States. Wild-harvested material dominates. Oil yield is low and variable: 0.2-0.5% from inflorescences, 0.02-0.07% from leaves and stems. Holmes estimates 250 to 1,000 kg of herb per 1 kg of oil. The high cost and chemical unpredictability limit yarrow to niche and natural perfumery.
In 1960, archaeologist Ralph Solecki found yarrow pollen clustered around a 60,000-year-old Neanderthal skeleton (Shanidar IV) in a cave in Iraqi Kurdistan. He proposed the 'flower burial' hypothesis -- that Neanderthals deliberately placed medicinal plants, including yarrow, with their dead. The idea was romantic and influential. In 2023, a palynological re-analysis published in the Journal of Archaeological Science suggested the pollen clumps were more likely deposited by nesting solitary bees. The debate remains open.
Extraction & Chemistry
Extraction method: Steam distillation (hydrodistillation) of dried aerial parts -- leaves, stems, and flowering tops -- harvested at or just before peak flowering for maximum oil content. Oil yield is low: 0.2-0.5% from inflorescences, 0.02-0.07% from vegetative parts. An estimated 250-1,000 kg of herb produces 1 kg of oil. Approximately 20% of the oil emulsifies in the hydrosol and is lost. Distillation time affects composition: longer runs (2-3 hours) increase chamazulene content as more proazulene (achillicin) undergoes thermal decomposition. CO2 supercritical extraction has been studied and yields roughly three times more material (1% vs 0.3%) but with a different chemical profile -- less chamazulene, more intact sesquiterpene lactones. Major production: Bosnia, Hungary, France, United States. Most commercial material is wild-harvested.
No specific IFRA standard for yarrow oil as such. However, the oil may contain IFRA-restricted constituents depending on chemotype: thujone (in thujone-dominant chemotypes), camphor, and 1,8-cineole. Formulators must verify batch composition via GC-MS and ensure compliance with constituent-level IFRA limits.
Synonyms
MILFOIL · SOLDIER'S WOUNDWORT · HERBA MILLEFOLII
Physical Properties
Odor Strength
Medium
Lasting Power
396 hours at 100.00%
Appearance
blue clear liquid
Flash Point
129.00 °F. TCC ( 53.89 °C. )
Specific Gravity
0.92000 @ 25.00 °C.
In Perfumery
Yarrow oil functions as a heart-note modifier in herbal, aromatic, and fougere compositions. Its primary contribution is cold, bitter-green complexity -- the Asteraceae signature -- delivered with more dryness and angularity than chamomile or davana. At trace levels (0.1-0.5%), it sharpens lavender and sage accords with camphoraceous bite. Effective in absinthe-type reconstructions, apothecary accords, and green chypre structures that need medicinal edge without overt sweetness. The oil blends with lavender, clary sage, artemisia, vetiver, oakmoss, and cedarwood. Its high chamazulene content gives it anti-inflammatory properties that can be marketed in dual-function (scent + skincare) formulations. The blue color requires formulation care -- it can tint transparent products. Yarrow is rare in mainstream perfumery due to chemical variability between batches, high cost, and limited supply. It appears most often in natural and niche compositions.
