Herb glossary

Yarrow

Achillea millefolium

Family: Asteraceae · Parts used: Flowering tops

Yarrow (Achillea millefolium) is the legendary 'master of the blood' of Western herbalism, a diaphoretic for the early hours of fever, an astringent for wounds and bleeding, and a cyclic-support ally with one of the longest medicinal records of any plant.

Traditional uses

Yarrow (Achillea millefolium) takes its Latin name from the Greek hero Achilles, who in legend used it to staunch the wounds of his soldiers, the plant has been a Western battlefield and household medicine for at least 3,000 years. Archaeological evidence places yarrow in Neanderthal-era burial sites in present-day Iraq, suggesting medicinal use predates written history by tens of thousands of years. Today it remains one of the most universally-applicable herbs in Western clinical herbalism.¹

Primary therapeutic territory

Yarrow's signature is the diaphoretic-and-astringent combination, it helps the body sweat through a fever (especially when taken hot at the very onset of cold or flu) while simultaneously toning and astringing tissues. This makes it an unusually versatile herb: useful for the first hours of viral illness, for wound bleeding, for menstrual flow that is excessive or unpredictable, and for the kind of cold-and-clammy-but-can't-quite-sweat presentation of low-grade illness. Together with elderflower and peppermint, it forms the classic European cold-and-flu trinity.²

Other traditional uses

First-onset fever support. Yarrow's signature use. Hot tea, in bed, at the very first signs of cold or flu, exactly the pattern in our Flu Fighter Tea.
Wound healing. Topical yarrow poultice or yarrow-infused water as a wound wash has a 3,000-year traditional record. The astringent and mildly antimicrobial qualities make it a foundational first-aid herb.
Heavy or irregular menstrual flow. Traditional use as a uterine astringent for excessive bleeding. Consult a clinician for any sudden change in menstrual pattern.
Mild hypertension. A traditional reputation as a circulatory regulator; some studies suggest a mild blood-pressure-lowering effect.
Digestive bitter. The bitter quality stimulates digestion and liver function; useful for sluggish digestion or stress-skipped-meals patterns.
Mild urinary support. Diuretic and mildly antiseptic, similar profile to goldenrod for early prodromal urinary symptoms.

Yarrow's three colors

Wild yarrow appears in white, pale pink, and occasionally yellow forms. The medicinal action is essentially the same across colors. Cultivated ornamental yarrow varieties (the brilliant reds and golds in garden centers) are bred for appearance rather than aromatic potency; medicinal yarrow should be wild-type or sourced from medicinal-cultivated stock.

How we use yarrow at Gaia’s Garden

At Gaia's Garden Organics, yarrow (Achillea millefolium) grows in our medicine garden in Umpire, Arkansas. We harvest it ourselves, by hand, at the moment its medicine is at peak.

In our formulas

Gaia's Flu Fighter Herbal Tea: Classic diaphoretic, traditionally used to support the body's natural fever and sweating response during seasonal challenges. Named after Achilles in Greek herbal lore.

Safety & considerations

Yarrow has a long traditional safety record but does have several specific cautions worth flagging.

Pregnancy

Yarrow is contraindicated during pregnancy due to its uterine-stimulant action and traditional use as an emmenagogue. Avoid throughout pregnancy. Postpartum use is more open and is part of some traditional postpartum tea blends.

Asteraceae (daisy family) allergy

Yarrow is in the Asteraceae family alongside ragweed, daisies, marigolds, and chamomile. People with severe allergies to other Asteraceae plants may cross-react. Introduce in small amounts.

Bleeding, surgery, and anticoagulants

Yarrow has a paradoxical reputation as both a wound-healing styptic (externally) and a mild anticoagulant (internally). Discontinue at least two weeks before planned surgery, and consult your physician if you take warfarin, apixaban, or daily aspirin.³

Drug interactions

Theoretical caution with antihypertensive and sedative medications due to mild additive effects. Generally well-tolerated otherwise.

Photosensitivity

A small percentage of people are photosensitive to yarrow externally. If you apply yarrow topically and notice unusual sun-related skin reactions, discontinue.

Children and pets

Mild yarrow tea has traditional pediatric use during the very first hours of cold or flu, small doses, well-strained. For pets, yarrow has been used externally as a wound wash by holistic veterinarians; internal use should be discussed with a veterinarian.

Frequently asked

When exactly do I take yarrow for a cold?

At the very first signs, the chill, the body ache, the early sore throat, the just-getting-sick-but-not-fully-yet feeling. Yarrow's strength is in pre-empting or shortening the early phase of viral illness, not treating an established cold or flu. Take it hot, ideally in bed, with the bedclothes on so the diaphoretic effect can do its work.

Yarrow vs elderflower for fever?

Both diaphoretics, often combined. Yarrow is more astringent and pulls toward circulation regulation; elderflower is gentler and pulls toward upper-respiratory soothing. The classic cold-and-flu protocol uses both together along with peppermint, that's the formula we use in our Flu Fighter Tea.

Can I use yarrow for wounds?

Yes, topical use of yarrow on minor cuts and scrapes has a 3,000-year traditional record. A poultice of crushed fresh leaves or a wash of strong cooled yarrow tea is the traditional preparation. For serious wounds, deep cuts, or anything that won't stop bleeding, see a clinician.

How does yarrow taste?

Sharply aromatic, slightly bitter, and a little astringent, not as harsh as wormwood or blue vervain, but distinctly medicinal. Yarrow tea is generally drinkable on its own; many people prefer it combined with sweeter herbs (peppermint, elderflower, lemon balm) in formula.

Is yarrow safe for kids?

Mild yarrow tea, well-strained, has traditional use during the first hours of childhood cold or flu, small amounts only. As always, consult your pediatrician for children with chronic conditions or on medication, and seek medical attention for high fevers in young children rather than relying on herbs alone.

Can pets use yarrow?

Externally, yarrow has been used by holistic veterinarians as a wound wash for centuries. Internal use requires veterinary supervision, yarrow is not toxic to dogs or cats in moderate amounts but its astringent action and potential for compounded effects with medications mean it isn't a casual choice.