Elspeth Reoch, in 1616, when tried for witchcraft, acknowledged to having employed the Yarrow in her incantations. She "plucked one herbe sitting on her right knee, and pulling it betwixt the mid-finger and thumbe, and saying: In nominee Patris, Filii, et Spiritus Sancti."
By the yarrow plant so gathered, she was enabled to cure distempers, and to impart the faculty of prediction.
The Yarrow, from hiera, holy herb (Achillea millefolium), or Milfoil, is so called from the very numerous fine segments of its leaves. It is a Composite plant very common on waysides and in pastures throughout Britain.
The name Achillea has been bestowed thereupon because the Greek warrior, Achilles, is said to have disclosed its virtues which he had been taught by Chiron, the Centaur. This herb is the Stratiotes chiliophullos of the Greek botanists, by whom it was valued as an excellent astringent and vulnerary. But Gerard supposes it may have been the Achillea millefolium nobile, which grows with a thick root and longer leaves, on a fat and fruitful soil, a stranger in England, "and the very same with which Achilles cured the wounds of his soldiers." But, he adds, "the virtues of each sort of Milfoil are set to be both alike."
The flowers of the Common Yarrow or Nosebleed are white or pink; those of the Nobile are yellow.
The popular name of Nosebleed has been given to the Yarrow because the hairy filaments of the leaves, when put up the nose, provoke an exudation of blood, and will thus afford relief to headache, caused by a passive fulness of the vessels. Parkinson says "if it be pat into the nose, assuredly it will stay the bleeding of it," which mast be the' effect of action according to similars. Or if using Yarrow in the same way as a love charm, the following lines were repeated:--
"Green arrow! green arrow! You bear a white blow; If my love love me My nose will bleed now."
The leaves have a somewhat fragrant smell, and a bitterish taste. The odour of the flowers, when rubbed between the fingers, is aromatic. In consequence of this pungent, volatile principle, the herb has proved useful in hysteria, flatulence, heartburn, colic, and epilepsy; also, it is employed in Norway for the cure of rheumatism, and sometimes chewed for toothache.
Yarrow is one of the few aboriginal English plants, having held the primitive title, Gearwe. Greek botanists seem to have known the identical species which we now possess, and to have used it against haemorrhagic losses. It yields, chemically, a dark-green volatile oil, and achilleic acid, which is said to be identical with aconitic acid; also resin, tannin, gum; and earthy ash consisting of nitrates, phosphates, and chlorides of potash and lime.
For preparing an infusion of the plant, half an ounce should be boiled down in half a pint of water to six ounces; one tablespoonful for a dose.
Sir John Hill says the best way of giving Yarrow is in a strong decoction of the whole plant. A hot infusion of the herb taken freely on going to bed at night seldom fails to make short work of a cold.
A medicinal tincture (H.) is prepared from the whole plant with spirit of wine. This, when employed in a diluted form of the first or third decimal strength, and  in small doses of from five to ten drops in a tablespoonful of cold water, will act admirably in arresting nocturnal losses in the male; likewise bleeding from the lungs, the kidneys, or the nose, especially in florid, hectic subjects. It has been found by healthy provers that stronger, and larger doses of any preparation of the herb will induce or aggravate one or another of these bleedings.
The fresh juice of the plant may be had, a dessert-spoonful three times in the day; or of the volatile essential oil, from three to five drops for a dose. These medicines greatly stimulate and promote the appetite. "For ague," says Parkinson, "drink a decoction of the herb warm before the fit, and so for two or three fits together."
Externally, a strong decoction of the leaves has been used as an injection into the nostrils to stay bleeding from the nose. It is similarly of service for piles, and for female floodings, because exerting a special local action on the organs within the middle trunk. The bruised herb, or an ointment made from it, is applied by rustics to heal fresh cuts and contusions.
Even in ancient times it was famous as a topical remedy for piles. It is further of benefit for sore nipples as a lotion, and for a relaxed sore throat as a gargle: also as a hair wash.
The leaves were applied in former days as a poultice to wounds; and because of its healing and astringent virtues when so used, the plant gained the names Sanguinary, Thousand leaf, Old Man's pepper, Soldiers' Woundwort. Other local names for it are Staunch grass, Carpenters' weed, and Bloodwort: also, "Old Man's Mustard," "Bad Man's Plaything," and "Devil's Plaything." In Gloucestershire and some other parts, the double-flowered Yarrow is brought to a wedding by  bridesmaids as "seven years' love." In Cheshire, children draw the herb across the face to produce a tingling sensation, and they call it "Devil's nettle."
Culpeper spoke of the same as a profitable herb in cramps, and therefore called Militaris.
Yarrow, worn in a little bag over the stomach, was the secret (confided to Boyle) of a great lord against ague. A famous physician had used it with strange efficacy.
Similarly a charmed packet containing dried Yarrow has been credited with bringing success to its bearer, if at the same time he were admitted to the knowledge of a traditional secret (only whispered to the initiated) that this was the first herb our Saviour had put into His hand when a child.
Elspeth Reoch, in 1616, when tried for witchcraft, acknowledged to having employed the Yarrow in her incantations. She "plucked one herbe called Meleflower, sitting on her right knee, and pulling it betwixt the mid-finger and thumbe, and saying: In nominee Patris, Filii, et Spiritus Sancti." The Meleflower is the Achilloea Ptarmica or Sneezewort.
By the plant so gathered, she was enabled to cure distempers, and to impart the faculty of prediction.