Self-heal is edible: the young leaves and stems can be eaten raw in salads; the whole plant can be boiled and eaten as a potherb; and the aerial parts of the plant can be powdered and brewed in a cold infusion to make a tasty beverage.
Medicinally, the whole plant is poulticed onto wounds to promote healing. A mouthwash made from an infusion of the whole plant can be used to treat sore throats, thrush and gum infections. Internally, a tea can be used to treat diarrhea and internal bleeding.
The leaves are lance shaped, serrated, and reddish at tip, about 2.5 cms (1 inch) long and 1.5 cms (half an inch) broad, and growing in opposite pairs down the square stem. Each leave has 3-7 veins that shoot off of the middle vein to the margin. The stalks of the leaves are generally short, but can be up to 5 cms (2 inches) long.
The flowers grow from a clublike, somewhat square, whirled cluster; immediately below this club are a pair of stalkless leaves standing out on either side like a collar. Flowers are two lipped and tubular. The top lip is a purple hood, and the bottom lip is often white; it has three lobes with the middle lobe being larger and fringed upwardly. Flowers bloom at different times depending on climate and other conditions, but mostly in summer (from June to August in the USA).
Self-heal propagates both by seed and vegetatively by creeping stems that root at the nodes.
Range and habitat
Heal-all is a perennial herb found throughout Europe, Asia and North America, as well as most temperate climates. Its origin seems to be European, though it has been documented in other countries since before any history of travel. In the Republic of Ireland it is currently abundant in the west in the counties Galway and Clare, the southwest in Kerry, the south coast, and is also found around the central basin of Ireland. It is often found growing in moist areas, waste ground, grassland, woodland edges, and usually in basic and neutral soils.
Heal-all is edible, and can be used in salads, soups, stews, and boiled as a pot herb. The Cherokee cooked and ate the young leaves. The Nlaka'pamux drank a cold infusion of the whole plant as a common beverage. The plant contains vitamins A, C, and K, as well as flavonoids and rutin.
Self-heal is taken internally as a medicinal tea for sore throat, fevers, wounds, diarrhoea, internal bleeding, and weaknesses of the liver and heart. It was considered by the Chinese to "change the course of a chronic disease". In the traditional Austrian medicine Prunella vulgaris herb has been used internally as tea for treatment of disorders of the respiratory tract and infections.
The plant's active chemical constituents are betulinic acid, D-camphor, D-fenchone, cyanidin, delphinidin, hyperoside, manganese, lauric acid, oleanolic acid, rosmarinic acid, myristic acid, rutin, linoleic acid, ursolic acid, beta-sitosterol, lupeol, and tannins.
In vitro studies have shown it to have an antibacterial action, inhibiting the growth of pseudomonas, Bacillus typhi, E. coli, Mycobacterium tuberculi. It is also showing promise in research for AIDS, and allergies.
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- Other names include Lance Selfheal, Aleutian selfheal, Heal-all, Carpenter weed, Heart-of-the-earth, Blue Curls (generically) and Hook Heal. In Germany it is known as Kleine Braunelle; In Finland it is called Niittyhumala, and in Poland it is Glowienka pospolita.
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