Canadian Fleabane plant - Conyza Canadensis syn. Erigeron Canadensis (Asteraceae)

Medicinal Use of Canadian Fleabane – Conyza Canadensis syn. Erigeron Canadensis (Asteraceae)


Erect annual herb growing to 3 ft (1 m). Has narrow, dark green, lance-shaped leaves and clusters of small white flower heads that quickly fade into silky white tufts.

Habitat & Cultivation

Native to North America, Canadian fleabane is now common in South America and Europe. It thrives on uncultivated and recently cleared land, often invading in large swaths. It is gathered from the wild when in flower.

Parts Used

Aerial parts.


Canadian fleabane contains a volatile oil (including limonene, terpineol, and linalool), flavonoids, terpenes, plant acids, and tannins.

History & Folklore

In traditional North American herbal medicine, Canadian fleabane was boiled to make steam for sweat lodges, taken as a snuff to stimulate sneezing during the course of a cold, and burned to create a smoke that warded off insects–hence its common name.

Medicinal Actions & Uses

An astringent herb, Canadian fleabane is taken for gastrointestinal problems such as diarrhea and dysentery. A decoction of Canadian fleabane is reportedly a very effective treatment for bleeding hemorrhoids. The herb is occasionally used as a diuretic for bladder problems, to clear toxins in rheumatic conditions, and to treat gonorrhea and other genitourinary diseases.

Related Species

The Philadelphia fleabane (E. philadelphicus) was used by the Houma as a treatment for menstrual problems. E. affinis, a Mexican relative, is used to make a tooth powder and to treat toothache.