The open plant encyclopedia
Snap a photo or search by any name to see how to care for it, where it comes from, whether it's safe, and a 3D model you can turn.
The plants people record most in your country, and ones that grow there wild.
Filter by what you want to do, shape, origin, country, care and safety.
Erigeron canadensis
Also called Butterweed, Canada Fleabane, Canada Horseweed, Canadian Horseweed, Cronquist, Foxtail, Hogweed
Canadian fleabane is a common annual weed of the daisy family, native across North and Central America and widely naturalized elsewhere. It is grown mainly as a weed rather than a garden plant, and it spreads easily from seed in disturbed ground.
Erigeron canadensis (synonym Conyza canadensis) is an annual plant native throughout most of North America and Central America. It is also widely naturalized in Eurasia and Australia. Common names include horseweed, Canadian horseweed, Canadian fleabane, coltstail, marestail, and butterweed. It was the first weed to have developed glyphosate resistance, reported in 2001 from Delaware.
Horseweed originated in North America and Central America and is widespread in its native range. It has spread to inhabited areas of most of the temperate zone of Asia, Europe, and Australia. It is found in Britain from northern Scotland to Cornwall, growing as a weed of arable land and man-made environments. It is considered invasive in China.
The Zuni people insert the crushed flowers of E. canadensis var. canadensis into the nostrils to cause sneezing, relieving rhinitis. The Seminole people used it for cold and cough medicine, the Iroquois people used it to help combat fevers, and the Navajo and Chippewa peoples used it for stomach pain. Other medicinal applications include use as a nervine, stimulant, and antiplasmodic (anti-parasitic specific to a genus of plasmids - malaria is one) .
Dwarf horseweed · Eastern daisy fleabane · Alpine yellow fleabane · Latin American fleabane · Philadelphia fleabane · Guernsey Fleabane · Fleabane
Text excerpted from the Wikipedia article Erigeron canadensis by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
