Native Plants
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Conyza canadensis
Conyza canadensis (L.) Cronquist
Horseweed, Canadian Horseweed
Asteraceae (Aster Family)
Synonym(s):
USDA Symbol: COCA5
USDA Native Status: L48 (N), AK (I), HI (I), PR (N), VI (N), CAN (N), SPM (N)
A coarse weed with erect bristly-haired stem that has branching clusters of small, cup-like, greenish-white flower heads arising from upper leaf axils. The minute white rays do not spread and thus are not showy; the numerous disk flowers are yellow.
An annual that thrives on bare soil, Horseweed is soon crowded out as perennials become established. Originally a North American plant, it has spread to Europe, where it colonizes open disturbed sites. Indians and early settlers used a preparation of its leaves to treat dysentery and sore throat.
Bloom Information
Bloom Color: WhiteBloom Time: Jul , Aug , Sep , Oct , Nov
Distribution
USA: AL , AR , AZ , CA , CO , CT , DC , DE , FL , GA , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WYCanada: AB , BC , MB , NB , NL , NS , NT , ON , PE , QC , SK
Native Distribution: Throughout North America, except parts of far north.
Native Habitat: Fields, roadsides, and waste places.
Growing Conditions
Water Use: MediumLight Requirement: Sun
CaCO3 Tolerance: Low
Benefit
Conspicuous Flowers: yesFrom the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:Pineywoods Native Plant Center - Nacogdoches, TX
Sibley Nature Center - Midland, TX
Brackenridge Field Laboratory - Austin, TX
Stengl Biological Research Station - Smithville, TX
Wildflower Center Seed Bank
LBJWC-0148 Collected 2007-09-04 in Travis County by Lady Bird Johnson Wildflower CenterAdditional resources
USDA: Find Conyza canadensis in USDA PlantsFNA: Find Conyza canadensis in the Flora of North America (if available)
Google: Search Google for Conyza canadensis
Metadata
Record Modified: 2016-07-14Research By: TWC Staff