Canadian Horseweed,

THE WEEKLY WEED: Canadian Horseweed (Conyza canadensis)

Canadian horseweed (Conyza canadensis, family Asteraceae) has become notorious in recent years for failing to respond to glyphosate (e.g. Roundup) in agricultural fields and landscapes.  This annual weed, which is also known as just horseweed, Canadian fleabane, coltstail, and marestail, has moved in recent years from being a plague in field crops to become a scourge in landscapes and nurseries.  Indeed, this native North America plant has become such a problem in Ohio it has been added to the state's noxious weeds list.

 

Challenges with managing this weed centers...

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Authors
Joe Boggs