IPMP3.0, Oregon State University, Copyright 2000

Compositae (Conyza canadensis)


Biology and Management

Registered Herbicides

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Horseweed Seeling (link to large image)

Horseweed (link to large image)

Horseweed Seedling Horseweed

Horseweed Mature Plant (link to large image)

Horseweed is an annual. Young plants form rosette with softly toothed and hairy leaves. Mature plants produce a 2- to 5-foot stem that is terminally branched. Numerous small white or pink flowers produced on stem branches.

Horseweed Mature Plant


This section contains information on identification of the different life stages of Horseweed.  Select Biology and Management from the Contents Menu for more information on the biology and management, or select Registered Herbicides for the herbicides that are registered to control this weed in mint.