Ambrosia trifida (weed)

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Ambrosia trifida (click on image to enlarge it)
Author(s): G.T. Bacchus
Source: Wikimedia Commons

Ambrosia trifida (weed) L. - (giant ragweed)

Giant ragweed is an important weed of field crops in North America. Especially maize and soybean are affected. The weed is characterized by its early emergence, rapid growth rate and resistance to several herbicides. The pollen can also cause allergy. On the other hand, it is readily eaten by livestock. It grows well in disturbed, rich and wet soils.

The plants typically grow to a height of 1-2 m, but can reach several metres. It can be distinguished from related species like common ragweed (Ambrosia artemisiifolia) by its size, the shape of the leaves and inflorescences, as well as by the number of spines on the seeds or the structure of the pollen grains.

Vernacular names
• Deutsch: Dreilappiges Traubenkraut
• English: giant ragweed
• Español: artemisa grande
• Français: grande herbe à poux