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Weed Seed: Setaria faberi (Giant foxtail)



Common Name

Giant foxtail


Primary Noxious, Class 2 in the Canadian Weed Seeds Order, 2016 under the Seeds Act.


Canadian: Occurs in ON and QC (Brouillet et al. 2016Footnote 1).

Worldwide: Native to temperate eastern Asia and introduced in North America, central Europe, Russia and the Middle East (Nurse et al. 2009Footnote 2, USDA-ARS 2016Footnote 3). In the United States, it occurs mostly in the east and is expanding westward (Nurse et al. 2009Footnote 2).

Duration of life cycle


Seed or fruit type


Identification features



Surface Texture


Other Features

Habitat and Crop Association

Cultivated fields, old fields, gardens, roadsides, railway lines and disturbed areas (Darbyshire 2003Footnote 4). A weed of a variety of crops, but causes the greatest losses in corn and soybeans (Nurse et al. 2009Footnote 2, CABI 2016Footnote 5).

General Information

Giant foxtail may have been introduced into North America as a contaminant of imported millet. It may also contaminate bird seed and flower seed mixtures as well as other crop seeds. In Canada, the occurrence of giant foxtail coincided with the cultivation of field corn beginning in the 1960s (Nurse 2009Footnote 2).

Similar species

Yellow foxtail (Setaria pumila subsp. pumila)


Giant foxtail (Setaria faberi) spikelet and florets
Giant foxtail (Setaria faberi) spikelet
Giant foxtail (Setaria faberi) floret, lemma view
Giant foxtail (Setaria faberi) floret, side view
Giant foxtail (Setaria faberi) floret, palea view
Giant foxtail (Setaria faberi) spikelets

Similar species

Similar species: Yellow foxtail (Setaria pumila subsp. pumila) spikelet
Similar species: Yellow foxtail (Setaria pumila subsp. pumila) floret, palea view
Similar species: Yellow foxtail (Setaria pumila subsp. pumila) floret, lemma view
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