Weed Seed: Sisymbrium loeselii (Tall hedge mustard)
Tall hedge mustard
Secondary Noxious, Class 3 in the Canadian Weed Seeds Order, 2016 under the Seeds Act.
Canadian: Occurs in AB, BC, MB, NB, NT, ON, QC, SK (Brouillet et al. 2016Footnote 1).
Worldwide: Native to eastern Europe and temperate Asia and introduced in North America, western and northern Europe and Japan (USDA-ARS 2016Footnote 2). In the United States, found in many states except for some in the south (USDA-NRCS 2016Footnote 3).
Duration of life cycle
Annual or Winter annual
Seed or fruit type
- Seed length: 0.8 - 1.3 mm
- Seed width: 0.5 - 0.8 mm
- Seed thickness: 0.5 mm
- Oblong-shaped seed, with rounded or truncate ends
- Seed glossy, slightly wrinkled
- Seed yellowish; dark orange at the hilum end
- Radicle often extends past end of seed
- Distinct furrow can be seen between radicle and cotyledons
Habitat and Crop Association
Cultivated fields, old fields, field margins, pastures, stream banks, vacant lots, roadsides, railway lines and disturbed areas (Frankton and Mulligan 1993Footnote 4, FNA 1993+Footnote 5, Darbyshire 2003Footnote 6).
Tall hedge mustard's ability to produce chemicals capable of inhibiting germination and growth of nearby plants gives it a competitive edge in rangelands (Bainard et al. 2009Footnote 7).
Tumble mustard (Sisymbrium altissimum)
- Tumble mustard seeds are similar in size, oblong shape, wrinkled surface and the distinct furrow between the radicle and the cotyledons.
- Tumble mustard seeds have a rough rather than a glossy surface. The radicle is at level with the end of the seed, and they are a reddish-brown colour when compared to tall hedge mustard.
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