Weed Seed: Datura stramonium (Jimsonweed)
Canadian: Occurs in AB, BC, MB, NB, NS, ON, PE, QC, SK (Brouillet et al. 2016Footnote 1).
Duration of life cycle
Seed or fruit type
- Seed length: 2.5 - 4.0 mm
- Seed width: 2.5 - 3.0 mm
- Rounded D-shaped seed, compressed, hilum is along the narrow edge
- Seed dull, pitted surface with wrinkles
- Seed dull black to brown; immature seeds are lighter
- The hilum is triangular, 1.0 mm long and filled with white to pinkish tissue
- There is a small bump at the bottom of the hilum
Habitat and Crop Association
Cultivated fields, row crops, old fields, gardens, farmyards, fencelines, shores, roads and disturbed areas (Royer and Dickinson 1999Footnote 4, Darbyshire 2003Footnote 5). A weed of soybeans, beans, corn, tobacco, tomatoes and sweet peppers in the midwestern United States and southern Ontario and Quebec (Weaver and Warwick 1984Footnote 6).
Jimsonweed is an aggressive colonizer of agricultural fields in almost any summer crop. Plants may produce 1,300-30,000 seeds, and these may survive up to 39 years in the soil (CABI 2016Footnote 3). Poisonous to livestock and humans (Royer and Dickinson 1999Footnote 4).
Buffalo bur (Solanum rostratum)
- The seeds are a similar rounded D-shape, pitted surface, compressed and black colour as jimsonweed.
- Buffalo bur seeds (length: 2.5 - 3.3 mm; width: 2.3 - 2.5 mm) are generally smaller than jimsonweed, have a deeply pitted surface, wavy edges, and an open hilum.
Large thorn apple (Datura ferox)
- The seeds of large thorn apple are the same rounded D-shape, size, black colour and dull, pitted and wrinkled surface as jimsonweed.
- The hilum of large thorn apple is oval with rounded edges, not triangular with straight edges as jimsonweed. There is also a notch next to the hilum, rather than a bump as in jimsonweed.
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