Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
Alberta Invasive Plant Identification Guide
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Thistle, Canada<br />
Cirsium arvense, Asteraceae (Sunflower Family)<br />
Category: Noxious<br />
Sarah Schumacher, Wheatland County<br />
• Information: Introduced from Europe. Found across most of <strong>Alberta</strong>.<br />
• Life cycle: Aggressive creeping perennial.<br />
• Root: Horizontal and vertical (rhizomatous).<br />
• Leaves: Alternate, wavy, lance shaped, lobed, spine-tipped and lack<br />
stalks; Upper leaves smaller than lower leaves.<br />
• Stems: 30-120cm tall, lack spines, erect, ridged, branched, and slightly<br />
hairy.<br />
• Flower: Purple, pink or white with diameter of 1.5-2cm form clusters at<br />
branch ends. Bracts have weak prickles (no spines). Have male and female<br />
flowers. Have a sweet smell when in bloom.<br />
• Seed/Fruit: Long, flattened seeds with tufts of white hairs.<br />
• Control: Chemical, late fall application.<br />
74<br />
AIPC Fact sheet http://www.invasiveplants.ab.ca/Downloads/FS-CanadaThistle.pdf<br />
Sarah Schumacher, Wheatland County<br />
Sarah Schumacher, Wheatland County<br />
Sarah Schumacher, Wheatland County Sarah Schumacher, Wheatland County
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