Douglas County Conservation District
SERVING LANDOWNERS IN DOUGLAS COUNTY COLORADO FOR OVER 56 YEARS
PO BOX 688, 7519A E HWY 86, FRANKTOWN, CO 80116 303-218-2622
Canada Thistle
Cirsium arvense
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Differs from other species of the true thistle in that there are male and female flower heads, and these are on separate plants. By asexual reproduction, it is possible that a colony of male plants would produce no fruits, but still maintain itself. Flowering occurs during July and August.