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   Cirsium arvense (herb)
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    Details of this species in Alberta
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Established
    Source: Zouhar, 2001
    Arrival Date:
    Introduction: Unintentional (accidentally)
    Species Notes for this Location:
    Probably introduced to North America in the 1600s as a contaminant of crop seed and/or ship's ballast.
    Management Notes for this Location:
    According to Nuzzo (1997), in Alberta, Canada, spring burning in a marsh favored growth of native species and did not alter C. arvense biomass. An August fire increased biomass and shoot density of the weed, which averaged 63 g/sq-m vs. 5 g/sq-m, and 20 shoots/sq-m vs. 0.9 shoots/sq-m, on burned and unburned plots, respectively. Seedling density also increased following the summer fire. In another wetland in Alberta, Canada, C. arvense cover was not affected by fire, but increased when the wetland area was subjected to drought.
    Location Notes:
    Last Modified: 15/02/2004 4:08:14 p.m.

ISSG Landcare Research NBII IUCN University of Auckland