Pest plant ACT. Weed of cool temperate regions.
http://www.environment.gov.au/cgi-bin/biodiversity/invasive/weeds/weeddetails.pl?taxon_id=11753
Carduus tenuiflorus is listed in the following regions:
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ANBG Caladenia Forest, O'Connor Coornartha Nature Reserve Crace Grasslands Farrer Ridge Gigerline Nature Reserve Isaacs Ridge Isaacs Ridge and Nearby Mount Mugga Mugga Mount Painter Tidbinbilla Nature Reserve Wanniassa HillPlaces
Acton, ACT Aranda, ACT Dairymans Plains, NSW Garran, ACT Glen Fergus, NSW Isaacs, ACT Jerrabomberra, ACT Jones Creek, NSW Mitchell, ACT Molonglo Valley, ACT O'Malley, ACT Paddys River, ACT Symonston, ACT Tennent, ACT