Pest plant ACT. Weed of cool temperate regions.
http://www.environment.gov.au/cgi-bin/biodiversity/invasive/weeds/weeddetails.pl?taxon_id=18365
Carduus pycnocephalus is listed in the following regions:
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Bruce Ridge Bullen Range Commonwealth & Kings Parks Dananbilla Nature Reserve Gigerline Nature Reserve Gungahlin Pond Isaacs Ridge Isaacs Ridge and Nearby Mount Ainslie to Black Mountain Mount Majura Mount Mugga Mugga Swamp Creek Uriarra TSRPlaces
Canberra, ACT Coree, ACT Jerrabomberra, ACT Majura, ACT Murringo, NSW Nicholls, ACT O'Connor, ACT Stromlo, ACT Tuggeranong DC, ACT Tuggeranong, ACT