Note that at higher altitudes, this could be the native dandelion, Taraxacum aristum.
Environmental weed in NSW and Vic (as Taraxacum officinale).
http://keyserver.lucidcentral.org/weeds/data/media/Html/taraxacum_officinale.htm
Taraxacum sp. is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | Albury, Wodonga | South Coast
Synonyms
Taraxacum officinaleReceive alerts of new sightings
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ANU Daley Precinct Aranda Bushland Australian National University Bournda National Park City Renewal Authority Area Commonwealth & Kings Parks David Winterbottom Park Eurobodalla National Park Goulburn Mulwaree Council Goulburn Wetlands Griffith Woodland Haig Park Hughes Garran Woodland Isaacs Ridge and Nearby Isaacs Ridge Offset Area Lake Burley Griffin West Mittagong Mongarlowe River Morton National Park Mount Ainslie to Black Mountain Mount Mugga Mugga Point Hut Pond Red Hill Nature Reserve Red Hill to Yarralumla Creek Stirling Park Sullivans Creek, Turner Tuggeranong Hill Wadbilliga National Park Wingecarribee Local Government Area WodongaPlaces
Red Hill, ACT