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 | Greater Sydney | Gippsland
Synonyms
Taraxacum officinaleMaps
ANU Daley Precinct Aranda Bushland Australian National University City Renewal Authority Area Commonwealth & Kings Parks Genoplesium vernale target area Goulburn Mulwaree Council Goulburn Wetlands Griffith Woodland Haig Park Hughes Garran Woodland Isaacs Ridge and Nearby Isaacs Ridge Offset Area Lake Burley Griffin West MichaelBedingfied's Home Garden Mongarlowe River 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 ParkPlaces
Red Hill, ACT