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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AARON POLY 1 Aranda Bushland Australian National University City Renewal Authority Area Commonwealth & Kings Parks Goulburn Wetlands Griffith Woodland Haig Park Hughes Garran Woodland Isaacs Ridge and Nearby Isaacs Ridge Offset Area Lake Burley Griffin West Mongarlowe River Mount Ainslie to Black Mountain Mount Mugga Mugga Point Hut Pond QPRC LGA Red Hill to Yarralumla Creek Stirling Park Sullivans Creek, Turner Tuggeranong Hill Wadbilliga National ParkSurvey points
Pollinator-friendly garden ConderPlaces
Acton, ACT Boorowa, NSW Bungendore, NSW Canberra, ACT Carwoola, NSW Conder, ACT Countegany, NSW Fadden, ACT Gordon, ACT Goulburn, NSW Griffith, ACT Hughes, ACT Jerrabomberra, ACT Molonglo Valley, ACT Mongarlowe, NSW Northangera, NSW O'Malley, ACT Phillip, ACT Tuggeranong DC, ACT Turner, ACT Wamboin, NSW Yarralumla, ACT