Environmental weed in Victoria. Sleeper weed elsewhere.
http://keyserver.lucidcentral.org/weeds/data/media/Html/mentha_x_piperita.htm
Mentha x piperita is listed in the following regions:
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City Renewal Authority Area Gigerline Nature Reserve Googong Foreshore Haig Park Jerrabomberra Wetlands Kosciuszko National Park Lake Burley Griffin West Mongarlowe River Mount Mugga Mugga Point Hut to Tharwa QPRC LGA Sullivans Creek, TurnerPlaces
Acton, ACT Burra, NSW Canberra Central, ACT Coree, ACT Fyshwick, ACT Hackett, ACT Jagungal Wilderness, NSW Nimmitabel, NSW O'Malley, ACT Paddys River, ACT Tennent, ACT Tuggeranong DC, ACT Turner, ACT Yarralumla, ACT