There are many amateur gardening organisations across Australia that represent the garden industries.
Some of those include:
Garden Clubs of Australia www.gardenclubs.org.au
Royal Horticultural Society of Victoria www.rhsv.org.au
Australian Association of Friends of Botanic Gardens www.friendsbotanicgardens.org
Australian Native Plants Society anpsa.org.au
If your organisation is not listed here and you would like to be; please apply to be listed in an email (send to: firstname.lastname@example.org)