Australia
- Australia ICOMOS
- Australian Institute of Landscape Architects
- Australian Landscape Conference
- Australian Plants Society SA
- Avenues of Honour
- Botanic Gardens Australia and New Zealand (BGANZ)
- Australian Association of Friends of Botanic Gardens
- The Garden Clubs of Australia
- Garden Plant Conservation Association of Australia (GPCAA)
- Heritage Roses In Australia
- Historic Houses Association of Australia
- The Historic Houses Trust - Colonial Plants Database
- The C J La Trobe Society
- National Library of Australia (Inc. Trove database)
- National Trust Australia
- Open Gardens Victoria
- Open Gardens SA
- Open Gardens Canberra
- Public Record Office Victoria
- Royal Australian Historical Society
- The Royal Horticultural Society of NSW Inc.
- Royal Horticultural Society of Victoria
- Sydney Living Museum
- TREENET
- Walter Burley Griffin Society
Government Departments
- ACT Environment and Sustainable Development - Heritage
- NSW Government- Culture and Heritage
- South Australian Department of Environment and Heritage
- Heritage Council of Western Australia
- Heritage Victoria
- Australian Heritage Council
- Australian Heritage Website
Public Gardens in Australia
- Australian National Botanic Gardens, ACT
- Botanic Gardens – South Australia
- Brisbane Botanic Gardens
- Bronte Estate, Sydney
- Centennial & Moore Parks, Sydney
- Kings Park, Western Australia
- Royal Botanic Gardens Victoria, Cranbourne
- Royal Botanic Gardens Victoria, Melbourne
- Royal Tasmanian Botanical Gardens
- Royal Botanic Gardens and Domain Trust, Sydney
- Parramatta Park, Sydney
International
- California Garden & Landscape History Society
- The Australasian Plant Pathology Society
- The Cultural Landscape Foundation
- The Garden Conservancy
- GardenVisit.com
- UK Garden History Society
- UK Garden Museum
- Historic Gardens Foundation
- ICOMOS - International Council of Monuments and Sites
- International Specialised Skills Institute (ISSInstitute)
- International Federation of Landscape Architects (IFLA)
- The Olmsted Conservancy
- The Royal Horticultural Society