- American Garden Archives of Smithsonian Institution
- American Horticultural Society
- American Public Gardens Association
- Garden Visit
- LandscapeLeadership.com
- LandscapeOnline
- Landscaping Network
- Museum of Garden History (UK)
- National Trust Open Days (UK)
- Royal Horticultural Society (UK)
- The Cultural Landscape Foundation
- The Garden Conservancy
- The Garden History Society (UK)
- ThinkinGardens
