Garden Associations
- American Association of Botanical Gardens & Arboreta
- American Bamboo Society
- American Bonsai Society
- American Conifer Society
- American Daffodil Society
- American Fern Society
- American Primrose Society
- Association for Women in Horticulture
- The Canadian Rose Society
- East York Garden Club
- The Garden Club
- Holly Society of America
- International Clematis Society
- International Lilac Society
- The North American Rock Garden Society
- Ontario Horticulture Association
- The Royal Horticultural Society
- The Swedish Hoya Society
- World Iris Association
