- Botanic Gardens Conservation International (BGCI)
- Links over 800 botanic gardens and botanical institutions in more than 120 countries in a worldwide network for plant conservation, environmental education and sustainable development.
- Bromeliad Society International
- Provides a list of group publications, membership information, and a list of member services.
- The Brown Lawn Society
- Advocates for sustainable gardening and natural plant propagation. Campaigns for environmentalism among all.
- Hebe Society
- Site of an organization that promotes the cultivation and conservation of hebes and other native New Zealand plants. With a plant list and links to other pages of interest.
- International Bulb Society
- Offers the society's history, book reviews, membership information, and members only areas.
- International Carnivorous Plant Society
- Features news, online journals, conservation information, and resources.
- The Mediterranean Garden Society
- Serves as an international forum for the furthering of gardening knowledge and the appreciation of plants and gardens fit for the mediterranean climate.
- New Ornamentals Society
- Introduces a group of professional horticulturalists, taxonomists, students, and landscape designers who are into discovering new ornamental landscape plants.
- Passiflora Society International
- Avenue for Passiflora enthusiasts to share information and get advice regarding plant identification.
- Professional Gardener's Guild
- Provides membership information, job postings, links, and an online diary.
- Royal Horticultural Society
- Contains gardening news, an online shop for gardening tools and supplies, and information on garden plants and designs.
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