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British Streptocarpus Society
- Caters for general and specialist growers of Cape Primroses; includes details of membership and services, growing advice, and photo galleries.
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Eckford Sweet Pea Society of Wem
- Organises an annual sweet pea show to celebrate the town's association with Henry Eckford, the hybridist and nurseryman who developed the modern variety in the 1890s.
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National Sweet Pea Society
- An association for growers of Lathyrus odoratus; includes details of membership, events, and advice for gardeners.
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National Viola and Pansy Society
- Offers plant profiles, exhibition standards, and details of their journals and newsletters.
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