Rock Garden Societies
- NARGS - North American Rock Garden Society National Site [Canada, USA]
- AGS - The Alpine Garden Society [UK]
- SRGC - Scottish Rock Garden Club [UK]
Plant Societies
- American Iris Society
- International Bulb Society
- Michigan Regional Lily Society
- American Hosta Society; Great Lakes Region
- American Rhododendron Society
- Wild Ones; Ann Arbor Chapter
- American Hemerocallis Society; Illinois, Indiana, Michigan, Ohio, Wisconsin Pages
- The Pacific Bulb Society
- The Fritillaria Group of the AGS
Plant Sources
- Arrowhead Alpines [Fowlerville, MI 48836]
- Wrightman Alpines [Kerwood, ON Canada N0M 2B0]; Harvey's Blog; Esther's Blog
- Gee Farms [ Stockbridge, MI 49285-9405]