Plants
- 501
- Saskelook Rose Garden
- Galleries of photos from Japanese gardens, sorted into Japanese, American, and European roses.
- 502
- The Old Lady of Old Roses
- Evaluations and photos of roses selected for disease resistance and vigor.
- 508
- No. CA-Nevada-Hawaii District
- California (zips 936xx-961xx), Hawaii, and Nevada (except Las Vegas)
- 509
- Pacific Northwest District
- Alaska, Idaho (zips 835xx-838xx), Montana (zips 594xx-599xx), Oregon, and Washington, and British Columbia, Canada
- 511
- Yankee District
- Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont, and Québec.
- 512
- International Palm Society
- Invites people worldwide to grow palm trees and learn about these important resources of food, fiber, oil, and beauty in the landscape.
- 513
- Palm Beach Palm and Cycad Society
- Chapter of the International Palm Society presents information about meetings, events, and membership, as well as a photo gallery.
- 514
- Palm Society of South Texas
- Promotes the use of palms in landscaping. Provides education on the cultivation and preservation of palms.
- 515
- The European Palm Society
- An organization dedicated to the sharing of information about palms and other exotic plants across the continent of Europe.
- 516
- The Milwaukee Rose Society
- Meeting information, calendar of events, rose show results, and rose photos.
- 517
- Seattle Rose Society
- Society information, rose care articles, events and activities, and a members-only section.