Pennsylvania Giant Pumpkin Grower's Association
- Devoted to growing the Atlantic giant pumpkin, with patch updates, pumpkin links, oddities, contests, and awards.
- http://www.pgpga.com/

The Valley Forge Chapter of the American Rhododendron Society
- Aims to stimulate local interest in rhododendrons and azaleas by sharing local, regional, and national knowledge via meeting and presentations, plant and book sales, flower shows, and publications.
- http://kemporama.com/vfars/

Down to Earth Garden Club
- DuBois group offers event schedule, advice from a Master Gardener, articles on gardening, chat room and newsletter.
- http://www.downtoearthgardenclub.com/

The Garden Club Federation of Pennsylvania
- This site provides our organizational setup, membership in local clubs, educational opportunities for members and the public, youth clubs and contests, scholarships offered annually and links to related horticultural sites.
- http://www.pagardenclubs.org

The Pennsylvania Horticultural Society
- The Society provides a place where all greening enthusiasts can pursue their own particular horticultural interests. Founded in 1827.
- http://www.pennsylvaniahorticulturalsociety.org/