Master Gardener Program - UNH Cooperative Extension
- Network of trained volunteers who share their knowledge and experience with the public in the areas of vegetable and fruit growing, lawn and tree care, flowers, soil improvement, and organic practices.
- http://extension.unh.edu/Agric/AGMastGD.htm

New Hampshire Giant Pumpkin Growers Association
- Membership information, discussion forum, growing hints,photo gallery, and event listings.
- http://www.nhgpga.org/

New Hampshire Orchid Society
- For orchid enthusiasts from hobbyist to grower. Membership information, event listings, newsletters, and officers.
- http://www.nhorchids.org/

New Hampshire Federation of Garden Clubs
- Coordinates the interests of local garden clubs, and works with other groups on conservation and beautification projects.
- http://www.nhfgc.org/