Greater Brookland Garden Club
- Encourages residents to take action with public and private green spaces. Includes events, projects, photographs, membership information and tour brochures.
- http://www.gbgc.org/

National Capital Cactus and Succulent Society
- Works to educate and inform members. Includes activities and membership information.
- http://www.cactus-mall.com/clubs/nccss.html

National Capital Orchid Society
- Information on the club's activities, including its annual orchid show and orchid auction.
- http://www.ncos.us/

National Capital Area Federation of Garden Clubs
- Encompasses more than 100 garden clubs in the metropolitan area. Gardening information, calendar of events, and list of member clubs and affiliates.
- http://www.ncafgardenclubs.org/