Garden Partners
- http://www.gardenpartners.org/
- An organization in Portland, Oregon. Its mission is to enhance the physical, mental, social, and spiritual well-being of individuals through participation in meaningful garden-related activity.
The Growing Center Inc.
- http://www.growingcenter.org/
- A non-profit horticultural therapy center in Frederick, PA. Community gardens, a monthly meeting for local people and information about horticultural therapy.
Thrive
- http://www.thrive.org.uk/
- UK national horticultural charity that promotes the use of gardening and horticulture for training and employment, therapy and health.