American Horticultural Therapy Association - "Offers information, professional registration and training programs."

Canadian Horticultural Therapy Association - "Assisting with program development, research, and to promote the professional use of horticulture as a therapy."

Garden Forever - "A gardening web magazine for gardeners of all ages, abilities and lifestyles."

Garden Partners - "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."

Gardening with AD/HD - Gardening techniques that work well for the inattentive gardener. Specific plants and techniques.

hort - City Farmer

Horticultural Therapy Association of Victoria - "HTAV fosters and supports horticultural programs and activities which enhance in a meaningful way, the social, emotional and physical well-being of people both in their homes and in a variety of community settings."

Human Issues in Horticulture - "List of sites which include gardening with the elderly, with children, and horticulture therapy."

Josh's Garden Web - "Handicap Accessible Gardening, article by Josh Spece."

Michigan Horticultural Therapy Association - MHTA strives to promote the use of horticulture as therapy throughout the state of Michigan.

Red Wiggler Community Farm - Founded in 1996 as a non-profit horticulture therapy and vocational training program for adults with developmental disabilities.

Susan Tomlin's Disabled Gardening Page - Susan's page is an inspirational site about gardening with a physical disability.

The Growing Center Inc. - "A non-profit horticultural therapy center in Frederick, PA. Community gardens, a monthly meeting for local people and information about horticultural therapy."

Thrive - "UK national horticultural charity that promotes the use of gardening and horticulture for training and employment, therapy and health."