People Plant Council - To promote research and communication of the influence of plants on people.

Therapeutic Landscapes Network - Information about healing landscapes.

Human Dimensions of Urban Forestry and Urban Greening - Site prepared by Kathy L. Wolf at the University of Washington.  Links to a variety of short fact sheets suitable for printing.

Landscape and Human Health Laboratory - at the Univ. of Illinois at Urbana-Champaign, Frances E. Kuo, Director.  "The Landscape and Human Health Laboratory (LHHL) is a multidisciplinary research laboratory dedicated to studying the connection between greenery and human health."  This site has information on the study that examined domestic violence in housing units with and without surrounding trees. 

International Symposium on Human-Horticulture Relationships - Abstracts from papers presented at the XXV International Horticultural Congress in Belgium in 1998.  Papers presented overviews of activities in Asia, the South Pacific region, Europe, and the Americas.

International People-Plant Interaction Resource Center - The mission of this Council is to document and communicate the effect that plants have on human well-being and improved life quality, focusing on the psychological, sociological, physiological, economic, and environmental effects of plants on people.  There are many links at this site.
 
Plants for People Organization - "Plants for People is an international initiative with the aim of informing about the feeling of well-being that plants create in the working environment."

Working Group on Human Issues in Horticulture - This site has out-of-date information about this working group of the American Society for Horticultural Science.

Wangari Maathai - 2004 Nobel Peace Prize winner who used tree planting to improve the lives of poor women in Africa.

American Horticultural Therapy Association