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Landscape Design Trust
Promotes quality of landscape through education and campaigning. Aims to influence and educate those who plan, design, build, maintain, manage and use the outdoor environment.
http://www.landscape.co.uk/ -
Horticultural Therapy Institute (HTI)
Provides education and training in horticultural therapy to those new to, or experienced with, the practice of using gardening and plants to improve the lives of others.
http://www.htinstitute.org/ -
I Love Gardens
Offers descriptive listings of over 1700 gardens and arboretums to visit in the US.
http://www.ilovegardens.com/