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Username Password Keep me logged in Welcome to the American Horticultural Therapy Association Established in 1973 the American Horticultural Therapy Association AHTA is the only national US organization advocating for the development of the horticultural therapy profession and the practice of horticulture as therapy for human wellbeing. AHTA supports the professional development education and expertise of horticultural therapy practitioners. Individuals and organizations located across the US and beyond are members. We are a 501c3 nonprofit membershipdriven organization with the mission to promote and advance the profession of horticultural therapy as a therapeutic and rehabilitative modality.