1989 Brooklyn Botanic Garden's Children's Garden
1990 Arboretum School of the Barnes Foundation
1991 University of British Columbia Botanical Garden, Plant Introduction Scheme
1992 The North Carolina State Arboretum, Plant Research, Evaluation and Introduction
1993 Minnesota Landscape Arboretum, Youth Education Program
1994 North Carolina Zoological Park, Sonoran Desert Collection
1995 Nebraska Statewide Arboretum, Community Landscape Improvement Program
1995 The National Tropical Botanical Garden, Growing Seed: The Wiliwili Project
1996 The Holden Arboretum, Conservation Program
1996 Santa Barbara Botanic Garden, Plant Scholars Program
1997 Harold L. Lyon Arboretum, Micropropagation of Endangered Hawaiian Plants
1998 Midwest Public Gardens Collaborative: Chicago Botanic Garden; The Holden Arboretum; Minnesota Landscape Arboretum; Missouri Botanical Garden; The Morton Arboretum
1999 Minnesota Landscape Arboretum's Andersen Horticultural Library
2000 EARTH University
2001 Dallas Arboretum & Botanical Garden
2002 Marie Selby Botanical Garden
2003 Brooklyn Botanic Garden
2004 Atlanta Botanical Garden
2004 North Carolina Botanical Garden
2005 New England Wildflower Society
2006 Albuquerque Biological Parks
2006 Rio Grande Botanical Garden
2007 Nebraska Statewide Arboretum
2008 Chicago Botanic Garden
2008 Missouri Botanical Garden
2009 Queens Botanical Garden
2010 The Sustainable Sites Initiative
2011 Longwood Gardens, Professional Gardener Training Program
2012 Smithsonian Institution: The Archives of American Gardens (AAG)
2013 The Georgia Plant Conservation Alliance, State Botanical Gardens of Georgia
2014 The Fairchild Challenge, Fairchild Tropical Botanic Garden
2015 – Small Garden: The Water Conservation Garden, Ms. Smarty-PlantsLarge Garden: Chicago Botanic Garden, Science Career Continuum
2016 – Small Budget: Jardin Botanico De Cicieana; Large BudgetUnited States Botanic Garden and Lady Bird Johnson Wildflower Center, Landscape for Life
2017Small Budget: The Hands-on-Nature Anarchy Zone at Ithaca Children’s Garden; Large Budget: The Chanticleer Scholarship in Professional Development
2018North Carolina Botanical Garden, "Wonder Connection"; Portland Japanese Garden, Japanese Garden Training Center
2019 – 
Children at Play Network, Bernheim Arboretum and Research ForestEpiphytes of Belize, Marie Selby Botanical Garden
2020 – Windy City Harvest, Chicago Botanic Garden; Bringing Books to Life, Myriad Botanical Garden