Many donors have contributed materials and funds to the OPGC. Their contributions are gratefully acknowledged.
| Marilyn Barlow | Paul Cover | Ron Kinser |
| Tony Pinto | Natalie Stoughton | Bob Terwillegar |
| Mike Valentine |
Steve Banovetz |
Bill Claybaugh, American Begonia Society |
|
Mary Lou Gripshover Joseph Hamm Gerard Knehans, Jr American Daffodil Society |
Arnold Arboretum | Baker's Acres Greenhouses |
|
Peggy Campbell Botanical Interests |
Brian Corr Ball Horticultural |
James Ault Chicago Botanic Garden |
|
Jim Bissell Cleveland Museum of Natural History |
Niles Riese |
Scott Peak Hamilton County Park District |
|
Derick Pittman |
Greg Houseal Native Roadside Vegetative Center |
Alice Traut Native Seeds/SEARCH |
| Netherland Bulb Company | Northa Ameican China Plant Exploration Consortium |
Jeff Norcini North Florida Research and Education Center |
| Ohio Department of Natural Resources | Ohio Prairie Association | Michael Swintosky |
| Russell Eckley | Fred Higginbotham III | The Ohio State University Herbarium |
| Shawn Krosnick |
Richard Craig Penn State University |
Tony Avent Plant Delights Nursery |
|
Frank Porter Porterbrook Native Plants |
Justin Marotta Possum Run Greenhouses |
Rick & Beth Johnston Seedsower Farm |
|
Charles Heidgen Shady Hill Gardens |
St. Andrews Botanic Garden |
Don Beam Stucker Meadows |
|
Jim Adams The Herb Society of America |
Brian Parsons The Holden Arboretum |
Gary Hayes The Nature Conservancy - Kitty Todd Nature Preserve |
|
Bob Hawes The Wilderness Center |
Nicole Cavender The Wilds |
Michelle Grigore Toledo Botanical Garden |
|
Terry Zinn Wester Native Seed Wildflowers of Florida |
Brigid E. Bohl | Mary Ritter Garden Club |
| The Garden Club of Clifton | Jim Harper | Dosatron |
| Express Seed | Green Care | Harold L. Lyon Arboretum |
| Raymond Baker | Clifford Morden | Scotts Company |
|
Ron Determann Atlanta Botanical Garden |
Jim Rogers Nearly Native Nursery |