| Auburn Horticultural Society, Auburn Memorial Hall | Central Huron |
| Barrie. Municipal Office, Barrie - 165 Ferndale Dr N, Greenhouse | Barrie |
| Barrie. Municipal Office, Barrie - 45 Cedar Pointe Dr, Enforcement Services | Barrie |
| Bayfield Garden Club | Bluewater |
| Blue Mountain Watershed Trust Foundation | Collingwood |
| Bridgenorth Beautification Committee, Bridgenorth - Mailing Address | Selwyn Township |
| Brussels & District Horticultural Society | Huron East |
| CBEAC - Civic Beautification and Environmental Awareness Committee, No Physical Address | Stratford |
| Friends of Presqu'ile Park | Brighton (Municipality of) |
| Hensall Horticultural Society, Mailing Address | Bluewater |
| Ontario Nature | Toronto Downtown |
| Ontario. Ministry of Environment, Conservation and Parks, Owen Sound Field Office | Owen Sound |
| Orillia Naturalists Club | Orillia |
| Stratford & District Horticultural Society | Stratford |
| Upper Avon River Conservation Club | Perth East |