| Auburn Horticultural Society, Auburn Memorial Hall | Central Huron |
| Barrie Garden Club | Barrie |
| Bayfield Garden Club | Bluewater |
| Brighton Garden Club | Brighton (Municipality of) |
| Brussels & District Horticultural Society | Huron East |
| Cobourg Garden Club | Cobourg |
| Goderich & District Horticultural Society | Goderich |
| Goderich Communities in Bloom | Goderich |
| Hensall Horticultural Society, Mailing Address | Bluewater |
| Huronia Rose Society | Barrie |
| Kirkton Horticultural Society, Kirkton-Woodham Community Centre | West Perth |
| Norland Horticultural Society | Norland |
| Orangeville & District Horticultural Society | Orangeville |
| Oro-Medonte Horticultural Society | Oro-Medonte |
| Painswick Garden Club | Barrie |
| Peterborough Horticultural Society | Peterborough |
| Seaforth & District Horticultural Society | Huron East |
| St Marys Horticultural Society, St Marys Legion Hall | St Marys |
| Stratford & District Horticultural Society, GardenStratford | Stratford |
| Stratford and Area Master Gardeners, No Physical Address | Stratford |
| Wingham and District Horticultural Society | North Huron |