| Angus Horticultural Society | Essa |
| Apple Country Garden Club | Cramahe |
| Auburn Horticultural Society, Auburn Memorial Hall | Central Huron |
| Barrie Garden Club | Barrie |
| Bayfield Garden Club | Bluewater |
| Baysville Horticultural Society | Lake of Bays Township |
| Beeton Horticultural Society | New Tecumseth |
| Bond Head / Bradford Garden Club | Bradford West Gwillimbury |
| Brentwood Horticultural Society | Clearview (Simcoe County) |
| Brighton Garden Club | Brighton (Municipality of) |
| Brussels & District Horticultural Society | Huron East |
| Campbellford and District Horticultural Society | Trent Hills |
| Cobourg Horticultural Society | Cobourg |
| Collingwood Garden Club and Horticultural Society, Collingwood Horticultural Society | Collingwood |
| Creemore Horticultural Society | Clearview (Simcoe County) |
| Elmvale and District Horticultural Society, Elmvale-John St, Elmavale District Garden Enthusiasts | Springwater |
| Goderich & District Horticultural Society | Goderich |
| Goderich Communities in Bloom | Goderich |
| Grafton Green Thumbs | Grafton |
| Hensall Horticultural Society, Mailing Address | Bluewater |
| Huronia Rose Society | Barrie |
| Kirkton Horticultural Society, Kirkton-Woodham Community Centre | West Perth |
| Lakefield and District Horticultural Society | Lakefield |
| Midland Horticultural Society | Midland |
| Minden & District Horticultural Society | Minden Hills |
| Norland Horticultural Society | Norland |
| Omemee Blooms Garden Club, Omemee and District Horticultural Society | Kawartha Lakes |
| Orangeville & District Horticultural Society | Orangeville |
| Orillia Horticultural Society | Orillia |
| Oro-Medonte Horticultural Society | Oro-Medonte |
| Painswick Horticultural Society | Barrie |
| Penetanguishene Garden Club, Penetanguishene Memorial Arena, meetings only. | Penetanguishene |
| Peterborough and Area Master Gardeners, Peterborough - No Physical Location | Peterborough |
| Peterborough Horticultural Society | Peterborough |
| Port Hope Garden Club | Port Hope (Municipality of) |
| Ripley and District Horticultural Society | Huron-Kinloss |
| Seaforth & District Horticultural Society | Huron East |
| St Marys Horticultural Society, St Marys Legion Hall | St Marys |
| Stayner Horticultural Society | Clearview (Simcoe County) |
| Stratford & District Horticultural Society | Stratford |
| Stratford and Area Master Gardeners, No Physical Address | Stratford |
| Wasaga Beach Garden Club | Wasaga Beach |
| Wingham and District Horticultural Society | North Huron |
| Wye Marsh Wildflower Gardeners, Wye Marsh | Midland |