Other Gardens Trusts
- Buckinghamshire Gardens Trust
- Cambridgeshire Gardens Trust
- Cheshire Gardens Trust
- Cornwall Gardens Trust
- Devon Gardens Trust
- Essex Gardens Trust
- Gloucestershire Gardens Trust
- Hampshire Gardens Trust
- Kent Gardens Trust
- Lincolnshire Gardens Trust
- London Gardens Trust
- Norfolk Gardens Trust
- Northamptonshire Gardens Trust
- Somerset Gardens Trust
- Staffordshire Gardens & Parks Trust
- Surrey Gardens Trust
- Sussex Gardens Trust
National Organisations
- British Trust for Conservation Volunteers (BTCV)
- East Anglian Garden Group
- English Heritage
- European Boxwood & Topiary Society
- Folly Fellowship
- The Garden Museum
- The Gardens Trust
- Georgian Group
- Henry Doubleday Research Association
- The Linnean Society
- Lutyens Trust
- National Gardens Scheme
- National Trust
- Plant Heritage
- Pulham Legacy
- Registered Parks and Gardens
- Royal Forestry Society
- Royal Horticultural Society
- Tree Register of the British Isles
- Twentieth Century Society
- Victorian Society
- Woodland Trust