Belvedere House Park and Gardens
belvedere-house.ie
A visitor attraction with visitor centre, shop and restaurant. Visitor information, events, function rooms.
Southern Garden History Society
southerngardenhistory.org
Organization dedicated to the preservation and restoration of historic Southern U.S. gardens, and education about Southern landscape history. Information about membership, events, and publications.
California Garden & Landscape History Society
cglhs.org
Background, activities and membership.
Biltmore Garden Tour
biltmore.com
Forests and gardens, designed by landscape architect, Frederick Law Olmsted.
Museum of Garden History
cix.co.uk
A few details of the Trust and a contact email.