Gardens in the UK
Discover Hampshire's Gardens - Useful resource from Hampshire County Council with links to detailed entries describing gardens, parks and plant collections.
English Nature - National Nature Reserves Database - Search for information by area or by habitat.
Essential British Gardens - Digest of some of the finest gardens and arboretums in Britain based on the experiences of the author and other keen gardening friends; includes about 280 links to many of the gardens.
Gardening UK's Gardening Events and Open Gardens - County by county listing of gardening events and gardens open to the public in the UK (and elsewhere!).
Historic parks and gardens of Wales - Guide to locations, features and opening times.
iGarden - Gardens to Visit in Southern England - Useful, print-able listing of gardens to visit in the Southern counties.
Topiary Art - Galleries and tours of historic English castles and topiary gardens, library and online topiary course.
U.K. Database of Historic Parks and Gardens - Database prepared by Landscapes and Gardens at the University of York, and enabled by grants from the Department of Culture, Media and Sport, and the Stanley Smith Horticultural Trust, containing outline information on sites, their locations by county, associated designers and contact names and addresses of those bodies that may have further information.