Advice on gardening

Alnwick Garden Project, a modern garden by the Duchess of Northumberland.
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American gardens

American Garden Museum
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Smithsonian Archives of American Gardens (AAG),
managed by the Smithsonian's Horticulture Services Division, offers landscape designers, historians, preservationists, and garden enthusiasts access to a collection of approximately 60,000 photographic images and records that document historic and contemporary gardens throughout the United States.
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U.S.A. Gardens listed by State

Australian Garden History Society
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Australian gardens visitor's guide.
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Better Homes and Gardens Australia magazine.
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Royal Botanic Gardens Melbourne

Austrian Gardens to Visit
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Imperial Austrian palaces and gardens.
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Mirabell Gardens, Saltzburg.

Backyard Gardener  
A one stop informational site to help people understand their gardening needs. Backyard Gardener provides gardening plans and plant lists to enhance your gardening knowledge.
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Bamboo. International Network for Bamboo and Rattan
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Baroque gardens.
Information, with links to High Baroque garden websites. Gardenvisit.com
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Belgium and Europe. Garden Art and Gardening
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Better Homes and Gardens
An online magazine.
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Bonsai garden internet links.
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Botanical gardens

Australian National Botanic Gardens
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Chelsea Physic Garden
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Gardens of Knowledge
An Exhibit of Books About Botanical Gardens
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New York Botanical Garden
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Open Directory Project directory of botanical gardens and arboreta.
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Royal Botanic Gardens, Kew.
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The United States Botanic Garden

Castle Howard, Yorkshire, England.
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Chinese gardens

Chinese Gardens. Traditional Chinese gardens.
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Photos of Chinese gardens of Yangzhou and Suzhou.
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The Classical Chinese Garden Society Homepage

Directories, guides

Web Garden Guide.com
Information on gardening, growing plants, herbs, flowers and vegetables.
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Garden and gardening resources from WWW Virtual Library.
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Garden Gate. Gardening and horticulture websites.
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Garden links to websites.
French, Italian, Austrian, German, English gardens.
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Garden Visit and Travel Guide
An international garden directory. British gardens, American gardens, European gardens, garden style diagrams, garden designers index.
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The Garden Visit and Travel Guide
Places of interest to gardeners: properties open to the public, historic estates, botanic collections, websites, place and name indexes, styles, maps.

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English gardens

English Gardens
An internet resource page. Search by theme.
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British (U.K.) private gardens,
a web directory from The Open Directory Project.
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Capability Brown
The life and works of England's greatest landscape gardener and his influence on the Royal Palaces and Stately Homes of the Unidted Kingdom.
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Country Life  Online, UK. Historic gardens and houses.
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The English garden, a history.
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Garden design in the British Isles since 1650.
Articles, gardening / gardening web links.
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Gertrude Jekyll website.
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Hampton Court, Herefordshire, UK.
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Heligan Gardens
Restoration of the lost gardens of Heligan, Cornall, England.
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Historic Gardens Foundation, UK.
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History of Gardens
The Garden History Society, UK.
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The National Gardens Scheme, UK.
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Royal Botanic Gardens, Kew, London.
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ThinkinGardens
The ThinkinGardens Group has been set up, with the support of the Royal Horticultural Society, in its role as a learned society, to encourage and develop a broader, more enquiring attitude to gardens. This will encompass the aesthetic of gardens, the philosophy of gardens, and what gardens mean or can offer. The Group’s work is aimed at stimulating both gardeners and non-gardeners alike.
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UK Gardening Web Ring

French gardens

French Gardens. An article with illustrated examples.
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French gardens:
a searchable directory from  Eden Planet.
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17th Century French Gardens
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Sisley Garden Tours in France

Garden and gardening resources from WWW Virtual Library.
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Garden Gate
Gardening and horticulture websites.
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Garden Visit and Travel Guide
An international garden directory. British gardens, American gardens, European gardens, garden style diagrams, garden designers index.
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GardenWeb
An internet directory and garden community.
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GardenWeb Italia. Italian gardens.
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Garden and gardening links from WWW Virtual Library.
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The Garden Visit and Travel Guide
Places of interest to gardeners: properties open to the public, historic estates, botanic collections, websites, place and name indexes, styles, maps.
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The Garden Picture Library
An archive of garden pictures.
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GardenWeb Europe. A directory of European gardens.
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German gardens

Dessau-Wörlitz Garden Realm, also known as the English Grounds of Wörlitz,
is one of the first and largest English parks in Germany and Europe. Wikipedia

Official site of the Dessau-Woerlitz Garden Realm
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Official site of the Wörlitz Park

Gardens to Visit in Germany
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Parks and gardens of Germany. German tourism website.
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Sanssoucci palace, Potsdam.
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Schloss Augustusburg

Gertrude Jekyll website.

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Hampton Court, Herefordshire, UK.
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Heligan Gardens
Restoration of the lost gardens of Heligan, Cornwall, England.
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History of Gardens

History of Gardens. The Garden History Society, UK.
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History of Gardening, Wikipedia entries.
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Historic Parks, Stately Homes and Gardens Database, UK.
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Historic Gardens Foundation, UK.

Indian gardens

Indian Gardens
(with selected garden history keydates and links to information for visitors).

GardenWeb Italia
Italian gardens.
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Garden tours of Italy.