Dave's Garden
Maintain plants and seeds inventory, discuss gardening, and trade seeds and plants with fellow gardeners. Many features are only available to paying members, some also to the general public.
http://davesgarden.com/ - Detail
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I Can Garden
Canadian gardening resource site by editor and Master Gardener, Donna Dawson. Includes a member's area, news, articles, book reviews, clubs, suppliers, pictures and links.
http://www.icangarden.com/ - Detail
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SeeMeGarden
Community of gardening enthusiasts sharing tips, advice, experiences, and knowledge covering many aspects of gardening.
http://www.seemegarden.com/ - Detail
Google PR

The Helpful Gardener: Garden Forum
A discussion forum for the home gardener. Members provide helpful answers for home gardening questions in a number of topics.
http://www.helpfulgardener.com/phpBB2/ - Detail
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GardenWeb
Community of gardeners offering a wide range of resources. Forums on a large variety of general and specialized topics, glossary of botanical terms, seed exchange, and plant directory.
http://www.gardenweb.com/ - Detail
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Garden Country
Message board for communing with other gardeners. Includes a butterfly garden guide, weed identifier, and e-cards.
http://www.gardencountry.com/ - Detail
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Garden Stew
Discussion forums on several gardening topics, as well as a few home improvement topics.
http://www.gardenstew.com/ - Detail
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You Grow Girl
Offers a young fresh twist on gardening information, tips and articles. Discussion forums and archives available.
http://www.yougrowgirl.com/ - Detail
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GardenWeb Australia
Hosts forums, garden exchanges, articles, contests and a plant database.
http://www.au.gardenweb.com/ - Detail
Google PR

Blossom Swap
Lively community of gardening enthusiasts, forums, plant and seed swaps, articles, gardening tips, and photographs.
http://www.blossomswap.com/ - Detail
Google PR