Ask an Arborist
- A forum for asking for advice on the care of trees, principally with a UK focus.
- http://www.tree-care.info/ask

The Gardener's Forum
- A very active gardening forum with members from around the world.
- http://www.agardenersforum.com

Gardens Monthly Magazine.
- The website of Gardens Monthly magazine with an active forum for swapping ideas and solving problems.
- http://www.gardening.co.uk

Excuse the Weeds
- A forum and the ability to browse members' gardens. Listing new gardens is only available to paying members.
- http://www.excusetheweeds.co.uk

Grows on You
- A free social network for gardeners that provides photo upload, gardening blog and a feature to list plants.
- http://www.growsonyou.com

MYeFlora
- MYeFlora is a complete garden resource and community: A Channel for all gardeners to come together to share knowledge and information for the benefit of other gardeners.
- http://www.myeflora.com

Moosey's Country Garden Forums
- Discussion forums, garden journals and photo galleries, with topics including tours, plant identification, roses, and chat.
- http://forums.mooseyscountrygarden.com/

Gardeners at Witzend
- Family-friendly site offering gardening forums, members photo albums, and member-contributed links.
- http://www.witzend.net/

PlantTraders
- Online community of friends and gardeners, sharing experiences, plants, and seeds.
- http://planttraders.ipbhost.com/

Northscaping
- Information resources, e-zine, forums, and links of interest to Northern gardeners and landscapers (USDA hardiness zones 1-5). Includes a landscape plant search, articles, climatic data, and business locators.
- http://www.northscaping.com/

Tinker's Gardens
- This site focuses on daylilies, providing articles on their cultivation and hybridization, as well as an extensive database. Also provides discussions of some other flowers and vegetables. Most of the action is in the many forums.
- http://www.tinkersgardens.com/

Hort.net: Archived Active Horticultural Mailing Lists
- Maintains archives of about 30 gardening-related mailing lists, with a link to archives of additional now defunct lists.
- http://www.hort.net/lists/

Just Gardeners
- Includes forums, articles, catalog reviews, and a plant and seed swap area.
- http://justgardeners.com/

Homestead Garden
- Online community focused on gardening with a simplified-living bent. Forums, a few articles, links to extension services, and printable journals and logs.
- http://www.homesteadgarden.com/

Gay Gardener
- Offers planting tips, gardening history, forums, quotes, and a monthly newsletter.
- http://www.gaygardener.com

GardenBuddies.com
- Forums and photo galleries covering many gardening topics, visited by an international audience. Archives of plant information.
- http://gardenbuddies.com

GardenBanter
- A web front to several usenet newsgroups, covering general, regional, and water gardening topics. Threads are displayed forum-style. Posting requires registering with the site.
- http://www.gardenbanter.co.uk/

UKY Listserv: Gardens & Gardening
- Worldwide community chats via an e-mail mailing list on a wide variety of topics including gardening. Archives online available to members of the list.
- http://lsv.uky.edu/archives/gardens.html

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

GardenWeb Australia
- Hosts forums, garden exchanges, articles, contests and a plant database.
- http://www.au.gardenweb.com/

You Grow Girl
- Offers a young fresh twist on gardening information, tips and articles. Discussion forums and archives available.
- http://www.yougrowgirl.com/

Garden Stew
- Discussion forums on several gardening topics, as well as a few home improvement topics.
- http://www.gardenstew.com/

Garden Country
- Message board for communing with other gardeners. Includes a butterfly garden guide, weed identifier, and e-cards.
- http://www.gardencountry.com/

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/

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/

SeeMeGarden
- Community of gardening enthusiasts sharing tips, advice, experiences, and knowledge covering many aspects of gardening.
- http://www.seemegarden.com/

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/

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/