Pioneer Thinking: Gardening Center - Information and tips on outdoor and indoor gardening. Many articles grouped by topic.
http://www.pioneerthinking.com/gardening.html

Garden Terms - Gardening dictionary with brief definitions of a large number of terms, optionally arranged by category.
http://www.gardenterms.com/

Yardener.com - Lawn and garden resources for homeowners whose garden is not their hobby. Includes information and care data for many plants, shrubs, and trees, and dealing with pests and problems.
http://www.yardener.com/

Exploratorium: Science Of Gardening - Features articles and videos on several topics, including gardening with nature, carnivorous plants, soils, fruits, and vegetables, propagation, and plant reproduction.
http://www.exploratorium.edu/gardening/

Garden Ideas - Articles and advice on a variety of gardening topics.
http://www.gardenideas.com/

MyGardenGuide - Offers plant database with photos and summary information, questions and answers on various garden topics, and a garden weblog.
http://www.mygardenguide.com/

Ohio State University PlantFacts - Collection of horticultural resources, including a search engine drawing from U.S. university factsheets, plant image database, how-to videos, illustrated FAQs, and glossary.
http://plantfacts.osu.edu/

Hort.net - Offers a collection of garden reference materials, including a plant gallery and profiles, archives of mailing lists, gardening news, and links.
http://www.hort.net/

Let's Go Gardening - General gardening site, with versions geared towards US and UK gardeners. Tips and articles, informational resources, links to events, societies, and public gardens, and a forum.
http://www.letsgogardening.co.uk/

P. Allen Smith Garden Home - TV host, writer, and professional gardener, P. Allen Smith provides tips on a variety of gardening topics, along with his biography, recipes, and instructional videos.
http://www.pallensmith.com

LoveToKnow Garden - Short informational articles on gardening topics, vegetables, and ornamental plants, contributed and edited by users.
http://garden.lovetoknow.com

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