Mimi.hu: Gardening - Provides a directory of biological and horticultural terms, with links to online encyclopedia entries for each term.
MyGardenGuide - Offers plant database with photos and summary information, Q&A on various garden topics, and a garden blog.
Pioneer Thinking: Gardening Center - Information and tips on outdoor and indoor gardening. Many articles grouped by topic.
Biodynamic Gardening - Information on this method of gardening using mineral preparations and planetary rhythms, and services including workshops and garden design. Based in the UK.
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.
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.
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.
Garden Terms - Gardening dictionary with brief definitions of a large number of terms, optionally arranged by category.
Garden Ideas - Articles and advice on a variety of gardening topics.
LoveToKnow Garden - Short informational articles on gardening topics, vegetables, and ornamental plants, contributed and edited by users.
AOL Home - Gardening - Find tips and advice for home gardening.