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/

Gardening For Nutrition
- Guidance for gardening and food intake with the purpose of maximizing nutrition.
- http://celticbuttonbox.com/GardenForNutrition/

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

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

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

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/

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.com/gardening/

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/

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.
- http://www.peagreenboat.co.uk/

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

MyGardenGuide
- Offers plant database with photos and summary information, Q&A on various garden topics, and a garden blog.
- http://www.mygardenguide.com/

Mimi.hu: Gardening
- Provides a directory of biological and horticultural terms, with links to online encyclopedia entries for each term.
- http://en.mimi.hu/gardening/index_gardening.html

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/