See also Horticulture databases.

• Botany.com - The Encyclopedia of Flowers and Plants.
• Dave's Garden - Gardening forums, seed trading, plus plant and bug identification databases.
• Horticulture Studies - Horticulture programs at Metropolitan Community College.
• Michigan State University Extension Information Program - Includes many horticulture-related links.
• Ohio State University WebGarden - Contains over 4000 fact sheets and 20,000 pages of garden and horticulture information. the Plant Dictionary and PlantFacts (a FactSheet database) are the heart of this website.
• PLANTS Database - This database from the United States Department of Agriculture provides information about plants of the United States and its territories including scientific and common plant names and classification reports.
• Quia Activities- Horticulture 1100.
• TreeLink - Created by the National Urban and Community Forestry Advisory Council of the USDA Forest Service, this site provides educational materials, how-to guides, a research database, discussion forums, a listing of national and local sources, and interactive tools for tree identification and selection.
• UI Plants - A database of woody landscape plant identification, culture and usage for the Midwest.
• UNL Extension: Backyard Farmer - Includes the Master Gardener Program and many UNL Cooperative Extension publications.
• Virtual Plant and Pest Diagnostic Laboratory (Purdue University) - Experts identify pests and other problems associatied with plants.
• WWW Virtual Library Gardening Links - Links to state, regional and international gardening sites, subject specific gardening sittes, and a national calendar of events.