See also Horticulture databases.
- Backyard Farmer (UNL Extension) - Includes the Master Gardener Program and many UNL Cooperative Extension publications
- Dave's Garden - Gardening forums, seed trading, plus plant and bug identification databases.
- Garden Guides - "A collection of top-quality gardening information, including gardening how-to's by top garden writers, plant fact sheets and guide sheets, seasonal tips and garden techniques, garden recipes, and much more."
- Horticulture, Land Systems, and Management - Horticulture programs at Metropolitan Community College.
- Lawn & Garden - Links from the Michigan State University Extension Information program.
- Quia Activities- Horticulture 1100.
- Virtual Plant and Pest Diagnostic Laboratory (Purdue University) - Experts identify pests and other problems associated with plants.