- UW – Extension Horticultural Publications
- Summer Garden Inquiries-answered by Vijai Pandain, Horticulture Extension Educator
- UW – Plant Disease and Diagnostic Clinic
- UW – Soil and Plant Analysis Laboratory
- UW – The Wisconsin Gardener – Public TV
- UW – Urban Horticulture
- UWEX – Wisconsin Native Plant Sources
- Wisconsin Master Gardener Program
- University of Connecticut Plant Database
- Ohio State University WebGarden
- USDA Plants Database
- Weed Science Society of America
- Rutgers Extension Home, Lawn, and Garden
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