| Name | Description |
| American Horticultural Society | Home page of this national association includes heat zone map, Master Gardener program information, youth gardening program materials and more. |
| Bowman's Hill Wildflower Preserve | Bucks County resource emphasizing native plants. |
| Bulb.com | Excellent overview of the bulb industry, including history. |
| Center for Urban Horticulture University of Washington | Includes links to good gardening sites . |
| Citation Styles-Online! A Reference Guide to Using Internet Sources | Examples of how to cite from APA, MLA, CBE and Chicago style manuals. |
| Floriculture.com | Rich with statistics, products, search, communication and navigation tools to facilitate finding information about floriculture industry. Click on the "Reports" tab for stats. |
| Gardenscape | Information resource for home gardeners and professionals in gardening, landscape, and nursery industries. |
| HerbMed | Herb information. |
| I Love Gardens.com | Nation-wide list of public and private gardens and arboreta, searchable by state. |
| International Herb Association | Professional trade association. Good list of links. |
| Invasive Species.gov | National Agricultural Library's resource rich site, focusing on plant and animal alien species that threaten native plants and animals. |
| Jobs in Horticulture | Current list of OH job opportunities |
| Nuts And Bolts of College Writing | Overview of major components of college writing, including sections on documentation with examples of MLA, CBE, Chicago and APA citation formats. |
| Penn State College of Agricultural Sciences | Searchable site includes material from over 10,000 pages from Penn State's ag sciences college. |
| Pennsylvania Horticultural Society | Founded in 1827, PHS sponsors Philadelphia Flower Show, Green Scene Magazine and Gold Medal list of Plants for Delaware Valley region. |