| ceiba.org | Orchid Reserve, El Pahuma - Orchids |
| alaskarosesociety.org | Seed Germination of Wild and Cultivated Roses |
| sfasu.edu | Seed Propagation - The Basics |
| csu.edu.au | Society for Growing Australian Plants - Native Plants |
| ufl.edu | University of Florida - Workshops |
| backyardgardener.com | Seed Germination Database |
| tamu.edu | Texas A&M University - Mutated Plant Propagation |
| cornell.edu | Cornell University, Cooperative Extension - Propagation of Houseplants |
| texas-rose-rustlers.com | Texas Rose Rustlers - Old Fashioned Roses |
| succulent-plant.com | The Succulent Plant Page - Succulent Plants |
United Kingdom , Nottingham , Nottingham