Nantucket Hydrangea & Hydrangea Farm Nursery
- Offers and extensive listing of hydrangea cultivars. Many varieties, a few pictures.
- http://www.nantuckethydrangea.com/

Hydrangeas Plus
- Oregon nursery specializing in a large selection of species and cultivars of hydrangea. Includes images and information.
- http://www.hydrangeasplus.com/

Wilkerson Mill Gardens
- Specializing in hydrangeas and offering a selection of other shrubs and some trees.
- http://www.hydrangea.com/