Along with Nursery catalogs; seed catalogs have been a source of plants for Irisarians. Of course cultivars do not come true from seed but species and botanical varieties were often offered. The following are historic sources of Iris seeds.
Correvon's Seed Catalog
To add a nursery go to WebCreateNewTopic and start the name of the topic with SeedCatalogs_ and it will be added to the list below. These are wiki titles used to navigate between topics see list above for regular language.