Hi pinkbubbless66:
It's almost impossible to know what each nursery sells (unless they are a specific type nursery selling only one type of plant like Abundant Daylilies, which specifically sells only daylilies:
http://garden.org/reviews/view...)
For many other nurseries you would have to click the link and go to their website to browse their listings. Most on-line nurseries list the planting zones in the descriptions of each plant.
For example:
American Meadows lists zones for this Echinacea:
http://www.americanmeadows.com...
Santa Rosa Gardens lists zones for this Agastache:
http://www.santarosagardens.co...
