What type of vendor would you use? Do they just sell plants? Do they sell irises of their own? our first started selling for club hybridizers & then started producing MDBs on their own. Our present vendor sells their own plants & sells a few plants for other people they know, but is not a huge operation for other people.
Even Mid America sells for other people in their climate. A vendor in other climates than your own would certainly have to grow your plants for several years to see how they 'do'. Could you find a vendor in your climate?
Start as we did by sending plants to the national AIS conventions. You not only meet people, but you see how your plants grow in different climates. If you grow TBs instead of medians like we do it is really necessary.