Yeah, you pretty well are buying a "pig in a poke" .....not just on e-bay ! (box stores, too!) That said, there are some very good vendors on e bay....and some very good plants to be had. You *might* be wise to use the "ask questions" feature, to "feel them out" as to "what do I do if it turns out wrong" ? I would think a "competent" vendor would share the provenance of the plant with you, and , you may end up with a new "iris buddy", in the bargain !