Have continued researching. I can't find the Kaki rootstock either. The ext. agent here said D. lotus rootstock is causing some terrible problems in the humid South. I guess that leaves only D. virginiana -- and suckering.
I'll go by the local nursery today and see what I can learn about the products they might offer.
A word of caution to ebay users -- be sure to ask about the rootstock before purchasing!
