Bob Vance reported this about Just Fruits and Exotics in an earlier thread.
Just Fruit and Exotics- They sell very nice potted trees (1/2"+ caliper) and are who I got my first So from in 2011. This time I got two more and a Tigertooth and planted in mid-October. The Tigertooth has grown well, almost as good as the ToA trees. The So both had a lot of die-back, one to the ground and the other to within a few inches of it. I emailed them to ask if they were grafted or propagated from cuttings, as I wasn’t able to locate a graft union. They responded that they propagate them from softwood cuttings in summer, so all the re-growth should be So and not a wild rootstock. This seems like a big benefit to me, and not just in die-back situations (which should be pretty rare, as my old So has never died back). I’ve got several suckers from it, one of which I’ve transplanted and grafted. I had plans to do the same with the others, but now I can just transplant them without grafting. @forestandfarm may be particularly interested in this.