I bought Seedless Che from Etsy, grafted on Maclura, which was really weird looking, even with long roots somehow looping few times before putting into plastic bag… and it seems “looping” plant spent at least a year there, with worms…
It spent Winter in a pot, in a basement, graft union was too weak to plant it outside.
https://growingfruit.org/t/che-fruit-maclura-rootstock-cudrania-tricuspidata-does-it-look-good/24653
After reading this forum posts I found myself not willing to waste time or space on it 
so I’ll plant it in fabrics pot to see what can grow from it and probably I’ll give it away. I am in zone 6b, Toronto, Canada, with roses still flowering in October-November, and super hot Summers.
Question:
Should I plant is with graft union below soil? I think I should. Maclura graft is used only as propagation method, and if tree will make its’ own roots then better chances for better healthy tree. Am I right?