This is absolutely false. The genetics creating the psychoactive agents are not shared by the stock and scion. only the grafted marijuana scion would have the THC and other psychoactive agents, not the hops stock. This is why apple trees with grafts can have more than one variety on the same tree. If your theory is right these would all be hybrids of the multiple grafts and this is not the case.
I am well aware what this would mean for multiple variety mother stock on one plant. If this was so easy it would be commonplace. Show me plants that have been grafted together for months not days.
What paladin said is absolutlely true....
The reason people tried to graft canabis on to hops roots was the hope that the thc was made in the roots....
We know that to be false today ..... but that was the logic.....
One thing that makes grafting cannabis so difficult is that you arent grafting dormant material....
best way is probably to remove all the leaves.... or at least most
if it works it will put out new growth....
New growth means success.....