Thanks for the response Richard, but I searched that thread and while there was a bunch of discussions re grafting Nadia 5+ years ago there was very little in the way of long term results posted.
Common post 6 years ago:
6 years later, still not much in the way of conclusive answers:
I searched the entire thread with the terms “interstem” and “graft”. There were lots of hits on people stating they were going to attempt various grafting combinations, but little in the way of long term results posted.
I’m guessing this probably means Nadia isn’t particularly compatible with other varieties, as people are far more likely to post about their grafting successes, rather than their failures.