By Daveyeff
United Kingdom 
done what you said,,,dug a deep hole and lifted out the wisteria. put gravel in the bottom then soil /manure etc on top of that. unfortunately though, the wisteria has had it. it snapped at the graft point, and it was rotten and black inside, i hope its not that horrible root disease. the roots below the graft point seem fine and healthy though, so i assume (hope) it was graft failure and not the other. if it is that root disease, will it spread to and affect the new ones ive just put in? cheers.
5 Jun, 2014
Answers
Davey, welcome to GoY.
In future, it would be best to post your response with the original question underneath the answers in the comment box.
That way, those who answered, will see your response, and know exactly what the response relates to.
6 Jun, 2014
they should be fine . look over the whole plant to look for signs of damage as grafts are normaly very strong .
6 Jun, 2014