Your wisteria might be suffering from a fungus or some kind of insect infestation. Did you see anything out of the ordinary when you dug it up?
Also, if possible, you might want to go back to wherever you got the plant to determine the exact species and get advice from the previous owner.
No I didn't see anything out of ordinary.
Going back to the place I got it is possible, but..........
Let me paint you a picture:
I live in the western cape in south africa, and in the western cape is asmall town called Wellington. A beautifull little town. Surrounded by beautifull mountains with breathtaking passes that lead through the mountain to another town.
Just outside Wellington is a okay I guess nursery that sells food and all the normal stuff. Now... Its was at this place I bought the Wisteria. Their trees are stupid cheap but the material is as raw as they can come. The only problem with nursery is that they just don't care about their trees. And when it comes to getting info from them its even worse. There is a lady that knows her story around trees but when you ask for some info she almost bites you when anwering.
So really don't wanna go back.I will rather post some pics for you as soon as the tree starts getting leaves. Maybe you can then tell me which one it is.