Answer: Plants can suffer from transplant shock and that's what it sounds like is happening with your wisteria. Since you found green tissue in the stems, they're still alive and that's a good sign. I'd give it the benefit of the doubt and allow it to grow for a few months more before giving up on it. Be sure to water deeply once each week and try pruning the stems down to encourage healthy new growth.
Best wishes with your wisteria!
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