I have a 5 year old wisteria with a beautiful thick vine. It reaches and wraps itself up throughout 3 of the trees on my property. But it has never produced a leaf or flower. I've thought many times of moving it but I'm afraid it would kill the plant. You are my last resort.
Certified GKH Gardening Expert
The soil may have too much nitrogen. Try to offset it with some phosphorus, like bone meal, to help promote more lush blooms. This article should also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm