When and How Should Wisteria Be Pruned?
We have tremendous growth but very few flowers.
Certified GKH Gardening Expert
This article will help with pruning: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm
As for the abundant growth and little flowers, this could be due to a nitrogen/phosphorus imbalance. Too much nitrogen can lead to lots of growth with little to no flowering. Adding more phosphorus, like bone meal, can normally help offset this. Here is more help with blooming issues: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm