Certified GKH Gardening Expert
First, I would check the roots since it's in a container. Normally, these don't make the best container plants as they need lots of room to grow. If the roots are constricted, it may need to be repotted (2 inches larger) or transplanted elsewhere.
In addition, I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus. This article will also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm