Q.wisteria rarely blooms
We have wisteria vines that cover a pergola. They are about 10 years old but rarely bloom and very sparsely when they do. We live in Arkansas and they get full sun.
Was your wisteria bought at the nursery or grown from seed? Wisteria grown from seed can take up to 15 years to bloom, as incredulous as that sounds.
The following article details the reasons for non-blooming wisteria and offers suggestions to remedy it:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm
Does the wisteria develop buds that just aren't opening? If so, this article will help you:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm