Hi Sharon, I hope this helps! https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm
Don't feed it it'll grow Vines only if it gets nitrogen leave it alone prune the heck out of it courses at the bloom been there done it
drastic pruning. I had the same problem. after much research. I tried it it worked. not just above ground but roots. good luck.