I have a Wisteria it's been planted for over 10 years &it's not Flower
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If you are fertilizing then you probably have a lush shrub and never will get any flowers due to the energy going into the leaves and new growth.
Depending on the variety some do not bloom until at least fifteen yrs.old.https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm