Answer: There are several possible reasons why your wisteria has not bloomed yet. One possibility, if it was grown from seed, is that it may still not be mature enough to bloom. The average age is about eight years, but twenty years or longer is not unheard of.
Sometimes wisteria will put on vegetative growth at the expense of flowering due to overfertilizing. If your vine is growing adjacent to a lawn that is fertilized regularly, for instance, then it would not need additional fertilizer.
Sometimes wisteria buds are damaged by spring frosts, thus preventing flowering. This can depend on the microclimate where it is planted and on the weather each year.
You might also review your pruning practices to see if you can encourage blooming that way.
Lastly, wisteria does best in full sun all day long, so it might like a bit more sun than it receives where you have it planted. Since moving it is not an option, you might try to give it the best care you can in other respects.
The following web page offers detailed information on growing and pruning wisteria you may find helpful.
I hope this helps you trouble shoot. Good luck with your wisteria!
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