Answer: It is a good sign that it is growing well for you. A new vine will take about three years to settle in and become fully established and perform its best. Wisteria also needs to be trained and pruned to encourage blooming. But there are a variety of reasons why a wisteria might not bloom.
If it was blooming or had bloomed when you planted it, then you know it is mature enough to bloom. If it was a seed grown plant rather than grafted, and if you have not seen it bloom, then it may be a matter of it being immature. Seedling plants average about 8 years to bloom, but can take as long as 20 years.
Sometimes, spring frosts will damage the flower buds and prevent the plant from blooming as a result. Sometimes too an excessively cold winter can kill flower buds. Your zip code places you in zone 5A the coldest part of zone 5. Depending on your microclimate it might be as cold as zone 4. Wisteria sinensis is hardy only into zone 5, so this might possibly be a factor. Or, overfertilizing with nitrogen can cause excessive foliage growth at the expense of blooming.
You may find the following information on wisteria care helpful in trouble shooting as well. (You may need to cut and paste the complete url into your browser to make it work correctly.)
I hope this helps you trouble shoot!
Q&A Library Searching Tips