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Wisteria Frutescens needs sunshine to flower at its best, so the low light levels we've had this year may have contributed to a lack of blooms. If we get some more sunshine you may get a few more flowers this year. Frutescens flowers on new wood, so it would have done better if pruned last year. Prune it this year after flowering and then pinch out the tips of new growth throughout the rest of the growing season. That way you'll have lots of new wood to produce your flowers next spring. Maybe a little potash next spring to remind it to flower would be an idea?
Thank you so much for the advice.. being a novice I wasn't sure if I pruned it this year whether it would come back at all! I will get straight on it!
In case you're not sure, here's how to summer-prune wisteria http://www.gardenersworld.com/how-to/projects/pruning-training/how-to-summer-prune-wisteria/367.html