When we bought our present house it had a 9 foot tall Wisteria Pink Ice
growing up a west facing wall which didn't appear to have been pruned for
many years (although the house was only built in 1993 so it couldn't have
been prior to then). It produced lots of foliage with only a very few
flowers.
Two years ago, in desperation, we pruned it right back to the main stems.
Since then it has produced only shoots which have a few leaves close to the
main stems but then get very long and spindly. No flowers have been produces
since we originally pruned it.
Again this year, when other Wisterias are flowering, ours is only producing
the spindly shoots and a few leaves.
Can anyone let me know what we have done wrong and how tro correct it ?

Regards
Mike