It is in the ground, fertilized once with 10-20-10 and twice with weak 20-20-20. Full sun from noon to sunset. Usually the complaint for wisterias are that they grow like crazy but don't bloom, mine is the reverse, that's why I had to ask.

What would be the root stock they are grafted to? Since it died back to the ground, it is possible that the growth is no longer Blue Moon.