Japanese wisteria flowered but didn't send out new shoots afterwards. It has flowered for the last 3 years but this year, for the first time, it has not sent out new shoots after flowering. Every other year the new growth has been very vigorous.
Japanese Wisteria Flowering
Certified GKH Gardening Expert
I can't really locate any issues that directly would correspond with last of twiners forming.
Review the care information in the articles below.