Why Japanese wisteria will not bloom

Question

Have a plant that was labeled American wisteria, bloomed 2 yrs. in a row. The Japanese variety some planted 4 yrs. ago some planted last, have not bloomed.

Answer 1

This article has some suggestions as to why flowering is delaying: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm