Poor Wisteria Blooms

Question

My wisteria vine puts out less and less blooms each year. The vine base/root is shaded, but the vines are in full sun all day. It gets fertilized and watered as suggested. HELP.

Answer 1

I would guess that the nitrogen to phosphorus ratio is off. Even though you fertilize, without the right amount of phosphorus, it can't bloom well. Bone meal is a great way to add phosphorus. This article will also help:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm