flowering

Question

I have had a wisteria vine for 4 years and although the foliage is gorgeous, it has never flowered. Any idea?

Answer 1

I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not 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