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A poor performing wisteria sinenis prolific

As a novice gardener, I'm hoping someone can help me with the above. I bought the above plant in 2015, it has never flowered but the foliage looks pretty against the wall that it's secured to. It is positioned in a SW-facing garden, and when the sun bothers to show its face has a sunny aspect. Now this year, in the NE, we have had more than our fair share of summer rain yet the outer edges of the leaves are turning brown.
What am I doing wrong?
Should I be feeding it with something more than diluted worm wee?
I would love to see this plant begin to come into its own.
What am I doing wrong?
Should I be feeding it with something more than diluted worm wee?
I would love to see this plant begin to come into its own.
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Posts
With Wisteria it is always best to buy one in flower so you know what you have.
Sometimes it can take four years or so to flower but from 2015 seems too long.
Just to add the RHS web site is saying up to twenty years! News to me.
You are growing it on a sunny wall, the sun is stronger than years ago perhaps that is the reason for the brown leaves?
The stronger one does get fed and watered because it has a small bed at its feet which I have improved with mulching and then watered to establish new shade loving plants. The other is also healthy but smaller as it gets pruned more to keep it out of gutters and windows. It's planted straight into the beaten earth at the adge of our drive and gets watered when it rains.
It may well be that yours is simply not getting enough nutrients and moisture to let it establish properly. A photo of what it looks like and how it's planted would help.