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Speaking from experience....
We had wisteria for several years that never bloomed, it grew like crazy but never bloomed. We were told to put a certain fertilizer on it. It was 18-46-0 and potash. I do not remember the portions and when we did it but it did work. I am sure a greenhouse could tell you more.
Since the wisteria makes it own nitrogen get a fertilizer with very little to no nitrogen
The middle number and the last number is what you want for example 5-14-14 would be best.
I've been told, that wisteria loves abuse. It's the vines with a purple hue that are the ones the will make the flowers. In the later part of summer, just strip the leaves off.
We have a large wisteria & one year it didn't bloom & leaf out like it should (we thought it was dead). We found out that our (stupid) next door neighbor had poured bleach in that area on his side of the fence to kill weeds & it got into our wisteria's root system. Thankfully the wisteria came back the next year. Some years it blooms earlier than others by almost a whole month (depending on the weather).
Be grateful and pull it up while you still can! lol I have this stuff all over my yard and can't stop the spreading of it. The root system is like ropes and it takes over everything. My neighbors started it about 70-80 yrs ago and nothing stops it, I DO mean nothing!
Actually, I'm in zone5 and I have a wisteria that I planted 4 years ago and this is the first year it bloomed. I was told before I planted it that it could take about 5 years before it had it's first blooms, even though the greenery was taking over the trellis like crazy!
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