Wisterier pruning

Dies anyone have any tips on pruning a white riot that goes over an arch. I have followed books thinking I have got it right but it never flowers all I end up with is loads of long new growth. Which I usually have to chop off again as it’s such a mess.
It has only ever had one flower☹️☹️☹️.
i hope someone can help.
It has only ever had one flower☹️☹️☹️.
i hope someone can help.
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try that