Some time ago, I had a question from a lady in London: it was about her Wisteria, which had failed to flower for the past 20 years. This is quite a common question, along with "How and when do I prune it?" so I thought I'd repeat and expand my answer to her.
Firstly, there are three reasons why Wisteria refuse to flower: lack of sun, incorrect pruning, and lack of nutrition.
Well, four, if you include........
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