Hibiscus syriacus pupurea variegatus

Question from Shoot User

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I have var hamabo, and oiseau bleu all planted at the same time as my pupurea variegatus - the first two have flowered beautifully this year but although the purpurea is covered with buds they have not turned into flowers. All the plants have been treated exactly the same so would you know why the purpurea's buds do not open?
I look forward to hearing from you - thank you