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What can I use to make pink hydrangea produce blue flowers?

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Usually, the flowers will be pink if there is lime in the soil and blue if there is not. You can use Hydrangea Colourant from Vitax to change the flower colour. This treatment will need to be repeated every year. Avoid watering the plant with tap water, as this often contains lime.

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Answered by

Steve Bradley M.A M.Hort RHS

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What can I use to make pink hydrangea produce blue flowers?

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