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How do I stop my blue hydrangea turning pink?

💡 Our Advice

Hydrangea Colourant from either Growing Success or Vitax contains powdered alum which enriches the soil with iron and magnesium and encourages the flowers to change from pink to blue. Treat the plants regularly.

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Answered by

Steve Bradley M.A M.Hort RHS

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How do I stop my blue hydrangea turning pink?

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