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How to change a hydrangea’s colour

Blue, pink or purple - collect the set.

A few of our hydrangea have flowered and are a lovely blue, but did you know you can change a pink one to blue?

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I have a lilac one by my front door which I am going to try this on.

Instructions:

  • Dissolve 1 tbsp alum (potassium aluminium sulphate) in 3.5L water.

  • Water into the soil of your plant while its buds are just forming.

To keep pink hydrangeas pink or turn blue ones pink – add garden lime to their soil.

By the way, you can’t change the colour of a white hydrangea so enjoy it for what it is!

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Bonus trick: A fun kid’s version of this is to colour cut flowers by putting food colouring in their water. This also works with celery!

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