Why Do Hydrangeas Change Color?


Have you ever had a blue hydrangea turn pink? Here are some things you need to know on how to keep or change the color of your hydrangeas.

The change in the color of your hydrangea is due to the pH of your soil. Soil runs from acidic to alkaline with varying degrees in between.

Hydrangeas prefer and do best in soil on the acid side just like azaleas, rhododendrons, Japanese maples, etc.

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If your soil is more alkaline, then your hydrangeas will be pink or pinker.

If your soil is more acidic, pH around or less than 5.5, then your blue hydrangeas stay blue or bluer.

Many white hydrangeas don’t change color but they might turn greenish as the flowers age.

If you’re unsure of your soil’s pH, you can find a soil lab in your state or buy a simple soil pH test kit or pH meter online.

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