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Family Physician
Family Physician, Internet Researcher
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change colour of hydrangeas

Resolved Question:

change colour of hydrangeas
Submitted: 6 years ago.
Category: General
Expert:  Anna replied 6 years ago.
Hello,

Some additional information will help me to answer your question.

Are you wanting to change the color of your hydrangeas, or are you wanting to know why a change occurred?

Do you know the name of the variety of hydrangea?

Thank you.

Anna
Expert:  Family Physician replied 6 years ago.
The color is dependent on the particular variety and the availability of aluminum . Aluminum is necessary to produce the blue pigment. Most garden soils have adequate aluminum, but the aluminum will not be available to the plant if the soil pH is too high. For most bigleaf hydrangea varieties, blue flowers will be produced in acidic soil (pH 5.5 and lower), whereas neutral to alkaline soils (pH 6.5 and higher) will usually produce pink flowers. Between pH 5.5 and pH 6.5, the flowers will be purple (see image at left) or a mixture of blue and pink flowers will be found on the same plant.
Family Physician, Internet Researcher
Category: General
Satisfied Customers: 12816
Experience: Researching answers to questions online for 20+ years.
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