Nikko Blue Hydrangeas
Q.

nikko blue hydrangeas

Zone Green Cove Spprings, Fla. zone 8 | Anonymous added on October 14, 2017 | Answered

I have nikko blue hydrangea 8 yrs. old. the 1st yr. they were blue. Now they are pink and lavender and have been since. I feed them acidic fertilizer. I have talked with the nursery man and he told me my water is probably neutral. Is there anything now this fall I can do to help them to come back to blue. I cannot change the ph of the water. Pls. help if you can and many, many Thanks.

A.
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Downtoearthdigs
Certified GKH Gardening Expert
Answered on October 14, 2017

It can be difficult to get soil down to a low enough (acidic) pH to get hydrangeas to really turn blue. Aluminum is also needed in the soil for the plant to create the blue color. Having a soil pH test done can show you how close you are to the necessary pH of 5.2-5.5.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm
http://web.extension.illinois.edu/ccdms/yg/060804.html

Aluminum sulfate can help with both the pH and the aluminum requirement:
https://www.ndsu.edu/pubweb/chiwonlee/plsc211/student%20papers/articles09/haylee%20a%20wax/pH%20affects%20on%20hydrangea%20-hw.html

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