nikko blue hydrangeas

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.

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1 Comment To "nikko blue hydrangeas"

#1 Comment By Downtoearthdigs On 10/14/2017 @ 5:06 pm

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 ^[1]
http://web.extension.illinois.edu/ccdms/yg/060804.html ^[2]

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 ^[3]

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URLs in this post:

[1] https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm

[2] http://web.extension.illinois.edu/ccdms/yg/060804.html: http://web.extension.illinois.edu/ccdms/yg/060804.html

[3] https://www.ndsu.edu/pubweb/chiwonlee/plsc211/student%20papers/articles09/haylee%20a%20wax/pH%20affects%20on%20hydrangea%20-hw.html: https://www.ndsu.edu/pubweb/chiwonlee/plsc211/student%20papers/articles09/haylee%20a%20wax/pH%20affects%20on%20hydrangea%20-hw.html

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