Is there a way to get light blue hydrangea flowers to turn a deeper/darker shade of blue?

I know that changing the acidity of soil allows you to turn hydrangea flowers from pink to purple to blue. However, I notice that some shrubs in my neighborhood have light blue flowers (such as my hydrangea), while others have a deeper, darker shade of blue. I see the same within pink and purple varieties—variations in color saturation as opposed to the color itself. Is there a way to control this or encourage deeper colored flowers? Or does it depend on the plant variety?

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1 Comment To "Is there a way to get light blue hydrangea flowers to turn a deeper/darker shade of blue?"

#1 Comment By GKH_Susan On 06/26/2019 @ 10:25 pm

This Extension fact sheet says adding aluminum sulfate to the soil will make the blues darker.

https://easttexasgardening.tamu.edu/2014/07/16/hydrangeas-6/ ^[1]

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm ^[2]

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URLs in this post:

[1] https://easttexasgardening.tamu.edu/2014/07/16/hydrangeas-6/: https://easttexasgardening.tamu.edu/2014/07/16/hydrangeas-6/

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

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