Turning My Hydrangea Blue


How can I turn my hydrangea blue? I am hoping it is something that I would have on hand.

Hardiness Zone: 4b

Helenw from Ontario Canada



Hi Helen,

If you're growing Hydrangea Marcrophylla (French hydrangea) you can turn it from pink to blue by lowering the pH level of your soil. The color is determined by the amount of aluminum available to the plant. Add 3 to 4 tablespoons of aluminum sulfate to a gallon of water. Apply it 2 times, 2 weeks apart, for 4 to 6 months prior to blooming. You can also add coffee grounds, eggshells or ground-up citrus peel to the soil. You're shooting for a pH of 5-6.

On a similar note, blue hydrangeas can be changed to pink by adding 3-8 cups (depending on the size of the plant) of dolomic lime around the base of the hydrangea. Do this 2 or 3 times between the blooming seasons. As an alternative, you can also try a bit of superphosphate around the base of the plant. Shoot for a pH of 6.8-7.2.


The color change doesn't happen overnight so be patient. It can take as long as a year or two to see the results. The white varieties of hydrangeas (such as PeeGee, Silver Leaf, Hills of Snow, etc.) cannot be changed. They remain while regardless of tampering with the pH of the soil.

Good Luck!

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May 12, 20060 found this helpful

The color is determined by the "Ph" of the soil. your extension agent will test for you free. In my case(and with-out test) I had pale blue and added diluted lemmon juice got deep blue as result.Good luck.


jerryno1 Yorktown Va.

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By Margie Minard (Guest Post)
May 12, 20060 found this helpful

The blue comes from acid soil. I have heard that just putting your used coffee grounds under the bush every day will do the trick. It is very good for the soil, anyway.

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By Jill from Iowa (Guest Post)
May 13, 20060 found this helpful

I have also heard that burying pennies around the roots will help. (Obviously the copper.)

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May 17, 20060 found this helpful

Hydrnageas are one of the few plants that store aluminum. To turn pink/purple hydrangeas blue, add a small amount of aluminum to the soil. White hydrangeas cannot change colour.

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By Patsy Jones (Guest Post)
June 12, 20070 found this helpful

What happened?

Ennis, Tx

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