How to Change the Color of Hydrangeas

How do you get blue hydrangeas?

Hardiness Zone: 8a

By tf1 from GA

May 6, 20090 found this helpful

My grandmother always said to put a rusty nail in the ground next to your plant, that will change the color.

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May 14, 20090 found this helpful

Rusty nail is for iron deficiencies. I think you add aluminum sulfate to the soil to get the blue color.

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July 20, 20110 found this helpful

Hydrangea blue or purple blooms come from highly acidic soil. You don't need to buy some chemical additive; you can get acidic soil by dumping your used coffee grounds on top of the soil.

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In This Article
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Changing the Color of Hydrangeas
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Growing Hydrangeas in Containers
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