How Do I Make Hydrangeas Bloom Blue?

I had some hydrangeas that were blue, and now they are pink. What can I do to make them blue again? My grandmother used to dump her coffee grounds on them, but I'm not sure that's what kept them blue.

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By mara from Seattle, WA

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May 6, 20110 found this helpful

Acid content of soil is deciding factor in making Hydrangea blue or pink. Just forget whether it's high or low acid content.

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Anonymous
May 14, 20160 found this helpful

Yes! I dumped my used coffee grounds (along w/ the biodegradable filter) around the base of my hydrangea bush all winter and when they bloomed in spring/summer, they were almost a cobalt blue! Just amazing.

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May 14, 20160 found this helpful

Yes, it's the acid in the coffee grounds. I dumped my used coffee grounds (along w/ the biodegradable paper filter) around the base of my hydrangea bush during the winter months, and by spring the blooms were a brilliant almost cobalt blue.

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Amazing!

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