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By
07/20/2011
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.
By
05/14/2009
Rusty nail is for iron deficiencies. I think you add aluminum sulfate to the soil to get the blue color.
By
05/06/2009
My grandmother always said to put a rusty nail in the ground next to your plant, that will change the color.
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.
By Mara from Seattle, WA
By looneylulu
05/06/2011
Acid content of soil is deciding factor in making Hydrangea blue or pink. Just forget whether it's high or low acid content.
Do you have a blue mophead hydrangea that you would like to be pink? Or, do you have a pink hydrangea that you want to turn blue?
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