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.
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.
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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