How to Make Hydrangeas Blue
Hydrangeas turn blue based on the pH of the soil they are in. A pH lower than 6.0 will typically give you blue or lavender-hued flowers. When the pH is above 7.0 (alkaline), it gives pinks and reds. If you have a pink hydrangea and you want it to be blue, you need to bring those pH levels down in the soil. You can do this by adding sulfur or aluminum sulfate to the soil itself.
If your blooms are currently pink, that means your soil is naturally alkaline. You can turn them blue by adjusting this and making the soil acidic. Using an aluminum sulfate to keep them blue? Add about 4 tablespoons of it to a gallon of water and drench the base of the plant about every 2 to 4 weeks.
How to Make Hydrangeas Pink…
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