How to Change Hydrangea Flowers From Pink To Blue

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Tips for gradually changing light pink Bigleaf (Hydrangea macrophylla) and Mountain (Hydrangea serrata) from pink to blue.

Prep Time: 20

Cook Time: 20

Total Time: 40

Cost: $35.00

Plant hydrangea in container with suitable potting mix.
1 shrub Hydrangea
Test soil pH and record value.
Take photos of any flowers that form from now onward.
In fall, water plant thoroughly then apply half dose of aluminum sulfate per product instructions (usually 1.5 teaspoon in 1 gallon water).
1 bag Aluminum Sulfate
Overwinter plant as needed to protect from freezing temperatures.
In spring, at bud break, apply another half dose of aluminum sulfate.
Measure soil pH every few months and compare.
When pH is 5.6 or lower, hydrangeas can take up aluminum in soil and gradually turn light blue.

For instructions on turning light blue flowers to pink, see https://empressofdirt.net/change-hydrangea-colors/