A bunch of purple hydrangeas
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Turn Your Hydrangeas Purple With These Simple Tips
Hydrangeas come in shades of white, blue, pink, green, red, and purple, depending on the acidity of the soil. For purple hydrangeas, your soil will need to have a neutral pH.
Per Balcony Garden Web, in order to turn your hydrangea purple, you should aim for a soil pH of 6.5 to 6.8. First, run a pH test on the root-level soil before planting the flowers.
Grab a litmus test kit and follow the packet's instructions. Then, if your soil is too basic and you want purple flowers with a bluish tint, you can add some Espoma soil acidifier.
For a redder purple, you can increase the soil pH by adding garden lime to it. Finally, sit back and wait — you'll see the results fade in gradually after constant application.