To adjust the color of hydrangeas, you're mostly working with the soil pH—because hydrangea color is pH-dependent. Here's how to change them: --- 🌸 To Make Hydrangeas Blue Lower the soil pH (more acidic, below 6.0) Add aluminum to the soil, which is needed for blue color 🧪 How to do it: Mix in aluminum sulfate (follow package directions) Mulch with pine needles, coffee grounds, or peat moss Avoid lime or high-phosphorus fertilizers (they block aluminum) --- 🌸 To Make Hydrangeas Pink Raise the