Blue flowers: increase soil acidity with aluminum sulfate.
Pink flowers: add lime to soil to make it more alkaline.
Note: This only works with certain hydrangea types (bigleaf).
Bonus Tip
Keep indoor hydrangeas in a cool room with high humidity.
Mist leaves lightly or place a water tray nearby to boost moisture levels.
Conclusion
Hydrangeas may seem delicate, but with consistent care, proper watering, and attention to light and soil, they can thrive beautifully at home. Follow these tips, and your hydrangeas will reward you with lush leaves and stunning blooms year after year.
