Hydrangeas need consistent moisture but should not be overwatered. Here is a summary of how often and how to water hydrangeas effectively:

• For indoor hydrangeas: Keep the soil moist and immerse the plant once a week for extra hydration. Avoid overwatering to prevent root rot, and keep flowers dry when watering

• For newly planted garden hydrangeas: Water at least three times a week to help establish strong roots, especially during hot or dry weather. Use mulch to retain soil moisture

• For established garden hydrangeas: Deep watering once a week is usually sufficient if there is no rain. In hot, dry conditions, water more frequently. Water when the top inch of soil feels dry

• Watering technique: Water at the base of the plant early in the morning or in the evening to minimize evaporation and avoid wetting the leaves, which can cause leaf burn or disease

• Adjust frequency based on weather: Water daily during hot, sunny weather, or every other day when temperatures are cooler. Watch for signs of needing water such as drooping leaves; overwatering can cause yellow leaves

In summary, hydrangeas prefer moist but well-drained soil, with watering frequency ranging from several times a week to daily in extreme heat, always ensuring the soil does not stay soggy