Potted hydrangeas require regular and thorough watering to keep their soil consistently moist but not soggy. Here are key guidelines for watering potted hydrangeas:

• Water the plant deeply several times a week rather than giving small amounts daily. For example, watering about 3 times a week is recommended, especially during warm or hot periods

• Check the soil moisture daily by feeling the top inch of soil; if it feels dry, it's time to water. On hot summer days, watering may be needed even twice a day

• Water thoroughly around the entire base of the plant until water drains out of the bottom of the pot to ensure the roots are well hydrated

• Avoid letting the pot sit in standing water to prevent root rot; ensure the pot has good drainage

• Water preferably in the early morning or evening when the plant can absorb water best and to avoid wetting the flowers, which can cause disease

• For indoor potted hydrangeas, immerse the pot in water once a week as an extra treat but avoid overwatering to prevent root damage

In summary, watering potted hydrangeas every 2 to 3 days or as needed based on soil moisture, with deep watering sessions that saturate the root zone, is ideal. Adjust frequency depending on temperature, pot size, and sun exposure to keep the soil moist but not waterlogged