How often should I water hydrangeas in winter?
Written by
Liu Xiaohui
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Watering hydrangeas in winter takes different tactics for container versus garden plants. Container plants are checked monthly for moisture, while ground plants only need a freeze prep before rest. My adjustments are based on the plant's location and the local weather conditions. Getting this balance correct prevents root damage and frost.
Potted Hydrangeas
- Frequency: Monthly moisture checks during dormancy
- Amount: 2 cups per gallon of pot size
- Rule: Water only when soil is dry 2 inches deep
Ground Planted Hydrangeas
- Critical Timing: Deep watering before first freeze
- Technique: Slow soaking to 12 inch depth
- Caution: No watering during freezing temperatures
Temperature Considerations
- Minimum: Water only above 40°F (4°C)
- Timing: Midday watering allows drainage
- Monitoring: Use soil thermometer for accuracy
Inspect potted plants monthly by using the finger test. Stick your finger down to the second knuckle, and check for moisture on your finger. Water only when the soil feels dry, and use a measured amount of water for each vessel. I use a designated cup for this measurement to help with accuracy while preventing root rot. This method of treatment actually saved my patio hydrangeas in California during a dry winter.
Water the garden hydrangeas well before the first hard freeze. Water slowly until moisture reaches about 12 inches deep. This provides an insulation layer against root freeze. I choose the late fall time frame when the soil is still workable yet the temperatures are dropping steadily.
Refrain from irrigating in freezing conditions. Water expands as it freezes, destroying root cells. I pay attention to forecasts and will skip a scheduled watering if the air temperature drops below 35°F. I monitor the weather to avoid ice forming, which broke apart the roots of my young plants last winter.
Accurate water measurement is key for container plants, leverage cups per gallon to ensure consistent moisture without saturation. I marked one of my watering cans for winter. Measuring allows the plant to avoid drought or root rot.
Watering times for midday when temperatures are highest. This will allow time for excess moisture to drain off before temperatures fall below freezing overnight. I water in winter between 10 am and 2 pm. That timing will help protect the plant's roots from temperature shock.
Read the full article: Essential Hydrangea Winter Care Guide
