Hydrangeas are loved for their large flowers, long flowering season and beautiful garden impact. Whether planted in containers on a terrace or growing in garden borders, proper watering is essential for healthy plants and continuous blooms.
Endless Summer® hydrangeas are reblooming hydrangeas that flower on both old and new wood, producing fresh flowers throughout the season. To support this continuous flowering, hydrangeas need consistent moisture – especially during warm summer weather.
In this guide, you’ll discover how to water hydrangeas correctly in pots and in the garden, how often to water them and how to recognise signs of underwatering or overwatering.
Do hydrangeas in pots need more water?
Yes. Hydrangeas grown in containers usually dry out faster than hydrangeas planted in the ground.
This happens because:
- containers hold less soil;
- roots have limited space;
- pots heat up more quickly in warm weather;
- water evaporates faster from container plantings.
Especially during summer, windy weather or heatwaves, container hydrangeas may require more frequent watering than garden hydrangeas.
Do hydrangeas in pots need more water?
The best way to know whether your hydrangea needs watering is by checking the soil.
Place your finger around 5–7 cm deep into the soil:
• if the soil feels moist, no watering is needed;
• if the soil feels dry, it is time to water thoroughly.
You can also look at the colour of the soil:
• wet soil is usually darker;
• dry soil appears lighter and dusty.
During the growing season, especially in warm weather, it is best to check hydrangeas daily.
How to water hydrangeas properly
When watering hydrangeas, always water deeply around the base of the plant rather than over the leaves and flowers.
Watering at the base helps:
• deliver moisture directly to the roots;
• reduce evaporation;
• minimise the risk of fungal and foliar diseases.
Give the soil a thorough soak until it feels evenly moist.
For hydrangeas planted in pots, continue watering until excess water drains from the bottom of the container.
When is the best time to water hydrangeas?
The best time to water hydrangeas is:
• early in the morning;
• or later in the evening.
This allows the water to soak into the roots before the hottest part of the day.
Avoid watering during intense midday sun, as water evaporates more quickly and plants can become stressed
Why do hydrangeas droop in hot weather?
Many mophead hydrangeas naturally droop during the hottest part of the day. This is known as flagging.
Although it can look alarming, temporary wilting during afternoon heat is often completely normal.
Before watering immediately, always check the soil first.
If the soil is still moist, your hydrangea is likely responding to heat rather than drought. Overwatering can be just as harmful as letting the soil become too dry.
Watering hydrangeas in pots vs in the ground
Although all hydrangeas enjoy consistent moisture, container hydrangeas and garden hydrangeas have slightly different watering needs.
Watering hydrangeas in pots
Hydrangeas in containers may need:
• more frequent watering;
• daily soil checks in summer;
• extra attention during windy or hot weather.
Choose containers with drainage holes and use high-quality potting compost to help regulate moisture levels.
Adding mulch to the top of the pot can also help reduce water evaporation.
Watering hydrangeas in the garden
Hydrangeas planted in borders usually retain moisture longer because their roots can spread deeper into the soil. However, garden hydrangeas still benefit from:
• regular watering during dry periods;
• mulch around the base of the plant;
• deep watering rather than light surface watering.
Newly planted hydrangeas especially require consistent watering while establishing roots.
Every hydrangea is different
No two hydrangeas are exactly the same. Water needs can vary depending on:
• plant size;
• age of the hydrangea;
• pot size;
• sun exposure;
• soil type;
• wind and temperature.
Checking the soil regularly is the best way to understand what your individual hydrangea needs. With the right care, Endless Summer® hydrangeas will reward you with healthy foliage and Non-Stop new blooms throughout the season.
Enjoy non-Stop flowers with Endless Summer®
Whether growing in pots, patios, terraces or garden borders, Endless Summer® hydrangeas bring long-lasting colour and repeat blooms throughout the season.
By understanding how and when to water your hydrangeas, you can help your plants stay healthy, vibrant and full of flowers from spring through to autumn.
FAQ about watering hydrangeas
Container hydrangeas may need watering daily during hot summer weather. Always check the soil before watering.
Yes. Overwatering can cause root problems and reduce plant health. Hydrangeas prefer consistently moist soil, not waterlogged conditions.
Spacing your plants depends on the variety and your desired look. If you’d like to create a hedge, plant a bit closer together. And if you like some delineation of lines between the plants, you can add a little breathing room. Each variety also has a different size at maturity, so you’ll want to keep that in mind. For example, Summer Crush® hydrangea matures to 18-36” wide, so you’ll want to plant them roughly 36” on center to give them enough room to breathe. Having space for airflow helps prevent any disease occurrence on the leaves.
It is best to water hydrangeas at the base of the plant to keep the foliage dry and reduce the risk of disease.