How to Water Geraniums Correctly

Overwatering kills far more geraniums than underwatering. These plants evolved in dry, well-drained environments and are built to withstand periods of drought — but their roots rot quickly in waterlogged compost. Getting the watering rhythm right is the single most important thing you can do for container-grown pelargoniums.

How often to water

There is no single answer to how often to water — it depends on pot size, compost type, temperature, weather, and time of year. The reliable method is to check the compost rather than water to a schedule. Push your finger 2–3cm into the compost: if it still feels damp or cool, wait. If it feels dry and the compost has pulled away slightly from the edges of the pot, it's time to water. In summer this might mean watering every one to three days; in autumn and winter, once every week or two is often sufficient.

How to water correctly

When you do water, water thoroughly — pour water slowly until it runs freely from the drainage holes in the base of the pot. This ensures the entire root zone is moistened, not just the top layer. Then allow the pot to drain completely before putting it back on a saucer. Do not leave pots sitting in saucers of water, as this keeps the base of the compost permanently wet and encourages root rot.

• Check compost moisture with your finger before watering.
• Water thoroughly until it drains from the base.
• Empty saucers after watering — never sit pots in standing water.
• Reduce watering significantly in autumn and winter.

Watering in summer heat

In hot weather, particularly for plants in hanging baskets or small containers, you may need to water once or even twice daily. Small pots and baskets have less compost volume and dry out extremely quickly in heat and wind. Adding water-retaining gel granules to the compost when potting can help extend the time between waterings. Terracotta pots dry out faster than plastic — factor this in when choosing containers.

Watering during winter dormancy

Overwintered pelargoniums need minimal water. In a cool, frost-free location, they rest and grow very slowly — the risk of overwatering is much higher than in summer. Water only when the compost has been dry for several days, and then only sparingly. Soggy compost in a cool winter environment is the fastest route to rotting stems and root rot. Resume normal watering gradually as temperatures rise and growth picks up in late winter and spring.