How Do I Keep Houseplants Alive During a UK Heatwave?
Simple ways to protect your indoor plants during periods of hot weather in the UK.
Hot weather can be stressful for houseplants, especially when indoor temperatures climb into the high 20s or 30s. Drooping, yellowing or crispy leaves do not always mean your plant needs more water — sometimes they simply need a cooler environment and the right conditions around their roots.
Important
During hot weather, always check the soil before watering. Many common plant problems during heatwaves are caused by overwatering rather than underwatering.
1. Move plants out of direct afternoon sun
Bright light is beneficial for many houseplants, but direct afternoon sun through glass can quickly scorch leaves. If your plants receive several hours of direct sun, move them slightly back from the window or use a sheer curtain during the hottest part of the day.
2. Move plants away from hot windowsills
Windowsills can become surprisingly hot during summer afternoons. If leaves feel warm to the touch, move your plant further into the room until temperatures drop.
3. Don't water just because it's hot
Some pots dry faster during hot weather, while others remain wet for much longer than expected. Always check the soil several centimetres below the surface before watering rather than sticking to a schedule.
4. Check smaller pots more frequently
Plants growing in smaller pots dry out much faster than those in larger containers. During hot weather, monitor smaller plants more closely as they may need watering sooner.
5. Keep air circulating
Good airflow helps prevent hot, stagnant air building up around plants. Open windows when outdoor temperatures are lower or use a fan nearby, but avoid blowing air directly onto foliage.
6. Increase humidity carefully
Heatwaves can reduce indoor humidity levels. Grouping plants together or placing them near trays of water can help increase humidity naturally. Avoid misting plants in direct sunlight.
7. Avoid repotting or fertilising during extreme heat
Repotting and fertilising both add additional stress to plants. Unless there is an urgent issue, wait until temperatures have cooled before making major changes.
8. Protect newly purchased or recently repotted plants
Plants that have recently been brought home or repotted are already adapting to a new environment. Keep them out of direct sun and avoid further disturbance during hot weather.
9. Watch for signs of heat stress
Wilting, curled leaves, crispy edges and yellowing can all occur during periods of high temperatures. These symptoms do not always mean your plant needs more water — they are often simply signs that the plant is trying to conserve moisture.
10. Make sure pots drain freely
Heat combined with poor drainage can quickly lead to problems. Ensure pots have drainage holes and are never left standing in water. Well-aerated, free-draining soil allows roots to breathe and reduces the risk of root rot.
Helpful During Hot Weather
If soil stays wet for days, dries out too quickly, or you're seeing yellow leaves, drooping or fungus gnats, the problem may be the potting mix rather than your watering routine. A chunky, free-draining mix helps improve airflow around roots.
Shop Aroid MixShould I move my houseplants during a heatwave?
In many cases, yes. Moving plants a short distance away from sunny windows, radiators or conservatories can significantly reduce heat stress while still providing enough light for healthy growth.
Will my plants recover after a heatwave?
Most houseplants recover well once temperatures return to normal. Remove severely damaged leaves only after the plant has stabilised and continue caring for it as normal.
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