Summer in Ukraine has been getting hotter in recent years. Temperatures inside apartments and houses often rise above +30°C, while dry air and harsh sunlight create real stress for indoor plants. Some green favourites adapt to heat quite well, but others find the summer months extremely challenging. If you do not notice the problem in time, the plant may start dropping leaves, turning yellow, or even dying.
In this article, we will look at which houseplants struggle most with summer heat in Ukraine, why it happens, and how to help them survive the hot season without damage.
Why Summer Heat Is Dangerous for Houseplants
Many people think plants love warmth. That is partly true, but there is a big difference between comfortable warmth and exhausting heat. In their natural environment, many indoor plants grow in tropical forests, where the temperature is stable and humidity is high. Ukrainian summers indoors are very different: dry air, hot windowsills, drafts from air conditioners, and overheated soil.
During hot weather, plants lose moisture much faster. The roots cannot replace the lost water quickly enough, and the leaves begin to dry around the edges. Direct sunlight through glass is especially dangerous. A window can work almost like a magnifying glass, so even light-loving plants may get burned.
Another problem is an overheated pot. Dark plastic or ceramic pots can become so hot in the sun that the roots practically “cook”. Because of this, a plant may look wilted even after watering.
Orchids Are Among the Most Heat-Sensitive Plants
Why Orchids Suffer in Summer
Orchids, especially Phalaenopsis, are very popular in Ukrainian homes. But they are often among the first plants to react badly to summer heat. In nature, these plants grow in humid jungles with good air circulation. In an apartment, hot air near the window becomes a serious problem for them.
When an orchid overheats, its leaves become soft, lose firmness, and the roots dry out even if the substrate still feels moist. If the temperature stays above +30°C for a long time, the plant may stop blooming or drop its buds.
How to Help an Orchid in Hot Weather
The best solution is to move the orchid away from a south-facing windowsill. Even placing it one metre away from the window can significantly lower the temperature around the plant. Light shading with a curtain or blinds also works well.
It is important to maintain air humidity. You can use:
a humidifier;
a tray with wet expanded clay;
regular ventilation without hot drafts.
It is best to water orchids in the morning, so extra moisture has time to evaporate by the evening.
African Violets React Very Badly to Overheating
Why Saintpaulias Are Afraid of High Temperatures
African violets, or Saintpaulias, may seem easy to care for, but heat is extremely dangerous for them. The ideal temperature for these plants is around +20–24°C. When the temperature rises above +28°C, violets begin to lose their decorative appearance.
The leaves become weak, the flowers get smaller, and the soil can dry out in just one day. Hot air at night is especially harmful because the plant cannot recover properly.
How to Save an African Violet in Summer
Violets should be moved to the coolest place in the apartment. East-facing windows or rooms without direct sunlight are ideal. Experienced plant lovers often place Saintpaulias on lower shelves during hot periods.
Another important point is proper watering. In hot weather, you should not overwater violets because the roots can quickly rot in warm, wet soil. Watering should be moderate but regular.
Calathea Does Not Like Dry Air
The Main Summer Problem for Calathea
Calathea is loved for its beautiful decorative leaves, but it is also one of the most demanding houseplants. In summer, its biggest enemies are dry air and high temperatures.
In hot weather, the leaf edges dry quickly, brown spots appear, and the leaf pattern loses its brightness. If the air is too dry, Calathea may curl its leaves to reduce moisture loss.
How to Create Comfortable Conditions
Calathea needs stable humidity of at least 60%. In a regular apartment during summer, this level often drops to 30–40%.
Helpful options include:
Method
Effectiveness
Humidifier
High
Tray with water
Medium
Misting
Temporary
Grouping plants together
Good
It is also important not to place Calathea near an air conditioner. A cold air stream causes even more stress.
Azalea Almost Cannot Tolerate Ukrainian Summer
Why Azalea Suffers the Most
Azalea is one of the most difficult indoor plants to keep healthy in summer. It prefers cool conditions and feels best at +15–20°C. In many apartments, the temperature is much higher in summer, so the plant quickly loses strength.
The first signs of overheating include:
leaf drop;
dry buds;
yellow spots;
general wilting.
Azaleas have an especially hard time in apartments without air conditioning.
How to Cool an Azalea
Experienced plant lovers use a simple trick: they place ice or cold bottles of water near the pot. This temporarily lowers the temperature around the plant.
You can also move the azalea to a shaded balcony or the coolest room in the home. The main thing is to avoid direct sunlight.
Ferns Dry Out Quickly in Hot Weather
Why Ferns Lose Their Beauty
Most indoor ferns naturally grow in shady and very humid places. Ukrainian summer heat is unnatural for them. Because of dry air, fern leaves begin to dry out along the edges.
The most sensitive types include:
Nephrolepis;
Maidenhair fern;
Asplenium.
If the temperature stays high for a long time, the plant may completely lose its decorative look.
How to Help a Fern
Ferns love frequent misting and high humidity. However, it is important to use soft water at room temperature. Cold water during hot weather creates extra stress.
It is also useful to keep ferns away from direct sun and hot windowsills.
Common Summer Care Mistakes
Overwatering
Many people think that plants need constant watering during hot weather. In reality, this is one of the most common mistakes. In warm, wet soil, roots can begin to rot very quickly.
Watering in the Middle of the Day
Watering plants during the hottest part of the day is not recommended. Water evaporates quickly, and heated soil can damage the roots.
Sunlight Through Glass
Even plants that love bright light can get sunburned through window glass. This is especially common on south-facing windows.
How to Protect Houseplants from Summer Heat
Create the Right Microclimate
The most important thing for houseplants in summer is not only watering, but also the right microclimate. If the air is too dry, even regular soil moisture will not be enough.
Ideal conditions:
Parameter
Recommended Value
Temperature
+20–26°C
Humidity
50–70%
Lighting
Diffused light
Watering
Moderate
Use Natural Shading
Light curtains or roller blinds can significantly reduce the temperature near the window. This is a simple way to protect plants without extra costs.
Check the Leaves Regularly
Leaves are the main indicator of plant health. If the edges dry out or spots appear, it is worth changing the care conditions immediately.
Conclusion
Summer heat in Ukraine is becoming a real challenge for many houseplants. Orchids, African violets, Calatheas, Azaleas, and ferns struggle the most with high temperatures. The main problems are overheating, dry air, and incorrect watering.
To help plants get through summer comfortably, it is important to control temperature, humidity, and lighting. Sometimes, even simply moving the pot away from direct sun can save the plant. Careful attention and a quick reaction to the first signs of stress will help keep your indoor green corner healthy even on the hottest days.