Why Do Plants Sweat? Here’s why and what you can do

Plant leaf Sweating

It’s not always dew when water drops appear on plant leaves in the morning. Plants perspire, which results in some water droplets. Plants sweat for a variety of reasons that help with cooling, much like people do.

Transpiration, or the flow of water from the plant to the leaves, is what makes plants sweat. The production of water droplets from the pores of the leaves, also known as plant sweat or guttation, serves as a cooling mechanism. Heat is evacuated from the leaves when the water vaporizes, creating a cooling effect.

We shall discuss why plants perspire and whether this is normal in this post. We’ll also go through some efficient ways to raise the humidity level around your indoor plants so they stay healthy all year long.

What Causes Indoor Plants To Sweat? 

What Causes Indoor Plants To Sweat? 

Transpiration and guttation, two processes that occur naturally in plants, can make your plants perspire (drop water).

Water that has been absorbed from the soil is lost through transpiration as water vapour.

The extra water and minerals are lost as droplets during guttation, though. Your plant appears to be perspiring due to both guttation and transpiration.


Indoor plants are a terrific method to raise the temperature and humidity in a space, get rid of air pollutants, clean the air, cut down on dust, and reduce carbon dioxide.

The photosynthesis and respiration processes of indoor plants are not the only ones responsible for these beneficial effects.

Transpiration, which involves moving water from the root to the shoot and leaves, is another important factor in improving the interior environment.

As is common knowledge, plants’ roots are in charge of drawing the necessary amounts of water and nutrients from the soil. Your indoor plants’ roots absorb water from the ground through osmosis.

The phloem carries nutrients and minerals to the various portions of plants. While extra water is carried by the xylem of plants to their aerial portions (stems, petioles, leaves, flowers, etc.).

All day long, plants continue to extract available water from the soil. However, not all of the water that plants draw up from the soil is utilized by them.

The plants only use a little portion of the water that has been absorbed. Just like people, plants perspire to release extra water.

Transpiration is the term for this process of evaporating extra water.

The additional water evaporates into the atmosphere as water vapor. Plants are useful for regulating humidity indoors because of this natural function.

By misting your plant, you can increase the humidity around it and water it sparingly without risking the negative effects of overwatering. You might try this misting bottle from Amazon, which is reasonably priced, reliable, and effective.

Does Transpiration Also Occur at Night?

Even at night, you could see your plant dripping water or perspiring. Most individuals worry because they believe that plants only transpire during the day. However, it is not entirely accurate.

The prevalent belief that transpiration does not take place at night is untrue, say Todd E. Dawson, professor of plant ecology and physiology, and Louis Santiago, professor of botany and plant sciences, both from the University of California.

In their research report, Drs. Todd E. Dawson and Louis Santiago offered compelling evidence that certain plants continue to transpire even at night.

As a result of the incomplete closure of leaf stomata, water vapor can still escape from the leaf.

According to Dr. Todd E. Dawson, overnight transpiration may increase carbon fixation in plants during the early hours of daylight because the stomata are already open and photosynthesis in plants can begin as soon as the sunrises. Using Google Scholar

Dr. Dawson added that many plant species, including indoor plants, frequently transpire at night. A considerable portion of the daily and yearly water requirement of plants may also be specified by nighttime transpiration.

Low-light indoor plants frequently transpire at night because they primarily rely on sun flecks for the process of photosynthesis from low-light situations that rely on sun flecks for photosynthesis.

Therefore, if your plant starts to sweat or start to shed water at night, don’t get alarmed because this is a fully normal procedure.

What Factors Can Increase Sweating (Transpiration) in Plants?

Temperature, humidity, vapor pressure deficit (VPD), strong winds, radiation, light, plant type, and other internal elements all affect how well or quickly plants transpire.

Both abiotic and biotic factors have the potential to influence transpiration rate.


In a leaf, the gaps between the cells are often filled with water vapor. Water vapors in the gaps between cells diffuse more quickly out of the leaf when the air around the plant is dry.

If the air around the plant is dry, the rate of transpiration will rise.

However, the transpiration rate will decrease if the air around the plant is damp or humid. In comparison to when it is placed in an area with a detectable level of humidity, your plant will sweat (drop water) more in a less humid environment.


The humidity level around your plant can be dramatically raised by using a humidifier.

Amazon’s Geniani portable humidifier offers the perfect level of ambient humidity for strong plant development. Clicking here will take you there.


Evaporation is a prerequisite for transpiration. The rate of evaporation will increase as the ambient temperature rises.

The rate of transpiration will consequently accelerate.

If the temperature of the leaf is high, your plant will also sweat more to lower its internal temperature.

The rate of transpiration is substantially influenced by both the interior and outside temperatures.


Moving your plant to a location where it is not directly exposed to sunlight is the straightforward answer to this problem.

The plant may also reflect heat if it is near a wall being illuminated by light. Moving the plant will be beneficial in this situation.

Strong Wind

The process of transpiration makes the air around the leaves damp or moist when the air around the plant is quiet.

The air becomes more humid as a result of the water vapor buildup.

The transpiration rate will rise to moisten the outside air if it’s dry, as we explained before in the essay.

The damp or moist air that surrounds the leaves is similarly blown away on windy days, removing the humid air and leaving behind the dry air.

To restore moisture to the air surrounding the leaf, the plants will accelerate transpiration.

The rate of transpiration will increase as the wind speed increases.

To the contrary, if there is a lot of wind close to the leaves, the guard cells may lose too much water, causing the leaf stomata to close. On dry, windy days, your plant may perspire more or drip more water.


High winds can dramatically reduce humidity, which can be harmful to plants near windows and doors as well as outside in the yard. Reduced moisture loss to the wind will result by moving the plant to a less windy location.


The size of the stomatal holes in the leaves can be considerably influenced by light, which has an impact on the rate of transpiration.

The stomatal aperture may close entirely or partially at night or in shade, which lowers the rate of transpiration.

On the other hand, a bright sunny day causes the stomatal opening on the leaf to open wide, speeding up transpiration.

Additionally, during hot weather, water vapor quickly flows outward, chilling the leaves, to lessen the heat from the plant. This also protects the plants from the sun’s harsh, hot rays scorching them.

It’s possible that your plant is perspiring more to expel internal heat and guard against sunburn on its leaves.


If your plant is outdoors, try to give it some shade by planting it near bigger plants or transferring it to a spot where it won’t be exposed to direct sunshine.

In these situations, indirect sunlight is preferable. See our article on where to keep plants safely in your house.

You can use this affordable grow light from Amazon if you think your plants aren’t getting enough light.

It’s important to give balanced illumination, and we’ve located a reliable artificial grow light on Amazon that does the job by offering the proper spectrum of light. Clicking here will take you there.

Transpiration Vs. Guttation:

Your plant may sweat or drip water as a result of both guttation and transpiration. However, these two natural events are not the same.

To help you better grasp how transpiration and guttation differ from one another, we’ve created the table below.

Water vapors generated from the soil’s absorbed water are expelled during transpiration.Droplets of extra water, minerals, and salt are expelled during guttation.
Only pure water evaporates into the atmosphere during transpiration.The removed droplets from guttation also include a variety of minerals and salts with the water.
Three aerial elements of the plant—the stomata openings, the lenticels on the shoots, and the cuticles—are used by the plant to lose water during transpiration.During guttation, droplets are expelled by hydathodes, or pores, that are located at the vein ends.
The turgidity of the leaf can be severely impacted by transpiration, causing the leaves to wilt.Guttation doesn’t seem to have any impact on how turgid the leaves are.
The stomata’s guard cells are in charge of controlling stomatal transpiration.Hydathodes, or pores, can open and close, but this cannot be controlled.
Transpiration typically takes place in the daylight, under the influence of sunlight.On the other hand, guttation typically takes place at night or in the early morning.

Is Sweating a Good Thing?

A plant cannot be harmed by sweating or guttation, and it does not imply that the plant is under any kind of stress. Water droplets accumulate on the leaves of plants during the natural process of transpiration or guttation, creating the appearance that the plant is perspiring.

As humans perspire to regulate their internal body temperature, plants can use transpiration to assist them sweat out heat.

Heat is also lost from the surrounding air when the water vapors evaporate into the outer air, increasing the humidity or moisture content of the atmosphere.

This creates cooler or more humid habitats for plants.

Guttation-induced sweating can aid plants in removing any extra minerals in the form of droplets or reducing salt stress.

As a result, sweating may benefit a plant’s general health and growth. However, excessive sweating might cause the leaf to wilt and lose its turgidity.

How to Increase Humidity around Indoor Plants

In their natural habitats, tropical plants are typically exposed to humidity levels of 88 percent, but the typical houseplant needs humidity levels between 30 and 40 percent.

Misting makes the area around the plant more humid. Despite the fact that some contend that this is only temporary. Humidity has the overall effect of facilitating a plant’s ability to absorb water.

Other elements including the season, wind, and equipment like air conditioners, radiators, and fans can also have an impact on interior humidity.

What does humidity mean in reality, as defined by the National Geographic dictionary

The amount of water vapor in the air is known as humidity. The humidity will be high if there is a lot of water vapor in the atmosphere. It feels wetter outside as the humidity rises.

Relative humidity is typically used to explain humidity. The percentage of the maximum quantity of water vapor the air can retain at a given temperature that is actually in the air is known as relative humidity.

It is not practical to replicate the entire tropical climate for plants because the extreme humidity can lead to the growth of mildew and fungus inside of our homes, which can lead to serious health issues.

By sprinkling the area around the plant or using a humidifier, we can, nevertheless, temporarily raise the relative humidity there.

For more information on the advantages of misting plants, visit our post on how to spray plants properly.

Amazon’s Geniani portable humidifier offers the perfect level of ambient humidity for strong plant development. Clicking here will take you there.


What causes plants to sweat?

Transpiration, or the flow of water from the plant to the leaves, is what makes plants sweat. The production of water droplets from the pores of the leaves, also known as plant sweat or guttation, serves as a cooling mechanism.

Why is my plant crying?

Guttation is the process by which leaves lose water as a liquid phase through unique cells called hydathodes. The different salts, sugars, and other organic compounds found in these guttation “tears” are present near the leaf margins or tips.

What does it mean when a plant is crying?

Plants have the ability to chemically call their roots for assistance when they are hurt. Scientists have discovered that when a plant is being attacked by a pathogen, such as bacteria that cause disease, the leaves can send out an S.O.S. to the roots for assistance, and the roots will then release an acid that attracts good bacteria to the plant’s aid.

Why is my indoor plant crying?

Because they have absorbed all of the moisture they can hold, the leaves are pouring as a result. Most plants won’t require as much water during humid periods as they normally would. Use your plants as a guide and change how much water you are giving them accordingly.

What does it mean when your plant is sweating?

When plants and trees “sweat,” they cool off and can also chill the air around them. Transpiration is the process by which plant roots remove water and nutrients from the earth and transfer them to the stem and leaves for photosynthesis.