How To Lower Humidity In Grow Tent

How To Lower Humidity In Grow Tent Or Grow Room

Keeping the relative humidity under control may be a challenge for indoor growers, and it can occasionally lead to difficulties. Experienced indoor growers understand that maintaining the proper humidity level in your grow tent is important to the success of your indoor plant growing endeavors. If the humidity level in your grow tent is too high, learn how to control the humidity level in your grow tent. High humidity levels can cause delayed growth, bud rot, fungal development, mildew, and mold to appear on the leaves of plants.

The humidity level in your grow tent should not be more than 70%.

Don’t be concerned; the very items that you’ll find in your grow tent may be the solution to keeping the humidity level in your grow tent at an optimum level.

Understanding Relative Humidity

Let’s start with a little scientific lesson: humidity is defined as the amount of water vapor present in the air. At the same time, relative humidity may be defined as the relationship between present absolute humidity and the greatest potential absolute humidity. In layman’s words, relative humidity is the point at which the air becomes entirely saturated with water vapor and is no longer able to contain it any longer. Keep in mind that there will always be some amount of water vapor in the air.

Heat in a grow tent encourages water to travel more quickly through the air, resulting in a greater level of humidity in the environment.

Why High Humidity Is Bad And Causes Problems

So you’ve been informed that high humidity is essential for the strong development and health of your growing plants. Do you believe it? Humidity is extremely beneficial to plants. However, although this is true, overly high humidity levels in your grow tent might cause more harm than good to your plants. If you do not want your grow tent to do any of the following:

  • Bacteria and molds thrive in this environment, which is ideal for them. Allowing your floral plants to succumb to bud rot or botrytis Increase the hazard posed by pests and pathogens
  • Prevent your plants’ transpiration, or exchange of air, from occurring
  • Encourage the growth of undesirable microbiological organisms
  • Clog the stomata, reducing carbon dioxide intake, which is necessary for optimal photosynthesis to occur
  • Make the roots inactive by reducing their capacity to absorb water on their own own
  • Reduce the rate at which your plants absorb nutrients
  • Reduce the amount of produce produced by your plants.

Then it’s time to figure out how to keep the humidity levels in a grow tent as low as possible for the duration of the grow.

Importance Of Low Humidity In A Grow Tent

When it comes to humidity levels, it is important to remember that a low humidity environment in your grow tent may do wonders for your plant. Homogeneous conditions and moisture build-up in a grow tent might cause your flower or buds to get moldy and die. Other problems associated with excessive humidity include:

  • It is possible for white mold to irritate your leaves, preventing them from taking in water and oxygen, as well as light. Rust fungus: This fungus causes rust patches on the leaves of plants. Root rot occurs when the soil is excessively damp for an extended period of time.

Grow Tent Size

It is important to consider the size of your grow tent from the beginning since you must guarantee that all regions are covered by a reasonably low level of humidity in all places.

For example, a44 grow tent requires 40 percent of the total energy, but a55 grow tent requires at least 65 percent. My 4×4 grow tent can accommodate a home dehumidifier, thus a small dehumidifier that can absorb 8 to 10 ounces of moisture each day will enough for a 2×2 grow tent.

What’s the best grow room temperature?

Although temperature changes, it is necessary to provide you with an understanding of how to regulate humidity. Make certain that you have a thermometer and a hygrometer on hand. Clones or seedlings prefer temperatures between 74 and 78 degrees Fahrenheit, although vegging plants may live at temperatures as low as 70 degrees Fahrenheit. In order to flower, flowering plants require greater temperatures of 88-75 degrees Fahrenheit than plants ready to harvest, which can tolerate temperatures of 65-74 degrees Fahrenheit.

What’s The Best humidity level?

Plants flourish in a variety of humidity levels throughout their lives, at all stages of development. Seedlings or clones require 70 percent to 75 percent humidity because plants need time to grow their root systems, which forces them to rely on their leaves to absorb water until their root systems are fully developed. Having enough of moisture in the air is essential for feeding your newborn plants. It is for this reason that indoor producers employ propagation trays or humidity domes to accumulate moisture.

  • Flowering plants require 40 percent to 50 percent humidity in order to provide a pleasant environment for their leaves to breathe.
  • When it comes to indoor horticulture, humidity is a critical factor to consider.
  • In order to be successful as gardeners, we must be aware of the humidity levels that are appropriate for different phases of plant growth and different plant species.
  • Humidity, in conjunction with temperature and light, can assist producers in raising healthy, vigorous plants that produce abundantly and efficiently.

Here How To Lower Humidity In Grow Tent

According to everything I’ve said thus far about the importance of high humidity, it can also be harmful if the levels get excessively high. Here are some tried-and-true and simple methods that indoor gardeners have used to help minimize humidity in their grow tents:

1. Avoid overwatering your plants

Protecting your plants from overwatering is one of the most straightforward methods of lowering humidity levels. Overwatering results in more water being produced, which may result in a rise in humidity in your grow tent that is beyond the recommended amount. In the same way, damp soil will leave excess water in propagation trays, which will enhance the humidity levels in the same way.

2. Use a Dehumidifier Inside your Grow Tent

I’m confident that you’re familiar with our old acquaintance, the dehumidifier. When the air in your grow tent becomes too humid, a dehumidifier can assist to extract the excess moisture from the air, therefore decreasing the humidity levels. You will most likely have to spend more money on this because a grow tent will normally require the use of an industrial dehumidifier. We must make significant investments in resources in order to assure overall plant development and yields. If your site is already humid, I recommend that you use a high-quality dehumidifier that is connected to a drainage system.

If possible, your dehumidifier should be capable of eliminating at least the same amount of moisture from the air as your plants absorb on a regular basis.

Learn more about how to select the most appropriate dehumidifier for your grow tent.

Some dehumidifiers include an automated shut-off option that activates when the water reservoir is full.

Nonetheless, you may use a timer to keep track of how much water your dehumidifier is gathering. Therefore, the entrance and outflow of a humidifier are both located within your grow tent, which might result in the space becoming overheated.

3. Check your plant density

Naturally occurring carbon dioxide is released by plants, which causes the temperature in your grow tent to rise. As a result, moisture accumulates and the relative humidity rises. Increasing the amount of plants in your grow tent might cause the air in the tent to get displaced, preventing other regions from receiving fresh air and carbon dioxide. Continue reading to learn how to determine the optimal amount of plants that should be accommodated in your grow tent. Keep in mind that if your grow tent does not have adequate dehumidification and ventilation, the water vapor transpired by your plants will be retained.

4. Remove stagnant water

Remember how I said you didn’t have to spend a lot of money attempting to lower the humidity levels in a grow tent? Well, I was right. Here’s one of the most cost-effective strategies we can employ! As indoor producers, it is our job to ensure that our grow tents have adequate drainage so that stagnant water does not pool on the ground and contribute to excessive humidity. Water that has become stagnant has the disadvantage of reducing molecular oxygen concentrations to the point where bacteria may develop and flourish.

There’s nothing worse than having your grow tent turn into a breeding ground for bugs and pathogens.

5. Improve ventilation by adding more fans

In order to enhance ventilation in your grow tent, I propose adding extra exhaust fans or increasing the speed at which the fans rotate. Increasing the quantity of airflow in the grow tent is the most practical technique to assist raise the amount of oxygen available. Utilize an atmospheric controller with a humidity setting, if feasible, to automatically adjust the fan speed to achieve the desired level of humidity. Another option is to use a duct fan or open a window to force moisture out of the grow tent, which is a straightforward solution.

This form of ventilation will lower humidity levels since the positive pressure within the grow tent provides enough air movement to provide a mild breeze across the whole tent.

I should caution you against depending solely on oscillating wall fans to provide proper air circulation; these fans might fail to do so since they can only lessen the temperature on the canopy.

I now recommend that you purchase floor fans to draw air through the canopy and guarantee that carbon dioxide is distributed evenly.

Using a hygrometer controller to power fans is a dependable automation method, according to my experience. It is more efficient than using a thermostat or a timer since it boosts efficiency.

6. Create air holes

Making large or narrow openings in your grow tent might help you manage the flow of air in your growing environment. To reduce humidity, expand the openings in the ceiling to guarantee that more air enters than escapes from the ceiling. Take care not to allow any unnecessary light into the room.

7. Purchase an air conditioner

It is well-known that the primary function of an air conditioner is to chill the air and reduce humidity levels in the surrounding area. The gadget extracts heat from the air by compressing it and using gas to do so. In addition to generating condensation, this procedure eliminates moisture from the air in a highly efficient manner. Large air conditioning equipment, on the other hand, tend to operate on short cycles or for short periods of time, creating an unpredictable climate for your plants.

In addition, there is the issue of frequent variations, which can cause the temperature in your grow tent to skyrocket to dangerous levels.

This may also be used in conjunction with a fan to assist maintain a cool climate in your grow tent by minimizing the amount of water vapor produced.

It is important to remember to clean the filters since clogged filters hinder proper airflow, which causes the humidity to rise.

8. Insulate and seal your grow tent

When it comes to controlling humidity, one of the most important things to consider is making sure your grow tent is properly insulated and sealed. I construct a substantial barrier between the outside environment and my grow tent by insulating it with foam insulation. I am less concerned about my plants being threatened by external sources as a result of this.

9. Use grow equipment wisely

I’d like to caution you that grow equipment, such as grow lights, might cause the temperature in your grow tent to rise significantly. Consider purchasing a grow lamp that does not produce a lot of heat. If the temperature in your grow tent is too high, switch off the lights to let the temperature to decrease. Allowing your lights to go to sleep can also help you save money on your power bills.

10. Make use of absorbent soil

As indoor gardeners, we need to be aware with the many types of soil that are acceptable for our plants’ needs. Utilizing soil that has the ability to retain water underneath a grow tent is essential for lowering humidity levels. I recommend that you use sandy soil to reduce evaporation rates and the amount of water that is exposed to the sun. Alternatively, perlite is an option, although sandy soil is less expensive—a nice reminder to replace the soil on a regular basis.

I’ve also noticed that utilizing lime or baking soda offers the same benefits as using sandy soil when it comes to growing vegetables. As a general guideline, stay away from any substance or soil that has the potential to retain moisture. Always choose surfaces that are absorbent.

11. Consider defoliating your plants

Another option that is more cost-effective is presented below. Plants with large leaves, such as leafy plants or plants with large leaves, might cause the humidity levels in your grow tent to rise. I normally try to reduce the amount of humidity in the air by removing some leaves from the trees.

See also:  How To Waterproof A New Tent

To sum it up…

Indoor producers must keep track of both humidity levels and temperature readings, as well as the relationship between the two. We will be able to better understand how environmental conditions influence the development and survival of our plants in this manner. Generally speaking, plants will have a difficult time transpiring if both humidity levels and temperature levels are high. As a result, growth and development are slowed significantly. Furthermore, ventilation is one of the most important factors affecting humidity levels in a grow tent.

  • To maintain high-quality growth and increased yields, it is necessary to keep humidity levels under control.
  • Remember, first and foremost, you must comprehend the contextual conditions.
  • Alternatively, if this is not practicable, there are low-cost alternatives such as the use of exhaust fans, a hygrometer controller, monitoring ventilation, or managing plant density.
  • If you use appropriate gardening tools and maintain adequate ventilation while keeping relative humidity levels low for your plants, they will appreciate you.
  • She contributes to a variety of online media and websites.
  • With significant expertise in both hydroponics and aquaponics, she is well-versed in the art of indoor growing.

How to Lower Humidity in Grow Tent When It’s too High

Home»Environment» The best way to lower the humidity in a grow tent when the humidity is too high 19187Views0 Humidity may be both a benefit and a disaster for an indoor grow system, depending on the situation. Just as with temperature, humidity has a significant impact on the quality and quantity of your indoor gardening harvest when it comes to quality and production. After everything is said and done, when the humidity in the grow tent rises to dangerous levels, it might result in the worst nightmare for a grower.

We hope you are not one of those people who would later come to regret spending all of their money, time, and effort because they were unable to deal with a scenario like this.

We’ve included both short-term and long-term solutions, as well as a list of causes that might result in damp air in the first place. Maintain your focus till the conclusion.

Why? Why? Why?

As a result, we’ve created a circumstance in which there is an excessive amount of humidity in the grow tent. The entire affair, on the other hand, did not happen out of nowhere. It must have had some cause for the high Rh level, and recognizing those reasons is critical to figuring out how to get the Rh level back down. Agreed? The following is a list of possible suspects:

Increased Transpiration

The size of a plant’s leaves increases in proportion to the size of the plant. Furthermore, it is a fundamental principle of botany that bigger leaves release more vapor into the atmosphere. In the event that you do not adjust your ventilation system to the appropriate level, the humidity will rise instantly. This might also happen if you suddenly increase the number of plants in a container or garden.

Open Water Surfaces

The size of a plant’s leaves increases in proportion to its size. Furthermore, it is a basic principle of botany that bigger leaves release more vapor into the atmosphere. Unless you keep your ventilation system operating at peak performance, the humidity will rapidly increase. Additionally, if you suddenly increase the number of plants in your garden, this may occur.

Too Humid Outside Environment

The average humidity in Alaska is 77.1 percent, whereas the average humidity in Florida is 74.5 percent. The list goes on with the states of Louisiana, Mississippi, Hawaii, Michigan, and so on and so on. (The whole report may be seen here.) This discusses in great detail why growing in a grow room in these types of environments is difficult. Any small crack or leak in the insulation system between the grow room and the outside environment may result in a sudden and unexpected increase in the relative humidity.


The soil will get soggy as a result of overwatering the plants, which will also push the leaves of the plants to release more vapor into the air. Both damp soil and over-transpiring plant leaves have the potential to make the environment inside the grow tent uncomfortably humid.

High Humidity is Bad, Here’s Why-

A lack of humidity in a grow room can have a variety of negative consequences for the plants. However, having too much of it is not a good thing. When your grow environment becomes overly humid, here are some immediate results:

  • A lack of humidity in a grow room can have a lot of negative consequences. However, having too much of it isn’t a good thing. When your grow environment becomes excessively humid, here are some rapid results:

How High is ‘Too High’ for Grow Room Humidity?

As we all know, the degree of humidity fluctuates from one development stage to the next. As a result, it is not possible to designate a definite “Rh Percentage” as a distinguishing factor between an optimal and an excessively high humidity level. However, the general rule of thumb is that the entire range of humidity in a grow room should be less than 60%. A rise in the relative humidity level above 60% can cause a number of crop-related problems, as we described in detail in the preceding section of this article.

The Correct Humidity Levels for Different Grow Stages

The plant’s roots begin to develop at this stage and will continue to grow for a while.

As a result, a high amount of humidity is required. Humidity domes are frequently used to raise the relative humidity (RH) of the approaching air above the plants.

Vegetation: Rh 40-60%

Because growing plant leaves need a sufficient amount of water in the air, the humidity level must be elevated. Additionally, a percentage of the water intake is accomplished through the roots of the plants. However, because they haven’t fully formed yet, leaves must continue to take in water.

Flowering: Rh 35-50%

This is the point at which high Rh begins to manifest itself in negative ways. As a result, it is critical that the humidity does not rise from this point on. Molds, rotting buds, and other unpleasant things will begin to appear if this is not done. To ensure that the flowering stage begins successfully, the relative humidity should be maintained between 40 and 50 percent. However, after the buds begin to produce a crop, farmers reduce the percentage to 35-40 percent. And this must be done gradually, so that there is no significant, rapid decline in the Rh.

Harvesting/Drying: 30-40%

Crops begin to dry at this point, which leads to the harvesting of the crop. However, we must maintain a humidity level of 30-40 percent in order to prevent the buds from drying out too quickly. Some growers prefer to maintain a little higher humidity level (50 percent) in order to allow their buds to dry more slowly. This, in any case, enhances the overall quality of the cured buds.

Germination/Cloning Vegetation Flowering Harvesting/Drying
75-85% Rh 40-60% Rh 35-50% Rh 30-40% Rh

How to Decrease Humidity in Grow Tent/Room?

Crops begin to dry at this point, which leads to harvest. In order to avoid drying out the buds too quickly, we must maintain a humidity level of 30-40 percent. In order to allow his buds to dry more slowly, some growers choose to keep the humidity at a little higher level (50 percent). The quality of the cured buds will be improved in any case.

Use A Dehumidifier

It should go without saying that in order to reduce humidity, you will need to rely on our trusted ally, the grow room dehumidifier. Prior to purchasing a dehumidifier, take a moment to consider the appropriate size for your grow room layout before making your purchase. So, what exactly qualifies as a decent dehumidifier that can remove the exact amount of humidity that you require? Some points to think about are listed below.

  1. Dehumidifying capacity is critical, and it should match the requirements of your grow system exactly. According to the manufacturer, it is intended to absorb and expel the same quantity of vapor that your plants exhale via their leaves. There is a limit to how much may be held in a pint
  2. You should check to see that your dehumidifier can be connected to your drainage system if you live in a humid climate. It should have a water tank that is enough in size. It should be equipped with an automated timer or an automatic shut off mechanism (when the tank is completely full)
  3. It should be considerate of the power bills’ budget.

Once you’ve selected the appropriate size dehumidifier, you’ll need to ensure that it is installed in the proper location. Also, avoid connecting these dehumidifiers to electrical extension cords if at all possible. The following is our preferred dehumidifier for the grow room: GDM30 from Ivation The following is our preferred dehumidifier for the grow room: hOmeLabs Dehumidifier for 1,500 square feet that is Energy Star rated

Use An Air Conditioner

Knowing that the temperature and humidity of a grow room are intertwined is not a surprise. When the temperature rises, the capacity of the air to contain water vapor increases as well, and you will see a direct increase in the Rh levels in your room. As a result of decreasing the temperature, you will be able to eliminate a significant amount of humidity from your grow tent or growing environment.

Having said that, selecting the appropriate size of air conditioning units is critical. Otherwise, it will either result in condensation or will be unable to maintain control over the temperature and humidity levels in the room. More information about this may be found later in this page.

Passive Ways

When it comes to smaller grow systems, such as 44, 55, and 88 grow tents, utilizing a dehumidifier or air conditioner is not a suitable alternative for reducing humidity. Fortunately, there are a number of passive solutions that are effective in dealing with this problem in indoor grow systems. We’ve compiled a list of three actionable passive methods for accomplishing this. Take a look at this-

Boost the Ventilation Up

When it comes to passive methods of decreasing the humidity level, increasing air circulation is at the top of the priority list. One of the primary reasons of excessive humidity buildup in your grow room is the failure to properly vent damp air out at a sufficient rate. Simply said, substituting the humid air for fresh, ambient outside air will lower the Rh percentage by a significant amount. In the event that you find yourself in a high humidity condition, the following steps should be taken to improve ventilation:

  • Increase the size of your intake hole or make a new one. This will allow for more air to enter the room while also increasing the efficiency of an exhaust fan. If you want to utilize an intake fan instead of holes, increase the power (CFM) of the fan. Instead of simply employing oscillating wall fans to circulate air around the grow room, adding floor fans as air circulators throughout the grow room is a good option. These fans have the ability to draw air through the plant canopy, ensuring a proper interchange of old, humid air with new, dry air. Make use of an atmospheric controller that has humidity settings to reduce the risk of fire. It will automatically adjust the exhaust/inlet fan speed in accordance with the relative humidity in the room
  • And In responsible of removing the humid air should be inline fans. Make certain that the fan is strong enough and has the same diameter as your ducting, which is more critical. Keep a watch out for how effectively this buzzy thing is at reducing its noise level

Use A Thermostatically Controlled Block Heater

Do you have a high level of humidity in your grow tent at night? Increases in Rh levels and condensation are more likely to occur during the dark hours as opposed to the light hours, according to research. The temperature decreases as soon as the lights are turned off. When the temperature drops sufficiently, moisture will begin to accumulate around the lights, which is referred to as humidity fluctuation in this context. Remedy? When the lights in your grow room are turned off, use a thermostatically controlled block heater to keep the temperature near to the level when the lights are turned on.

Defoliate the Plant Leaves

We’ve already noted that when plant leaves develop in size, they become a more significant source of water transpiration into the surrounding atmosphere. Result? The humidity in the grow chamber rises quickly. You can defoliate some of the exceptionally huge plant leaves as a passive solution for bringing the humidity level in the grow tent down. Whenever you are removing leaves, make sure to leave enough for the plants to continue their usual operations, such as photosynthesis. By comparison, it is a relatively inexpensive method of lowering humidity in grow tentas that works fairly well.

See also:  How To Keep A Tent Cool At Night

Things to Do to Avoid Further Raise in Humidity

What can I do to permanently reduce the humidity in my grow tent? Here are some steps you may do to keep the humidity in your ingrow tent from rising any further:

Don’t Depend on One-dimensional Ventilation

One of the fundamentals of humidity control is that, if appropriate ventilation is provided throughout the grow room, the air will never get saturated with water vapor. The oscillating fans alone will not be sufficient to ensure that this occurs. Because they can only lower the temperature of the plant canopy, they are not very effective. So, what is the best way to create a multi-dimensional ventilation system? As a result, here are some recommendations: –

  1. If you’re growing in a tent, make sure there are many intake holes. In the event of a room, source air should be provided by more than one intake fan. Maintain appropriate air circulation across the plant canopy, including the bottom (with floor fans) and top (with wall-mounted oscillating fans) sections. Allowing the CO2-rich, heavy air to accumulate on the floor is not recommended.

Deduce Exposed Water Surfaces

It’s a very easy and inexpensive hack to do, but it turns out to be really successful in terms of lowering the humidity in the grow room.

And that is to determine whether or not there are any exposed water surfaces in the grow chamber. How did these open water surfaces get there in the first place?

  1. Water that is stagnant yet does not puddle on the ground
  2. Reservoirs for water

To deal with the first, you must make certain that a sufficient drainage system is in place throughout the whole grow system. For the second, just place covers over each and every water reservoir you have in the room to bring the situation to a close.

Insulate Your Grow Space from Outside Humidity

First and foremost, ensuring that a sufficient drainage system is in place across the whole growing environment. And to bring the second one to a close, just place covers over each and every water reservoir in the room.

Use Soil That Absorbs Vapor

The use of soil that can absorb water and retain the Rh beneath the grow tent can be a useful step in eliminating humidity in the grow tent. Sandal soil is an excellent example of this type of soil. Make certain, however, that your plants will not have any difficulties growing in such mediums.

Use The Right Size of AC Units

Both big and undersized air conditioning systems have the potential to cause an increase in temperature and humidity. With large air conditioning machines, the dead band is quite brief, resulting in an increase in humidity in the surrounding air. And, on the other side, small air conditioning systems cause wilting, which is a concern for indoor plants. One of the factors that might cause a troublesome environment for the plants is a high degree of humidity. What’s the gist of it? Always make sure that the air conditioning units are the proper size so that they can operate consistently for the greatest amount of time.

Keep an Eye on Your Humidity Level

Using this method does not constitute a ‘prevention’ to lower humidity in a grow tent. However, by utilizing a hygrometer, you can keep track of the exact humidity level that your tent or room is experiencing. In the market, there are thermometer-hygrometer combos that may be purchased. You can kill two birds with one stone if you have one of them hanging on the wall of your grow tent. To ensure that the humidity in your grow tent does not get too high, here are some of our favorite digital thermometer-hygrometer combos.

  1. ThermoPro TP65 Digital Wireless Hygrometer
  2. AcuRite 00613 Indoor ThermometerHygrometer
  3. ThermoPro TP65 Digital Wireless Hygrometer

I’m Saleh, and I’m a blogger that enjoys doing home improvement projects on the side. is my little corner of the internet where I can express what I’ve learned first-hand, particularly in the field of home improvement. The most recent posts by smsaleh (see all)

How To Lower Humidity In A Grow Tent (Without Spending A Ton)

Plant maintenance and growth is a combination of art and science. This is also true in the case of cannabis production. As you get more experience in the field, you will have a deeper understanding of the ‘art’ component of the equation. The same may be said for the’science’ component of the test. However, in contrast to the arts, you may research science and truly get it right from the beginning. When it comes to the science of cannabis cultivation, heat and humidity are two of the most significant aspects to consider.

It is your responsibility to keep those levels up.

Today, we’ll look at one part of this: what to do if the humidity in your home is excessive. So let’s get straight to it and discover how to minimize the humidity in your grow tent as soon as possible.

How To Lower Humidity In A Grow Tent

Cannabis is not a fussy plant in the least. It can thrive in a wide range of environmental conditions. However, if you provide it with the optimal circumstances, it will reward you with far larger and higher-quality harvests. Even the most ideal conditions aren’t important to the plant, which doesn’t have a preference. It prefers a comfortable room temperature and average humidity. So there’s nothing exceptional here. The optimal temperature and humidity levels, however, do alter as the plant matures and becomes more established.

Different Growth Stages Need Different Humidity

Humidity levels should be increased throughout the early stages of growth to ensure proper development. During this period, plants thrive under excessive humidity. However, as plants progress through their development phases, the humidity level needs to be reduced. The optimal humidity values for each stage of plant development are listed below.

  • The percentage of seedlings and early vegetables is 70 – 75 percent, the percentage of vegetables is 50 – 70%, and the percentage of flowers is 40 – 50%.

In most cases, you won’t have to worry about lowering the humidity while you’re relaxing. In fact, depending on your location’s temperature, you may need to take efforts to increase the humidity in your grow tent. This, however, alters during the blossoming process. You may find it difficult to keep the humidity levels down during the day. Unless, of course, you continue reading. Then you’ll be able to figure out exactly what to do. But first, let’s take a quick look at why it’s important to maintain humidity levels under control.

Why Lower Humidity In Your Grow Tent?

Mold, fungus, rotting buds, and mildew can develop in your grow tent as a result of high humidity. It even has the effect of slowing the development of your plants. The most prevalent is a condition known as bud rot, which is comparable to the grim reaper for plants, appearing in your grow tent and wreaking havoc on your plants. It appears as a white powdery material at first, then becomes gray, and then becomes black as it matures. If your buds become infected with bud rot or powdery mildew, they are rendered unusable and must be discarded.

What does bud rot have to do with decreasing the humidity in a grow tent?

However, bud rot and other forms of mold and mildew aren’t the sole culprits in this case.

Internal Health Effects Of High Humidity

External factors such as bud rot and the mold and fungus that might develop as a result of excessive wetness are not the only possible difficulties. There is also the possibility of an interior issue developing. If the air is saturated with moisture, your plants’ roots will not be able to absorb as much water as they should.

The nutrients required by your plants will be depleted if your plants do not drink enough water from their roots. Nutrient insufficiency leads in buds that are less powerful and more unhealthy. The bottom line is that you must maintain humidity levels at or near the levels desired by your plants.

Lowering Humidity In A Grow Tent

The good news is that lowering humidity levels is not that difficult to do. However, there is a good probability that you may have to spend some money. You will almost surely want at the very least a ventilation system, and maybe even an air conditioning unit or a dehumidifier. You’ll need ventilation and maybe air conditioning anyhow to keep the temperature under control, so it’s not really an extra expenditure. Dehumidifiers, on the other hand, are not pricey.

Get A Dehumidifier

Reduced humidity levels are not difficult to achieve, as the good news shows us. However, it is likely that you will be required to spend money. If not a ventilation system, then an air conditioning unit or a dehumidifier will almost probably be necessary. In order to adjust temperatures, you’ll need ventilation and potentially air conditioning, so this isn’t an extra expenditure. Dehumidifiers, on the other hand, are not prohibitively costly.

Commercial Grade Dehumidifiers

If you have a large company or if you are doing this for a living, you should definitely consider investing in a commercial-grade dehumidifier right away. Even if the little ones designed for everyday use are ideal for small tents and hobby growers, they do not let you to regulate the humidity level. They can only be turned on or off; there is no in-between. While this is sufficient for the majority of individuals, it is insufficient when there is a considerable amount of money at stake. It is possible for a commercial grade dehumidifier to continuously measure and adapt its operation depending on whether it needs to remove moisture or whether it needs to rest and let the water vapor to gather.

If you are not concerned with the ability to’set it and forget it,’ or if you have a small company, you will not require a commercial dehumidifier to meet your requirements.

Ventilate Your Grow Tent

If you can get fresh air into the tent from the outside, this can assist to reduce the humidity, provided you do not reside in an exceptionally humid climate zone. Of course, if you’re going to be bringing in fresh air from the outside, you’ll also be exhausting air from within the tent, so plan accordingly. In fact, with tiny tents, all that is required is that you blow air out of the tent. In order to compensate for the negative pressure created, additional air must be drawn in. In order to exhaust the air in your grow tent, you’ll need a good inline fan for it.

Because humid air is heavier than dry air, if humidity is a significant problem but temperature is not a significant one, you can consider installing an exhaust fan at a low setting.

By leaving greater space between the plants, you may also improve circulation among the plants themselves.

As a result, there is greater space for air to circulate, and the lower branches do not form buds in the first place. You will have a greater yield if you do not use them. Make certain you simply utilize the best weed trimming scissors available. The bad ones will not cut neatly as they should.

Do Not Water More Than Necessary

Overwatering your plants will almost always result in issues. When your plants receive too much water (particularly in areas with poor drainage), it can lead to nutritional deficiencies and root rot, which can cause them to become anemic and sickly. Excess water also contributes to excessive humidity in the air. When it comes to watering your plants, make certain that you are following scientific principles. A much of water might be detrimental to your plants’ health. As a result, you are included.

How Much Water Is Too Much?

This is a subject that warrants its own book (and there are already a plethora of them available!). However, because it is important for minimizing the humidity in your tent, we will go through the fundamentals here. This might vary greatly depending on your growth medium (soil or other types of media) and drainage system. As a general rule, you should water your plants until the soil is well saturated, then allow the soil to dry completely before repeating the process. Assuming you have normal soil with adequate drainage and growing pots of moderate size, this amounts to one thorough watering every 2-3 days.

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There is a general rule of thumb that can be useful to you.

The aim is to totally soak your plants on a regular basis rather than watering them only a tiny bit every day.

In addition, it almost certainly causes the air to become excessively humid.

Lower Grow Room Temperatures

The terms relative humidity and temperature are synonymous. Temperatures that are higher than optimal are OK as long as the humidity is lower than ideal. In the same way, vice versa. This means that you may, in essence, compensate for greater than optimal humidity by maintaining lower than ideal temperatures. That being said, this is really just a smart option if you’re having trouble getting the humidity levels under control. It is far preferable to really reduce the humidity while maintaining the temperature where it should be at all times.

Consider An Air Conditioner

The most convenient method of lowering temperatures is to use an air conditioning unit. As previously said, not only is this a crucial element of maintaining the health of your plants, but it is also a simple and effective approach to reduce the relative humidity in the air. It is possible to purchase units that stand alone or are on wheels, removing the requirement for them to be permanently fixed to the wall. This is ideal for use in tents. They have an exhaust tube that has to be routed out of the tent via an aperture in the side of the tent.

The ability of the air to contain water will be reduced as a result of cooling it and circulating it around the room. The colder the air, the less’space’ there is for water to live in its natural environment.

Lower Grow Tent Humidity: Final Thoughts

Higher humidity levels are ideal for vegging, but during flowering, and especially during the later stages of blooming, you must substantially reduce the amount of moisture in the air to ensure a successful harvest. Not doing so will result in a less productive (and, in some cases, wholly unproductive) yield. There are a variety of approaches that may be used to reduce the humidity in your grow tent, but the most effective are enough ventilation and optimal circulation. It’s also crucial to keep your body temperature under control.

How to Lower Humidity in Grow Tent When It’s too High

When vegging, higher humidity levels are ideal; but, when flowering, and particularly during the later phases of flowering, you must substantially reduce the amount of moisture present in the air. If this is not done, the crop will be poorer (and in some cases, entirely damaged). When it comes to lowering the humidity in your grow tent, there are a variety of options available, but the most effective are enough ventilation and adequate circulation. It’s also crucial to keep your body temperature under control!

What Exactly is Humidity?

Allow us to be a little more specific. Humidity is defined as the amount of water contained in the air in the form of vapor. You will also learn about relative humidity throughout this presentation. It simply refers to air that has become completely saturated with water vapor and is unable to retain any further water. The relative humidity of the air must be kept at a specific level in order for plants to grow. If the humidity level surpasses the acceptable levels at any point throughout the growing process, your plants will not produce as much as you want.

The Right Humidity Level For Your Grow Tent

Plants require varying degrees of humidity at different stages of their life cycle. In each stage of growth, water is required in different amounts, which results in a distinction. As a result, make sure that your humidity is constantly within the following ranges at all times. Temperature Range: 70 to 75 percent Humidity Level at Seedling Stage Plants are in the process of developing at this time. The roots of the plant are unable to receive sufficient water for the plant. This is why you require additional moisture.

  • Having a high humidity level will assist the plants in thriving as all portions of the plant develop and thrive at the same time.
  • However, in order to maintain the fast rate of development, they will require additional water from the surrounding environment.
  • Humidity levels should be between 40% and 50% throughout the flowering stage.
  • Molds and mildews will not grow around the blooms if the humidity is kept at a moderate level.

Humidity levels between 45 and 50 percent throughout the harvesting stage. In order to prevent the produce from becoming brittle and harsh during the harvesting stage, it is necessary to maintain an average level of humidity.

Why Optimum Humidity Matters

As we have previously established, a specific degree of humidity in the air will be required at all phases of your plant’s development. This implies that if the humidity is not maintained at its ideal level at any point throughout the growth cycle, the plant will not flourish at that period. As a result, it will eventually have an impact on all of the previous phases. When the humidity is at its highest level, plants employ their leaves to absorb water and transport it to their internal systems.

  • As a result, the roots are less able to absorb water.
  • When this occurs, the plants begin to suffer from mineral shortages as a result.
  • Plants grow healthier, stronger, and more leafy when the humidity in their grow environment is at the proper level.
  • Additionally, maintaining optimal humidity helps to keep mold from attacking your plants.

Simple Ways to Lower Humidity in Grow Tent When It’s Too High

1. Provide Adequate Water This is the first topic we’ll be talking about. If you want to receive the best yields possible from your grow tent, you must avoid overwatering them. It is the most straightforward method of preserving your plants from excessive dampness. When plants are overwatered, they take up a large amount of water and retain it. It is through their breathing that they expel the extra water into the atmosphere. As a consequence, the humidity in your grow tent is higher than you had anticipated it to be.

  1. When the water evaporates, it causes the same problem as before – a high level of relative humidity.
  2. 2.
  3. We’ve already discussed that plants require varied degrees of humidity depending on their stage of development.
  4. This is due to the fact that various stages will need varying degrees of humidity.
  5. Plants that have reached maturity have begun to produce leaves.
  6. Because of this, they are able to raise the humidity levels in the grow tent.
  7. The goal here is to make sure that all of the plants in a grow tent are at the same stage of development as one another.

Explore the area around the grow tent.

Remove any surplus water that may have accumulated in the grow tent.

When the temperature rises or when air blows over them, the water in trays and jars evaporates.

This will result in a two-fold dilemma.

Empty water reservoirs and flush stagnant water out of the system.

It is possible that you will not need to remove the water supply points at all.

Try to minimize the possibility of water evaporation to the greatest extent possible.

Make use of soils that are easily permeable to water.

Every one of these distinct kinds of soils has a varied capacity for retaining water.

Sandy soil, on the other hand, has a high rate of water drainage.

In most farming situations, loam soil is preferable above other types of soil.

As a result, clay soil should not be used in your grow room.

It is recommended that you purchase loam soil.

Sand soil, on the other hand, is recommended if you want to drain a lot of water.


Make sure that your grow space has appropriate airflow.

At the same time, you must make certain that the grow chamber is always supplied with fresh, low-humidity air.

Additionally, if you want to improve air circulation in your Grow room space, consider purchasing Grow room fans.

Depending on the size of your Grow tent, you need get a fan with a sufficient CFM.

Purchase a fan that has the same CFM rating as your grow tent.

Choose one of the fans from the list below to get the greatest performance out of your Grow tent. Cloudline S6 from AC Infinity (Our Top Pick) The fan is the ideal size for a medium-sized grow tent. It produces 351 cubic feet per minute of airflow. The Most Important Characteristics

  • Ideal for a medium-sized room in terms of strength
  • Extremely peaceful
  • For more efficient power use, use the variable setting.

The fan may be purchased at Amazon. Click here to find out the most recent pricing and to purchase it right now. TJERNLUND M-67 Inline Duct Booster Fan is a fan that is installed in the ductwork. The fan produces 460 cubic feet per minute of electricity. This indicates that it may be used for a lengthy period of time without deteriorating in performance. The Most Important Characteristics

  • The fan may be purchased on For the most up-to-date pricing information and to purchase it today, please visit this page. An inline duct booster fan by TJERNLUND, model no. TJERNLUND M-67. It is capable of producing 460 cubic feet per minute (CFM) of electricity. It is hence capable of running for an extended period of time with no degradation in performance. Highlights of the Book

The fan may be purchased at Amazon. Click here to get the most recent pricing and to purchase it from Amazon. Vortex 347 CFM S Line S-600 Fan, 6″ Vortex 347 CFM S Line S-600 Fan, 6″ You will be able to grow anything you choose in your tent or indoors with this tool. The Most Important Characteristics

  • It is simple to install
  • It is convenient to use with various speed controllers. Even at its greatest speed, this tent grow fan is among the quietest on the market.

The fan may be purchased at Amazon. To find out the most recent pricing and to purchase the fan from Amazon, visit this page. The Hurricane Inline Fan has a tiny footprint, making it an excellent alternative for those with limited growing space. The Most Important Characteristics

  • Construction that is long-lasting
  • A fan that is very quiet
  • And ease of installation.

Construction that is both long-lasting and quiet; installation that is simple.

  • Runs at peak performance for a longer amount of time
  • Ultra-quiet ceiling fan
  • CFM coverage that is both strong and efficient in terms of energy usage

The fan is now available for purchase on the market. Click here to find out the most recent price and to purchase the fan right now. 6. Insulate your grow tent and keep outside humidity to a minimum. It is possible that you may have to cope with dampness that is coming from outside the Grow room at times. If you want to lower the humidity in the environment, your alternatives are restricted. You can, on the other hand, keep the humidity from influencing your growing environment. In order to avoid this, you need purchase and install insulators above your grow tent.

  1. It’s available for purchase on Amazon.
  2. 7.
  3. The usage of a Dehumidifier is the most effective way for dealing with excessive humidity generated by a grow tent.
  4. And one of the most advantageous aspects of using a dehumidifier is that it can be programmed to maintain the precise proportion of humidity that you require in your grow area.
  5. Additionally, when purchasing a dehumidifier, look for one that has an automatic shutoff option.
  6. Vremi 1,500 square feet This dehumidifier is the greatest dehumidifier you will ever find on the market.
  7. It has an energy star rating, which means it will not boost your utility expenses.

And, maybe most significantly, it is peaceful. If your Garden is located indoors, it will not be a source of distraction for others who are nearby. Click here to get the most recent pricing and to purchase it from Amazon right away.

Final Verdict

You don’t have to stand there and watch while your plants are annihilated by Humidity. Humidity may be reduced in grow tents by employing simple approaches that do not need a lot of resources. If you are seeking for successful strategies, we recommend that you use the easy hacks that we have provided in this post. To get the most out of the Grow tent, use a number of different strategies. Dehumidification is the most effective strategy out of all of these options available. If you’re searching for a long-term solution, this is the way to go.

When looking for grow tents or dehumidifiers, search for the brands and models that we have recommended in this post.

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