How To Make A Humidity Tent

12 Ideas On How To Increase Humidity In Grow Tent

Have you noticed that your plants are pleading for water? Have you noticed that the leaves on your plant are curling upwards? Learn how to boost humidity in your grow tent or grow room if the air in your grow space is becoming too dry. Every indoor grower is aware that maintaining proper temperature and humidity levels is essential to providing your plants with a favorable environment in which to thrive. Knowledge of how to manage and enhance relative humidity in a grow tent is something that all indoor gardeners should be familiar with.

However, if your grow tent is just 20 percent to 40 percent full, you must take action immediately or risk losing your plants completely.

Low humidity within a grow tent causes your plant’s growth to be hindered and its development to be poor.

This is why increasing the humidity in a grow tent is necessary.

The strategies I’ve attempted to enhance humidity in a grow tent or grow room over the years are discussed in detail in this post, which will be a cost-effective exploration of the approaches I’ve tried.

Humidity Basics

The amount of water vapor trapped in the air is referred to as humidity. Humidity may be measured in three ways: in absolute terms, in relative terms, and in particular terms. You may also use a hygrometer to determine the humidity level, which should be one of your gardening closest friends. Because we are interested in indoor gardening, we pay particular attention to relative humidity. The relative humidity (RH) of the air is measured in relation to the maximum quantity of water that may be kept in the air at a given temperature.

It’s important to remember that the warmer the air, the more water vapor it may contain.

Consequences of Low Humidity in a Grow Tent

Now it’s time to go over some broad science! Water is used by plants to keep them cool. Their roots, which are connected to the plant’s vascular structure, absorb a lot of water, with around 95 percent of it flowing to the roots and subsequently escaping through the stomata. Only roughly 5% of the budget is allocated to the creation of additional cells. As a result of the high temperatures and dry air, there is a significant vapor pressure deficit between the leaves of your plants and the surrounding environment.

As a result, your plants are exposed to the dry conditions of the outside environment.

Growing plants become stressed as a result of the additional pressure they place on their roots in order to suck up water and compensate for a lack of humidity.

Lower levels of humidity encourage the roots to take in excessive amounts of water, which contains surplus nutrients that can burn the tips of the leaves when they are exposed to direct sunlight.

Due to a lack of humidity, there is also the danger of plant desiccation, which results in the plant becoming vulnerable to infestation by insects such as molds, white powdery mildew, and spider mites.

Importance of High Humidity in a Grow Tent

High humidity may appear to be a daunting prospect for inexperienced gardeners. Take it from a group of seasoned indoor gardeners. As grow tent users, we’ve seen firsthand how high humidity levels, particularly during the growth period, may be really advantageous. Basically, exposing your developing plants to relatively high humidity aids in the absorption of water by the plants, which is essential for their survival. Plants absorb water through their roots, but they may also be able to obtain additional water through their leaves and stems.

If there is little to no humidity, plants will not have the opportunity to get enough water for their full development and growth.

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Keep in mind that relative humidity should not be lower than 20 percent and must not be more than 75 percent. If you have a 44 grow tent, you will most likely need to maintain at least 40% humidity, however a 55 grow tent may require as much as 65 percent humidity to thrive.

The Best Temperatures for an Indoor Grow Room or grow tent

As I previously stated, the ideal grow tent temperature changes depending on the period of plant life in which it is used. Temperature and humidity go hand in hand in a grow tent. It is natural for indoor gardeners to invest in a digital thermometer and hygrometer to assist them keep track of readings.

  • As I previously stated, the ideal grow tent temperature changes depending on the period of plant life in which it is used. Temperature and humidity go hand in hand in a grow tent environment. Indoor gardeners will undoubtedly invest in a digital thermometer and hygrometer to assist them in keeping track of readings and temperatures.

What Is The Right Humidity Level?

Plants require varied degrees of humidity at different times of their lives, just as they do at different temperatures.

  • When clones or seedlings are growing, they require 70 percent to 75 percent humidity since this is the time when their root systems are developing. You may do this by utilizing propagation trays or humidity domes to provide enough of moisture in the air for your young plants to grow in. Maintaining high amounts of humidity will enhance the likelihood of your clones successfully rooting
  • Vegetable plants require 50 percent to 70 percent humidity since their roots have already begun to grow. They do, however, require the assistance of leaves in order to absorb moisture. Low humidity levels might cause development to be more sluggish. For flowering plants to grow in a pleasant atmosphere, they require 40 percent to 50 percent humidity on a consistent basis. It is possible to prevent mildews or molds from growing at this period by keeping a significantly lower humidity level
  • Humidity levels of 45 to 50 percent are normally required while harvesting in a grow tent in order to avoid your crop becoming harsh and brittle.

How Grow Tents and Relative Humidity Can Help You Grow Plants

The use of a grow tent in conjunction with a climate controller allows you to exert greater control over your plant’s growth environment. Not to mention that it will assist you in controlling the lighting cycles. Furthermore, in a grow tent with a modest air volume, it is easy to raise or increase relative humidity levels. A grow tent enables you to care for a variety of plant species throughout the year, regardless of the season, weather conditions, or climatic zone in which you are located.

Your grow tent will assist you in keeping potentially dangerous factors such as insects, mildew, mold, and parasites from causing harm to your plants and stopping them from growing.

This is why you should be familiar with the many methods of increasing the relative humidity in your grow room or grow tent.

12 Easy Ways on How to Increase Humidity in Grow Tent

Increased control over your plant’s growing environment may be achieved by using a grow tent and a climate controller. Additionally, it will assist you in controlling the light cycle duration. Furthermore, in a grow tent with a modest air volume, boosting or decreasing relative humidity levels is much easier. You may care for multiple plant kinds all year long under a grow tent, regardless of the season, weather conditions, or climatic zone in which you live. It also creates a perfect atmosphere for plants to absorb nutrients, which is beneficial.

These elements include insects, mildew, mold, and parasites. Nevertheless, all of these factors would be affected by the relative humidity of your grow tent. Consequently, understanding the many methods of increasing relative humidity in your grow room or grow tent is essential.

2. Use a Humidifier inside grow room

Investing in a humidifier has proven to be one of the finest decisions I’ve ever made. A humidifier helps to maintain high humidity levels in a grow tent by extracting a cold mist, which is essential for the development of your growing plants as they expand. Increase the moisture level of your humidifier to at least 50 percent to 65 percent, depending on the size of your grow tent. The humidifier should be placed on the bottom level of your grow tent if your grow tent has a top and bottom shelf.

However, I must caution you that leaving your humidifier running at maximum capacity in a restricted place may result in an excessive amount of moisture in the air.

I strongly advise purchasing a humidifier that has the capacity to hold at least six gallons of water at a time and has a lengthy operating life span.

3. Make Use of Propagators

Seedlings can germinate on their own in certain cases, but increasing the humidity in your grow tent with propagators can increase the likelihood of success in your plant growing endeavors significantly. Keep an eye out for how indoor gardeners safeguard their seedlings and cuttings in propagation trays and containers. Preventing the seeds from drying out can be accomplished by using propagators such as this covered propagator with a polyethylene or glass cover sheet. They have the ability to maintain high humidity levels in your grow tent, guaranteeing that your seedlings’ root systems are not stressed during the development and growth process.

4. Build your own propagation set-up

Here’s an example of an experiment that was successful for me. An adjustable extractor with a built-in thermostat that regulates the temperature by sucking in the air has been purchased for my home. I then poured a pail of water on top of my grow tent to keep it from drying out. A hosepipe is used to transfer the water into the humidifier. Suitable for both seedlings and cuttings, this procedure is simple and effective. Because it extracts a cool-mist from within the grow tent, the humidifier will help to increase relative humidity in the growing environment.

5. Hang a wet towel or set trays of water near passive air holes

Hanging a wet towel or putting a pan of water near air intakes is an apparent solution that will mist your walls and enhance the humidity level in your home. This enables for a significant amount of moisture to be absorbed into the air as a result. A towel, on the other hand, has a tendency to dry quickly and will require you to rewet it from time to time. In addition, a pot or pan of water will not necessarily produce the required relative humidity level for your environment.

6. Remove Half of Your Fluorescent Lights

Unfortunately, the most obvious answers are often the ones that are neglected. By deleting half of your fluorescent bulbs, you can lower the temperature in your home. Don’t be concerned about the strength of the light because your tiny plants don’t require much light at this point. Ventilating a grow tent is essential since it may assist you in managing or controlling the relative humidity of your plants’ environment. A properly ventilated grow tent ensures that air is exchanged both in and out of the tent during the growing process.

You can prevent hazardous germs such as fungus and bacteria from growing or surviving inside your tent as a consequence of sufficient air circulation in your tent.

Using high-speed fans will cause the air to dry up more quickly than usual, so proceed with caution.

Consequently, moisture is kept away from the plants, which can prevent dehydration and desiccation from occurring in the plant.

You may also experiment with lowering the number of fans in your grow tent in order to boost the humidity level. I recommend that you set the fans to 60% of their maximum power in order to maintain relative humidity.

8. Make use of water spray bottle

Growers are often equipped with spray bottles, so this should not pose an issue. Another simple approach is to spray water on the walls of your grow tent every morning and evening, which will keep your plants healthy.

9. Lower the surrounding temperature

This shouldn’t be a problem because most growers already have spray bottles. Spraying water on the walls of your grow tent every morning and evening is another simple strategy that you may do.

10. Opt for a swamp cooler

I use a swamp cooler to help keep the temperature in my grow tent down on occasion. The gadget assists in both cooling the air and increasing the humidity levels at the same time. It is capable of operating when the humidity is exceedingly low and the temperature is exceptionally high.

11. Stock up on water sources in your grow tent

Another low-cost method of increasing humidity in a grow tent is to increase your water supplies and distribute them more evenly around the tent. Water trays are often placed near to air intake tubes or passive air openings in my home. Similar to this, placing wet sponges near to growth trays is effective. As a result of the heat generated by a grow light or an air conditioning system, the water in the sponges will gradually evaporate, increasing the humidity in your grow tent. A pleasant reminder to utilize clean water in order to prevent unwanted fungus or bacteria from accumulating in your growing environment.

Fans and grow bulbs are powered by electricity, and when they come into touch with water, they may short circuit.

12. Reduce temperatures by adding an air conditioner to your tent

By increasing your water resources and dispersing them as needed, you may also reduce the cost of increasing humidity in a grow tent. Water trays are often placed near to air intake tubes or passive air apertures in the ceiling. Additionally, placing wet sponges near growth trays is a good idea. As a result of the heat generated by a grow light or an air conditioning system, the water in the sponges will slowly evaporate, increasing the humidity in your grow tent. Just a nice reminder to always use clean water to avoid unwanted fungus or bacteria from accumulating in your grow tent.

It is possible for fans and grow bulbs to short circuit when they come into contact with water since they are powered by electricity.


After everything is said and done, maintaining high humidity levels in your grow tent is critical to the development and health of your plants. Keep in mind that managing humidity necessitates taking into account other variables of indoor horticulture, such as temperature, ventilation, and lighting. All of the solutions I’ve discussed above are cost-effective, and the only decision you have to make is which is more appropriate for the circumstances of your grow tent and your budget. You may purchase a humidifier or air conditioner, but you can simply utilize ordinary household items to get the same results.

See also:  Where To Camp In A Tent In Missouri

As a result, you may need to experiment with different methods of raising humidity in an agricultural tent.

Originally from Arizona, Lindsey Hyland attended the University of Arizona’s Controlled Environment Agriculture Center, where she received her bachelor’s degree.

She created in order to share gardening advice and strategies with others. If you have questions about succulents and houseplants, veggies and herbs, or just about anything in a backyard garden or hydroponics garden, she’s delighted to help you out!

How to Increase Relative Humidity in a Grow Tent

Documentation Download Documentation Download Documentation Grow tents are incredible instruments that allow you to have complete control over the environment in which a plant grows. They are great for growing plants in your house, but they can be tough to handle due of the high humidity levels they produce. Many plants, particularly seedlings and cuttings, require extremely high levels of humidity to thrive. Relative humidity is a measurement of the quantity of water vapor in the air, and there are numerous simple ways to raise the level of relative humidity.

  1. In order to increase humidity more rapidly, moist sponges should be placed in the tent. Soak the sponges in water, then place them near any fans or air vents in your tent to help circulate the air. Over time, the heat and air movement will cause the water to evaporate, raising the relative humidity in the air. When the sponges get dry, you can either re-use them to maintain the humidity or remove them from the room to allow the humidity to drop again.
  • Sponges dry out more quickly than bowls of water, resulting in an increase in the amount of moisture in the air. It’s also possible to put them closer to your plants and lightbulbs in order to distribute moisture more rapidly
  • Another alternative is to place sponges inside of bowls or trays that have been filled with water. It will hasten the evaporation of water
  • When used in tiny, vertically oriented tents with shelves, sponges perform nicely. Despite the fact that these tents don’t have a lot of room, you can generally squeeze the sponges in between the plants on the shelves.
  • 2 Place water bowls inside the tent for a more gradual increase in temperature. Fill up bowls or trays in the sink, then spread them around the grow tent to keep it from being too hot. A large intake fan located near the ground on one side of the tent is common. Position one of the containers near the air vent, and then place more containers near adjacent air vents to complete the installation. In order for the water to evaporate, the humidity level must rise.
  • Water bowls are convenient since you can refill them as needed and remove them when they are no longer needed. They are more effective than towels at increasing the humidity of the tent on a constant basis. Bowls should be used in large tents with enough of floor area and ventilation. When used in conjunction with an internal ventilation fan located at ground level, they are the most effective.
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  • s3 Temporarily raising the humidity level can be accomplished by hanging damp towels. Soak the towels in water for a few minutes before spreading them out about the grow tent. Place them near any air vents that are located around the edges of your tent. As air is drawn inside the tent, it will come into contact with the towels. The moisture draining off of the towels raises the relative humidity level in the room.
  • Maintain a safe distance between the towels and grow lights and other heat sources to prevent them from burning. Towels are not intended to be a long-term solution, but they can be used to temporarily increase the humidity level. Towels may be used in any type of tent, as long as you have a place to hang them from the ceiling. The best option is to stay in tall tents with an inside fan that blows air in from near the ceiling to keep you cool. It’s also possible to hang them near air vents that are close to the ground.
  1. 1 Use a humidifier to automatically regulate the humidity level in the air. You may use a regular household humidifier to keep the air in your grow tent moist. Many grow tents are also equipped with ceiling supports from which you may hang a humidifier in order to conserve floor space. Instead of having to constantly monitor the water supply and temperature in your house, consider purchasing a humidifier with automatic settings. The humidifier will discharge water into the air in order to maintain a constant humidity level.
  • 1 Make use of a humidifier to automatically regulate the humidity level. In your grow tent, you may use a regular household humidifier, which you can plug in. Numerous grow tents are also equipped with ceiling supports from which you may suspend an air conditioner or humidifier in order to conserve floor space. Instead of having to constantly monitor the water supply and temperature in your house, look for a humidifier with automatic controls. It will discharge water into the air to ensure that the humidity level remains consistent.
  • 1 Use a humidifier to automatically regulate the humidity level in your home. You may get a small home humidifier and place it inside your grow tent to keep the environment comfortable. Many grow tents also include ceiling supports from which you may hang a humidifier in order to save on floor space in the growing area. Consider purchasing a humidifier with automatic controls, which eliminates the need to constantly monitor the water supply and temperature in your house. The humidifier will discharge water into the air in order to maintain a consistent humidity level.
  • It is critical to maintain air circulation throughout the tent in order to maintain a uniform temperature throughout
  • Thus, do not turn off the fans permanently. For bigger tents equipped with a ventilation fan with variable speed settings, this method is effective. Some bigger tents also include wall-mounted fans that may be turned down to reduce the heat.
  • 3 Lowering the temperature is a simple method of increasing humidity. Utilize the fact that your plants can tolerate a lower temperature to simply raise the humidity levels in your home or office. If your tent has a temperature control option, make adjustments to it. Alternately, you may install an air conditioner or a water chiller inside the tent to keep it cool. To keep the temperature lower than normal, you might also add fans or turn off the lights.
  • When the temperature is lowered, colder air descends to the bottom of the tent, causing condensation. Warm, moist air will ascend to the surface of the atmosphere, increasing the degree of humidity. Make sure your tent is equipped with a thermometer so that you can keep an eye on the temperature. In addition, maintain the tent well-insulated and well-sealed so that the temperature remains consistent. The temperature settings on higher-end hydroponic tents are frequently programmable. In a smaller tent with plenty of storage, you might not have enough space for an air conditioner or a water cooler.
  • 4 If you have younger plants, turn off half of the lights to help boost the humidity. Shut off the lights and allow them to cool for approximately 5 minutes before turning them back on. A common feature of grow tents is a series of tube lights strung along the top. Remove the bulbs from their sockets and place them somewhere safe. Due to fewer lighting, the temperature within the tent will be lower, resulting in a rise in the relative humidity
  • If your grow tent has many light sources, removing some of the bulbs is a fairly simple technique to raise the relative humidity in the growing environment. Some smaller tents, on the other hand, will not allow you to accomplish this. This method is most effective with young plants. Seedlings are less sensitive to light than adult plants, and this is especially true for young plants. They require more humidity than they do more light, which is why most tents are equipped with replaceable bulb lights. Some low-cost tents, particularly tall and thin versions, may not be equipped with various light sources.
  1. 1 If you have additional space in the tent, you may put larger plants in there as well. Even if you’re growing seedlings, you might want to include some fully-grown plants in your container. If you’re cultivating little herb plants, you may include some taller veggies or blooming plants to break up the monotony of your garden. Maintain a sufficient distance between the plants so that they do not overwhelm one another. Make certain that each one receives a enough amount of light and water.
  • In the event that you have excess room, you may fit bigger plants within the tent. Some fully-grown plants may be added to a seedling bed if you’re raising seedlings. Even if you’re only planting little herb plants, you may include some taller veggies or blooming plants in your garden to add some variety. Maintain a sufficient distance between the plants so that they do not compete with one another for attention. Inspect each one to ensure they are receiving adequate light and water.
  • 2 If your plants are spread out, group them together near together. Place them directly next to one another so that the leaves do not come into contact. They will still require adequate space to develop. Over time, each plant will release water that the other plants may utilize, causing the overall humidity level to increase.
  • Keep in mind that this will not totally solve the problem of low humidity, and you will still need to do things like water and spray the plants. They will hold more moisture as a result, allowing the humidity level to remain higher than normal. The fact that plants grown in a grow tent are potted means that you won’t have to worry about their roots becoming entangled. Simplest solution is to ensure that the leaves have ample space to get light and moisture.
  • 3 Mist plants with a spray bottle if your plants require a modest boost in the morning sun. Lightly mist both sides of the leaves with water to prevent them from becoming brown. The additional water will cause the humidity level to rise, and your plants will benefit from the fresh water that will be available immediately. When used on seedlings and cuttings, it is most effective since they are unable to absorb water through their roots. If you want to keep the humidity level high for the long term, you’ll have to check back each morning and spritz all of the plants again if the level has dropped.
  • Misting does not significantly increase humidity, therefore it must be done on a constant basis in order to maintain the desired relative humidity level. It is ideal to sprinkle plants first thing in the morning so that the leaves have time to dry during the day. In this way, they won’t become too dripping wet
  • Water is absorbed by plants through pores in their leaves. Make sure you spray under each leaf because the majority of the holes are on the bottom.
  • 4 If you are unable to elevate the humidity level to a satisfactory level, cover the plants with bell cloches. Cloches are domes that are used to assist manage the temperature and humidity levels in the environment around certain plants. Each plant will require its own cloche, which you will need to purchase separately. Plants should be moved beneath the domes, and then the ventilation openings on each dome should be pulled open. Cloches, even when they are open, assist in retaining more moisture.
  • Even something as basic as a plastic bag can be used to increase the amount of humidity in a room or space. For example, you may place them over seedlings. If your grow tent is correctly set up, you won’t need to use any cloches at all. They are most useful in emergency situations or when you need to swiftly elevate the humidity level. Some plants, such as carrots, radishes, peas, and parsley, do very well when grown beneath cloches
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  • If you don’t already have one, invest in a digital hygrometer that you can hang or place inside your grow tent. It keeps track of the relative humidity
  • In general, seedlings need a greater relative humidity than do mature plants. Start with a 65 percent to 70 percent concentration and then reduce it until it is 40 percent to 50 percent when the plants begin to blossom. When the humidity level is too low, the plants begin to dry out, which is harmful. For example, you could observe that the leaves are becoming dark and curled
  • In addition, high humidity levels can be harmful to plants, so keep an eye out for rot or powdery mildew.

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  • Grow tents have a large number of electrical components that are susceptible to harm from water. Make a point of keeping towels, sponges, and any other moist things away from the lighting and heating components at all times.


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Do you have a marijuana plant growing in your home? Then you’ll have a significant edge. When you’re inside, you have total control over the surroundings. You have the ability to provide your plants with the optimal circumstances for maximum development and productivity. For plants, the optimal degree of humidity depends on the stage of development they are in. Of course, if the relative humidity within your grow tent falls outside of these optimal parameters, cannabis will continue to thrive.

Furthermore, if the humidity is really low, they will suffer greatly.

Naturally, this means that there may come a moment when you will need to raise the humidity in your grow tent to get optimal results.

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How To Increase Humidity In A Grow Tent

However, before we get into the best methods for increasing relative humidity in a grow tent, we want to point out that it is possible you will not need to raise it at all. When weed plants are seedlings, they require the maximum levels of humidity possible. There is a fair probability that you are attempting to raise humidity levels because you have seedlings that require a high degree of moisture in the air to survive.

Raising Humidity For Marijuana Seedlings

It’s important to note that, before we get into the best methods for increasing relative humidity in a grow tent, you may decide that you don’t need to increase it at all. When weed plants are seedlings, they require the highest levels of humidity. That indicates that there is a considerable chance that the reason you are wanting to raise humidity levels is because you have seedlings that require a high amount of moisture in the environment.

Increasing Grow Tent Humidity: Best Methods

There are a variety of methods for increasing the humidity inside your growing environment. We’ll go through all of the greatest strategies with you below so that you can pick which one is the most effective for your situation.

Use A Humidifier

If you need to boost the humidity level in your grow tent or grow room on a constant basis, nothing works better than using a humidifier. It is the most straightforward approach, and you can obtain reasonably decent ones for a reasonable price. There are a few characteristics that you should look for in a humidifier. It should be equipped with a built-in humidistat. You may program it to turn off automatically when the humidity reaches a specified level and turn on automatically when the humidity decreases below that level.

You’ll also want one with a large enough tank capacity so that you don’t have to be filling it up all the time.

If you are unable to locate a nice humidifier that satisfies all of your needs, here is an excellent one available on Amazon that will suffice for a little grow in an area of 4 by 4 feet or less.

Using a humidifier that sprays mist into the air is a wonderful idea, but only if you use filtered water rather than tap water, which may be harmful (this is actually a good idea with any humidifier to be honest).

Tap water will leave mineral deposits on the leaves of your plants, as well as on the walls and floor of your tent, if you use it to water them.

Add Water

A less complicated method is to simply add water to your grow tent as needed. This can be accomplished by placing some bowls, buckets, or other water-holding containers on the floor. Alternatively, you may put a damp towel (or several) inside the tent to keep the bugs away. It goes without saying that this approach is less precise than utilizing a humidifier when it comes to obtaining and maintaining the desired humidity level. You’ll have to keep an eye on it and make adjustments until it’s exactly where you want it.

Reduce Ventilation

Humidity is increased in two ways when there is insufficient ventilation. For starters, the circulation of air within the tent helps to dry up any moisture. Second, moisture is carried away by the air that is vented out of the tent by the extraction fan. Of course, there are some situations in which it is not possible to reduce the volume of air that is vented out of the tent. For example, you could be coping with heat-related problems. You should always make sure that you have enough fan power for the size of your grow tent.

All of the top grow tent fans offer a variety of speeds.

Reduce Temperatures

Because colder air does not require as much moisture content to get saturated as warmer air, lowering the temperature in your grow tent will also raise the relative humidity in your grow tent. Obviously, you don’t want to resort to reducing the temperature if doing so would result in the temperature dropping below the optimal range for your plants and their present growth stage. For cannabis, this implies that you should avoid going below the following temperatures throughout each stage of growth:

  • Climate: 73° F (23° C) for seedlings
  • 70° F (20°C) for vegging
  • 65° F (18° C) for flowering

Effects Of Low Humidity On Cannabis Plants

Plants do not just absorb water via their roots; they also transpire water. They also obtain water by the extraction of moisture from the air by means of their leaves. If there is no moisture in the air, plants will be unable to obtain water in this manner and will be forced to rely only on their roots for water. When it comes to young plants in particular, this can be an issue. Clones do not yet have a well-developed root system, therefore they must obtain the majority of their water from the surrounding environment.

  1. If the relative humidity is too low, clones may not be able to root at all or only partially.
  2. During vegging, plants receive more water from their roots, but they still rely on the water provided by their leaves to survive.
  3. It can also induce nutrient burn, which can result in yellowing leaves and, in the worst case scenario, the death of your plants.
  4. Why does this happen?
  5. Understandably, it is critical to ensure that your weed plants are growing in the proper humidity conditions.

Extremely dry air can cause a variety of major health concerns. However, you must be careful not to raise the humidity levels too. When it comes to growing plants, too much humidity can be detrimental, especially during the blossoming period.

Effects Of High Humidity On Marijuana Plants

bud mold or rot is the most serious hazard connected with excessive humidity levels. Find out what mold on cannabis looks like in this article. Obviously, this only occurs during the flowering stage, when the buds are developing. You should keep humidity levels as low as possible during flowering since it is the primary cause of bud rot. In addition to low humidity, excellent ventilation is required to ensure that moisture does not build on the buds’ surfaces. Using the proper size smart pots might assist to prevent this problem.

The fact that it may grow on plants of any age implies that they are more vulnerable during the early developmental stages of their development, when humidity is higher.

An oscillating fan is ideal for this application.

Raising Grow Tent Humidity: Final Thoughts

Low humidity, particularly in the early stages of growth, can seriously impair the development of your plants. But proceed with caution. High humidity has the potential to make things worse. If your humidity level is dangerously low, invest in a humidifier and boost it; but, if it is dangerously low, you could be better off doing nothing. Being a bit low won’t have much of an impact, while being too high would. As is often the case, keeping things simple is the best approach. Learn how to keep things as easy as possible when cultivating marijuana in your home.

How To Increase Humidity In Grow Tent? Easy With 5 Tips!

Are you a gardener who enjoys your work? A garden tent is a terrific alternative if you want to be able to plant all year round without interruption. Grow tents are beneficial to gardeners because they allow them to manage the growth environment. These tents are composed of stretchy fabrics and have a bright lining on the inside to keep you visible in low light. It contributes to the retention of heat within the tent. Unfortunately, keeping the proper humidity levels within the grow tent is not a straightforward task to accomplish.

  • In my grow tent, I couldn’t figure out how to raise the humidity level!
  • Plants might suffer from reduced growth and development as a result of low humidity.
  • At different periods of a plant’s life, however, the amount of humidity it requires might vary significantly.
  • Otherwise, you risk losing your plants to the environment.

Why Is Humidity Important?

Humidity may be defined as the amount of water vapor present in the air in a specific location at any given time. In order to grow tents, we must first determine the relative humidity. It informs you of the percentage of water that is present in the surrounding air as well as the maximum amount of water that may be present at a certain temperature.

A hygrometer may be used to determine the humidity level. It would be great if you kept in mind that plants may thrive at a variety of relative humidity levels; nonetheless, the temperature within the grow tent will have an impact on how well they develop.

What Happens When Humidity Is Low?

Water is essential for plants, as we all know, but what about relative humidity? When the temperature is high and the amount of water available is limited, dry air is produced. The plants are under extreme stress as they attempt to absorb more moisture in order to counteract the drying impact of the roots. Lower humidity levels can cause the roots to absorb more water, and if there are nutrients in the water, this surplus water can be detrimental to the plant’s health and growth. Low humidity can also increase the likelihood of a plant becoming afflicted with mildew or being infested by other insects.

Why Is High Humidity Important?

Water is essential for plants, as we all know, but what about humidity is there to consider? When the temperature is high and the amount of water available is limited, dry air is created. As a result of the drying impact of the roots, the plants are under extreme stress as they attempt to absorb more moisture to compensate. Lower humidity levels can cause the roots to absorb more water, and if there are nutrients in the water, this surplus water can be detrimental to the plant’s health and development.

What Are the Suitable Humidity Levels?

Natural humidity levels always fluctuate, therefore it is advisable to adjust the humidity levels in a grow tent in accordance with the various stages of a plant’s life cycle. For further information, please see the video below.

  • Seedlings and young saplings demand a higher level of humidity. Ideal percentages should be between 70% and 75% of the total population. This is the period of time during which the plant’s root system is developing. It is important to maintain high humidity levels in order for saplings to establish robust root systems. Flowering plants need relative humidity levels between 40 and 50 percent to thrive. It provides them with an atmosphere that is favourable to their growth. Mildew and mold development can also prevented by maintaining slightly lower humidity levels. Humidity levels between 50 and 70 percent are ideal for plants that have already established themselves in the ground. Despite the fact that their roots have already established, they continue to suck in moisture through their leaves in order to grow more quickly. If possible, keep the humidity levels between 45 and 50% while you’re harvesting your crops. As a result, the fruit and vegetables will not get brittle or dry.

Although it is important to understand that relative humidity affects humidity levels, it would be preferable if you kept this in mind. So, before raising or reducing humidity levels, spend some time learning about how humidity behaves and affects plant development.

How to Increase Humidity in Grow Tent?

There are a variety of approaches that you may use to deal with the humidity issue. It will be determined by your financial situation and the amount of effort you are prepared to put in. Modest gardeners can get by with a few small stages, while more expert gardeners and pricey plants may need to take a few more significant measures. I’ve outlined a few possible courses of action from which you might chose based on your own circumstances.

1. No Cost and DIY Changes

  • Mixing mature plants with young ones is one of the simplest things you can do in your garden. Larger plants respire more deeply, which raises the humidity levels in the growth environment. In any case, avoid overcrowding the tent, since this will make it difficult for tiny plants to acquire enough light and nutrients. Remove a Couple of Lights- It’s a simple matter of logic. Increases in temperature are accompanied by a decrease in humidity. Fluorescent lights generate heat, which may be used to dry a tent. Remove a few lights from the tent, but make sure there is still enough light in the tent. Fan Speed- For plants to thrive, free airflow and appropriate ventilation are essential for healthy growth. The fans that you employ must be adjusted at a reasonable speed to be effective. If the pace is too high, it might cause the plants to dry out and also prevent vapor from settling on the leaves of the plants. The low speed will cause the humidity levels to rise. Towels and trays- This is a low-cost and simple approach for increasing humidity. A damp towel should be hung near the air intake. Placing trays of water near the plants or near the passive air holes will help to keep them hydrated. Wet sponges are also an excellent alternative. It is possible to position them near a plant and watch the water slowly evaporate
  • Spray Bottle- Spray bottles are commonly found in the gardens of most people. Use it to spray water on the tent’s walls twice a day, seven days a week. As a result, the water lingers on the surface for a longer period of time, providing the plants a better opportunity to absorb it.

2. More Expensive Changes

If none of the measures outlined above are successful for you, it is time to consider some alternative possibilities. The grow tent or space may be rather large, in which case these DIY techniques will be ineffective. You will have to spend some money, but believe me when I say that the results will be well worth your while.

  • Install an air conditioning unit- If you currently have an air conditioning unit in your grow tent, but it is not adequate, it is time to either replace it or add another unit. Before purchasing a new air conditioning unit, carefully analyze your needs depending on the weather, tent size, and other factors. Soil on the Floor- If your tent takes up a significant amount of space, it is likely that you will have some soil on the floor. You have the option of replacing this soil with one that has superior water retention. Alternatively, you may scatter it about the plants and observe the humidity levels rise
  • Construct or purchase a Propagator setup. Seedlings and young shoots are well protected when grown in a propagator, and the increased humidity aids in the growth of the plants. You will require the following items in order to construct your own set-up:
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Allow the water to run into the humidifier through a pipe and see how it generates a cool mist in the tent as it does so.

  • Humidifier- If you don’t already have one, you should consider investing some money on a high-quality humidifier. It may be able to resolve all of your humidity issues. Maintain a working percentage of 50 to 65 percent. Get a humidifier that has an automatic control feature to make things even better. Keep an eye on the humidity levels, since too much might cause difficulties.

Humidifier Facts

When we talk about boosting humidity, the first thing that comes to mind is the use of a humidifier to accomplish this. It has the ability to boost the moisture content of any growing environment by releasing water vapor into the air. Nonetheless, humidifiers are essential to a plant’s existence, especially when the plant is kept in a tent.

Humidifiers may increase relative humidity in a limited space, making the environment more favorable for plants. You can achieve the appropriate quantities of phosphorus depending on the plants and their growth stage. Keep the following considerations in mind while shopping for a humidifier.

  • The area to be covered by the grow tent, as well as its size, are critical considerations. Choose a humidifier that has the capability of covering the entire space. It also depends on the rate at which it humidifies and how long it can be left running. Look for a company that provides extensive and consistent coverage. The Water Tank’s Capacity- Every humidifier comes with a water tank of varying sizes. It would be better if you gave it some serious thought before proceeding. If it is too little, you will have to replenish it on a regular basis. When it is too large, finding a suitable location for it might be difficult. It is important to check if the humidifier has many settings available since you may require different mist settings at various times of the day. Safety features are quite important for any electrical item, and this is especially true for a humidifier. Some have an automatic shut-off feature that kicks in as soon as a specified humidity level is achieved
  • Others have a manual shut-off feature.

Can High Humidity Be Bad?

Having too much of a good thing may be detrimental, just as it is with everything in life. Even though high humidity is beneficial to plant growth, excessive humidity can do more harm than good if it becomes too prevalent. Extremely high humidity can result in a variety of difficulties, including

  • Molds are allowed to develop, and the plants’ ability to transpire effectively is hindered. It promotes the growth of bacteria and other undesirable organisms. The capacity of roots to absorb water diminishes, and they become more passive as a result. Reduce carbon dioxide intake, which is necessary for photosynthesis, by clogging the stomata of plants.


After reading this article, you should realize that increased levels of humidity in a grow tent are beneficial to the optimal growth of plants. It’s important to remember that humidity is affected by a variety of different elements, including ventilation, light, temperature, and water. As a result, it is a good idea to keep track of all parameters, not only humidity. When you have finished reading the information I have provided here, you will have a better understanding of how you may enhance the humidity levels within a tent.

The cost-effectiveness of some of the solutions allows you to experiment with them early in order to figure out what works and what doesn’t.

Please do not hesitate to contact us if you have any questions or concerns.

We are certain that you will soon be able to observe your plants developing more quickly and in a healthy manner if you follow the advice provided here.

How to Increase Humidity in Your Grow Tent (10 Easy Ways)

The most recent update was made on January 18, 2022. It is not difficult to develop a cannabis plant from seed to harvest. With order to develop that perfect sticky icky that is coated in crystals and that generates a gorgeous, potent high, you’ll need to make sure that you take care of specific elements in order to maintain your plants growing at their healthiest and happiest possible. Even while temperature, nutrition, light cycles, and other important factors are easily recalled, there is one more thing to keep in mind: relative humidity.

However, understanding the humidity requirements of your plants is only a tiny part of the struggle.

Increasing the humidity in your grow tent is important for keeping your plants happy and ensuring that they achieve their full potential.

Understanding Relative Humidity

On the surface, humidity appears to be a rather straightforward idea. What percentage of moisture is present in the air? However, there are a variety of methods for measuring humidity. If we’re talking about horticulture, we’re going to be paying close attention to relative humidity. In other words, what exactly is relative humidity? The quantity of moisture in the air in relation to the temperature of the surrounding environment is referred to as relative humidity. According to how hot or cold it is, varying degrees of moisture can be retained by the atmosphere.

The percentage of the total volume of water that the air can hold at any given moment is stated as a percentage of the total amount of water that the air can hold at any given time, up to 100 percent.

Condensation, dew, fog, and other types of moisture are the outcome of this process.

Similarly, if the temperature rises but the total amount of moisture in the air remains constant, the relative humidity percentage will decrease because the air is now capable of retaining a greater volume of moisture.

Factors That Affect Relative Humidity

All of the activities taking on in your grow tent might have an impact on the relative humidity levels within. Each of these elements has an impact on it on its own, but they also interact with one another to alter it.


As previously stated, altering the temperature of an environment will likewise alter the relative humidity of that environment. In a grow tent, fans and lighting help to regulate the temperature, which is important for crop growth. The heat produced by the lights might cause the relative humidity in the grow chamber to decrease. However, not all lights generate the same amount of heat. Compared to metal halide or high-pressure sodium lights, modern LED lights generate far less heat. Therefore, the relative humidity of your grow tent will be less affected by their presence.


The amount of ventilation and airflow in your grow tent will have a significant impact on the relative humidity within it. If the air is exchanged too fast, it might dry up and cause the surrounding environment’s humidity to drop significantly. However, if there is insufficient ventilation, the air will stagnate and the humidity will grow.


Given that humidity is a measure of the amount of moisture in the air, it stands to reason that having more water in the environment would result in a greater degree of moisture. The greater the size of your water sources, as well as the amount of water present in your grow tent, the higher the relative humidity levels you will experience in your grow tent.

How Much Humidity Do Cannabis Plants Need?

Following our discussion on relative humidity, as well as some of the elements that might influence the humidity levels in your grow tent, let’s talk about how much humidity your cannabis plants actually require. Most of the water that your plants take in will be through their roots, but they will also absorb a little amount of the moisture in the air through their leaves. This frees up their roots, allowing them to better absorb the essential nutrients they require to develop and thrive. However, the humidity requirements of your plants will fluctuate as they progress through their life cycle.


When your plants are just getting started and are still rather little, their root systems are not yet matured enough to handle large amounts of water. The result is that they will be absorbing significantly more water via their leaves, and the humidity levels must be high enough for them to adequately hydrate. Temperatures should be in the range of 65 to 80 degrees Celsius for these young plants.

Vegetating Plants

Once your plants have progressed past their first development stage and are ready to begin vegetating, you’ll need to lower the humidity in your grow tent to ensure that they thrive. Humidity levels between 55 percent and 70 percent should be sufficient at this point. Keep in mind that each strain has its own set of preferences, so these values are only a starting point for your research.

Flowering Plants

Now that your plants have made it through the vegetative stage and are ready to blossom, they’ll be requesting even lower humidity levels as they prepare to bloom. As soon as they begin to blossom, you should reduce the humidity to someplace in the 40 percent to 50 percent range.

The humidity in their habitat should be reduced gradually as they progress through the flowering stage until the relative humidity is between 30 and 40 percent by the time they are ready to be harvested.

Young plants, seedlings, and clones Vegetative stage Early flowering stage Late flowering stage
65-80% 55-70% 40-50% 30-40%
  • Additionally, see:7 Top-Rated Ceramic Metal Halide (CMH) Grow Lights – Reviews The Best of the Best

The 10 Ways How to Raise the Humidity in Grow Tents

Additionally, see:The 7 Best Ceramic Metal Halide (CMH) Grow Lights (Reviews). Favorite Selections

1. Add More Plants

See also: 7 Best Ceramic Metal Halide (CMH) Grow Lights – Reviews Best of the Best;

2. Reduce Ventilation

See also: The 7 Best Ceramic Metal Halide (CMH) Grow Lights – Reviews Top Picks;

3. How to Increase Humidity in Your Grow Tent

It may seem little, but hanging some damp towels near the air entrance of your grow tent is an excellent method to give moisture to the air in your growing environment. During the passage of air over and through the wet towels, it will take up and cling onto the water contained inside them, raising the humidity level in your grow tent.

4. How to Increase Humidity in Your Grow Tent

Because plants in the early stage of their lifecycle require the greatest amount of humidity to grow, you’ll need a means to keep them moist and content. Fortunately, propagators make this quite simple. It’s similar to a little plastic dome that keeps all of the moisture contained within it. You’ll see water droplets accumulating on the lid as a result of condensation; this is evidence that your seedlings/clones are receiving adequate humidity.

5. Add a Humidifier

What do we do when we need to increase the humidity in our homes? We add a humidifier to the mix. In other words, what works for ourselves will work for our plants as well. Adding a humidifier to your grow tent is an excellent method to rapidly enhance the amount of humidity in the environment. With a humidifier that has many various settings to select from, you can even alter the humidity level to fit the changing demands of your plants as they progress through their development cycles.

6. Reduce the Heat

Because hot air can store more total water than cool air, a hotter tent will have lower relative humidity than a cooler tent with the same quantity of moisture in the air. You may enhance the relative humidity by removing some of the heat from the air. Try removing one or more of your lights from your grow tent to see how much of an impact it has on the humidity of your grow. If you’re using several lights, try removing one or more of them to see how much of an impact it has on the humidity of your grow.

7. Spray the Walls of Your Tent

Every day, spray the walls of your grow tent with a basic spray bottle to keep the bugs away. When these water droplets evaporate, they will contribute to an increase in the relative humidity of the tent. It is possible to increase the humidity even more by spraying more water or applying it many times during the day.

8. Use a Swamp Cooler

Swamp coolers cool the air by adding moisture to it while simultaneously lowering the temperature. As a result of the fall in temperature, there is more water in the air, as well as a greater relative humidity as a result.

9. Add Water Sources

More water sources imply a greater number of sources for moisture to emerge. Adding a bucket of water or numerous small containers of water to your grow tent will cause more water to evaporate, which will result in more moisture being released into the air.

10. Cool the Tent Down

Adding an air conditioner to your grow tent will result in a fall in temperature, which will be countered by an increase in relative humidity.

This is a straightforward method of increasing humidity without the use of water. However, if you make the climate too chilly for the plants, they may not appreciate it as much.


As a result of installing an air conditioner in your grow tent, the temperature will drop, resulting in an increase in relative humidity. Without the use of any water, this is a simple method of increasing humidity. However, if you make the climate too chilly for the plants, they may not enjoy it.

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