How Much Humidity In Grow Tent

Humidity: Finding the Sweet Spot for Your Grow Room

This is fantastic since it indicates that your plants are breathing properly and that there is no lack of water throughout your grow room orgrow tentseasily. Different degrees of humidity are required at different phases of a plant’s existence in order for it to seed, veg, and blossom in the proper manner. That said, you shouldn’t have a humidity level in your grow room higher than 70% at any time, so if you’re approaching that level, you might want to think about where the moisture is coming from and what you can do to avoid it from damaging your grow.

Where’s all that grow room humidity coming from?

Moisture content is a measure of the quantity of water vapor present in the air. Despite the fact that water vapor is constantly present in the air, the temperature of your grow room has an impact on the presence of humidity in your garden:

  • The higher the temperature in your grow room, the greater the amount of water vapor that can be held in the air. Heat also causes water to travel more quickly through the air, covering a larger surface, resulting in increased humidity levels in the grow room. When there is a lot of moisture and it gets hot (as in swamps), it becomes sticky and humid because there is warm water in the air and it is moving swiftly. Conversely, the lower your grow’s temperature, the less water vapor it can store. When there is little heat, the circulation of water vapor slows down, covering less surface, and resulting in decreased humidity in the grow chamber. Lower temperatures can be challenging because too much moisture can result in moisture build-up and/or freezing
  • Too little moisture can result in a bone-dry environment, similar to that of the desert in winter.

The carbon dioxide (CO2) that plants naturally emit can raise the temperature of the grow room, which will result in moisture accumulation, which will boost the humidity. If you utilize CO2 in your grow, the humidity level in your grow room will climb even more. Grow equipment, including as grow lights, can also contribute to the increase in temperature in your grow space. When the temperature in your grow room is high and the lights are turned off, the temperature will drop. After a significant drop in temperature, you may see moisture accumulating around your lights, which is a symptom of relative humidity variation.

Grow room humidity can’t be that bad, can it?

While a little more or less humidity in your grow room won’t make much of a difference, keeping it between 40 and 70 percent will. However, if you have too much humidity in your grow chamber, you’re in for a world of trouble:

  • The accumulation of moisture and an excessive amount of humidity in your grow room might result in rotting, such as bud rot or bloom rot. Because the findings won’t be seen until after harvesting, and by that time, it will be too late to correct any faults, this is the worst case scenario. You may notice white mold forming on your leaves, which prevents them from absorbing light and water. White mold will consume the nutrients from your plants and, if not caught in time, might leave your harvest ineffective.

In addition, too little humidity in the grow chamber is detrimental to plants:

  • Stasis in growth can occur if your plant is concerned about becoming dehydrated. This can result in the closure of the stomata, which means that the plants will be unable to take in much (if any) water. Deficits in nutrients- Plants love to take in water vapor through their leaves, but when there isn’t enough water in the air, your plants will have to receive their water from another source: their roots. It is inevitable that nutrients will follow your plants when they are thirsty and absorbing a lot of water into their roots. A high level of nutrient uptake is detrimental to your plants, and you may see nutrient burn on the ends of your leaves as a result.

Temperatures and Humidity Levels at Each Stage of Development Just like we discussed before, plants flourish in a variety of humidity levels throughout their lives at all stages of development. Consider the following as an example of where the humidity level in your grow room should be located: Seedlings/Clones: 70-75 percent of the population Humidity- Because your plants require time to establish strong root systems, the bulk of the water they receive is through their leaves. When your plants are newborns, you must ensure that there is sufficient moisture in the air to ensure that they are adequately fed.

  1. For vegging plants (up to flowering), maintain a humidity level of 50-70 percent in the grow room.
  2. Because plants will still need to absorb moisture via their leaves throughout the early phase of their vegging cycle, you’ll need to maintain relatively high humidity levels (60-70 percent) at this time.
  3. Humidity in a blooming plant’s growing environment: 40-50 percent of the population Humidity- Flowering plants require a suitable climate in which to grow, one that is neither too hot nor too cold.
  4. As you come closer to harvest, you’ll progressively reduce the temperature down to around 40 percent when you’re ready to clip, lowering it by 5 percent every 2-3 weeks until you reach the desired harvest temperature.
  5. You want to make sure that the environment isn’t too humid in order to avoid the development of mold.
  6. When harvesting, make sure your plants are in a location where the humidity levels are consistent and the temperature and heat are around room temperature and heat level.

Adding and removing humidity from your growing environment There are a handful of things you can do to change your humidity levels if you find yourself leaning toward being too damp or too dry while checking your humidity levels; There is too much humidity: If the air is overly humid, you may use a Dehumidifier to remove the extra moisture from the air.

Make careful to check to see when the humidifier is full and empty it if it doesn’t have a drainage mechanism, especially if the unit doesn’t have one.

Whether you just open a window or use a duct fan to drive the moisture out of the grow space and outside, it is important to do it often.

There isn’t enough humidity: Adding a humidifier to your grow space may significantly improve the humidity in your grow space.

This will allow you to know when to stop pumping the air full of moisture. Remember that humidity levels and temperature interact with one another, so raise the temperature when you want a humid atmosphere and lower the temperature when you want less moisture in the air to keep it humid in there.

What’s the Ideal Temp and Humidity for a Grow Tent?

Optimal grow tent temperature and humidity levels might vary based on the plant you’re growing, however we recommend that you keep your grow tent between the following temperature and humidity ranges:

Temperature: 62°F (17°C) – 87°F (31°C)

When it comes to temperature and humidity, this is the optimal range, and if your levels go outside of these limits, you may want to consider investing in a device that may help you regulate them.

Do I need a humidifier or dehumidifier in my grow tent?

Check the current humidity level in your tent with a hygrometer, which is an indoor humidity sensor, to ensure that it is appropriate. If your relative humidity is less than 40%, you may want to consider purchasing a humidifier. In contrast, if your relative humidity is greater than 70%, you may want to consider purchasing a dehumidifier.

What dehumidifier should I buy?

We have created a popular piece presenting the four finest grow room dehumidifiers for hydroponics, which has received a lot of attention. In that post, we break down our best products across a variety of price points.

What happens if humidity is too low in a grow tent?

Plants can become dehydrated if the humidity is too low, which is not a healthy thing. Plants that are dehydrated have a more difficult time absorbing the water that they require to thrive. This is why many greenhouses and conservatories have a humid feel to them, and it is also why plants thrive in moderate to high humidity throughout the year.

What happens if humidity is too high in a grow tent?

A high level of humidity in your grow tent is also undesirable. Extremely high levels of humidity can cause mold to grow on damp sections of your setup, as well as on the actual plants themselves. Moldy plants do not thrive in high humidity, so keep your humidity levels between 40 and 70% at all times. If you’re working with a hydroponics arrangement that has water going through it in various areas, you should exercise particular caution when the humidity is high. Mold has a greater chance of forming in the vicinity of hydroponic systems.

How do I lower the humidity in my grow tent?

Earlier this year, we published an excellent piece on how to minimize the humidity level in a grow tent. There, you’ll learn about items and techniques that may be used to lessen the humidity level in your grow tent. Building your own grow tent is a terrific method to have complete control over not just the humidity in your tent, but also all other components of your growing environment. Check out our page for a more in-depth explanation! One of the most effective inline grow tent fans may also aid to lower the humidity level to a more comfortable level.

Indoor growth, on the other hand, might provide unique issues in terms of maintaining optimal temperature and humidity levels.

Purchase a digital thermometer and a digital hygrometer to monitor the present temperatures and humidity levels. It may be necessary to purchase a humidifier or dehumidifier as well as digital controls if your humidity levels are outside of the parameters specified at the beginning of this article.

Marijuana Grow Room Setup: Optimal Humidity and Temperature

Despite the fact that it is exhilarating to see the benefits of your effort when you begin harvesting, the task is far from finished. Preventing the possibility of your crop getting destroyed or rendered unusable for smoking by properly processing it is important. Proper drying and curing are critical in reducing the possibility of mold infection while also significantly improving the taste of the product when it is smoked.


Beyond the requirement for precise temperature and humidity management during the growth phase, it is also crucial to note that the humidity level maintained during the drying process is critical to the quality of finished product. If you have too much humidity in your drying environment, you may end up with perfectly cultivated cannabis that is moldy. That is something that neither the individual user nor the dispensary purchaser desires. Having moldy cannabis on your hands is one of the most effective ways to tarnish your reputation as a dependable grower of high-quality buds.

Wet Trimming versus Dry Trimming

A less bitter flavor is produced as a consequence of the curing process, which breaks down any residual chlorophyll in the plant. Keep in mind that harsh buds are not high-quality buds. These techniques can extend the shelf-life of a crop, which is particularly significant for a product like cannabis, which does not have the option of adding preservatives to prolong its shelf life.

Wet Trimming

“Wet trimming” refers to the practice of pruning plants as soon as they are ready. Individual branches should be removed, and superfluous plant matter should be neatly trimmed with sharp scissors or shears. The drying process begins as soon as the plants are removed from the ground. What is instantly noticed is how sticky and wet the buds are because to the high moisture content. While this is a great sign of prospective quality, it is also a breeding ground for toxins and should be avoided. This condition of affairs will almost likely result in the ruination of buds; thus, it is necessary to move soon to initiate a regulated drying process.

As an added bonus, it allows you to gather the “sugar leaves,” which contain lower THC levels and can be stored separately until they are turned into edibles.

This is the location where the product is manufactured.

Dry Trimming

This approach is typically used by farmers who have a big volume of plant material and little time to handle it. The process entails chopping off branches and hanging them whole on drying lines to dry. Once the plants have dried, they are trimmed and prepared for processing.

The neatness of a wet trim is more difficult to achieve because sugar leaves will curl in toward the buds as they dry, making the job more difficult. Handling dried buds during trimming might result in the loss of strong resin crystals due to the agitation caused by the process.

Drying Room Conditions

Whatever method you use to trim your product, it is critical that the drying chamber be set up in the proper circumstances. You’ll need a cold, dark atmosphere with temperatures ranging from 59 to 71 degrees Fahrenheit and humidity levels at or around 50 percent. Yes, even after the growth process has been done, you must continue to be careful with temperature and humidity conditions.

The Drying Process

If you want to utilize the wet trimming approach, you will need to spread them out across a big surface area in order to get the desired results. Because aeration is critical, you should avoid placing the flowers on a flat surface such as cardboard or newspaper, as the buds may dry unevenly on these surfaces. The use of wire mesh or netted drying racks is more advantageous. This allows circulation to reach all corners of the room and reduces the likelihood of wet air pockets forming. Make sure to give yourself enough space to spread your crop out evenly, with a tiny bit of space between buds, in order to get the best possible outcomes.

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Excessive hurrying through the process and exposing your crop to high temperatures will almost surely result in worse quality, poorer flavor, and even the possibility of a “bad and unpleasant high.” Good luck explaining it to your investors or to a discerning dispensary that has a slew of producers fighting for shelf space in their establishment.

  • Temperature and humidity levels are measured with a thermo hygrometer. Air conditioner
  • Dehumidifier
  • Humidifier
  • Portable heater
  • Thermo hygrometer

Ensure that you inspect your crop on a regular basis, generally every three to seven days. With each inspection, they will get considerably drier and more comfortable. It will be clear that your buds have been adequately cured when they break easily in your hands and show no symptoms of stringiness or wilting. If you see any bendiness when you twist gently, this indicates that there is still water present and that they are not yet ready to be transferred to jars.

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.

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.

As previously stated, plants obtain water by sucking in water vapor from the surrounding air through a microscopic hole on the leaf surface known as a stomata. If there is little to no humidity, plants will not have the opportunity to get enough water for their full development and growth.

Things to Review

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.

  • Clones or seedlings like temperatures between 74 and 78 degrees Fahrenheit
  • Vegetable plants prefer temperatures between 70 and 78 degrees Fahrenheit
  • And flowering plants prefer temperatures between 88 and 75 degrees Fahrenheit. The harvesting process usually necessitates temperatures between 65 and 74 degrees Fahrenheit.

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

It is a widely held belief that bigger plants would suffocate smaller ones by consuming their light, nutrients, and oxygen. On the contrary, as you begin to add plants to a grow tent, especially large ones, the relative humidity will rise as a result of the increased respiration and production of relative humidity. Carbon dioxide and water vapor are released by your larger plants during their respiration, which helps them to nourish their smaller ones. Larger plants have larger leaves and more stomata, which means they may expel more water vapor following evapotranspiration than smaller plants.

The goal is to avoid overcrowding the larger plants in order to guarantee that all of your growing plants receive an equal amount of air, light, and nutrients.

2. Use a Humidifier inside grow room

Greater plants are thought to suffocate the younger ones by consuming their light, nutrients, and oxygen. On the contrary, as you begin to add plants to a grow tent, especially large ones, the relative humidity will rise as a result of the increased respiration and production of relative humidity that occurs. Carbon dioxide and water vapor are released by your larger plants during their respiration, which feeds the growth of their smaller cousins. Having larger leaves and more stomata means that larger plants may expel more water vapor following evapotranspiration, which is beneficial.

Plants in growth will then be able to utilize this moisture vapor. Keeping your bigger plants from being overcrowded is essential to ensuring your expanding plants receive an equal amount of air, light and nutrients.

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 typically equipped with spray bottles, so this should not pose a problem. Another simple method 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

Even while learning how to chill a grow tent in order to boost water vapor is common knowledge among indoor gardeners, it may be difficult when temperature management is required. Keep in mind that because cold air has a higher density than hot air, it will sink to the bottom of the container. Generally speaking, a lower temperature indicates that the air is relatively moist and contains a significant amount of water vapor. In a similar vein, decreasing the intensity of UV light can aid in the production of water vapor, but only if the amount of light is sufficient to enable water evaporation.

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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

Gardeners may achieve high humidity in their grow tents by increasing the temperature of their air conditioners or decreasing the temperature of their heaters. While this may be expensive, it is another alternative to consider if you have exhausted all other possibilities.


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.

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!

Ideal Temp And Humidity For Grow Tents

All of the growth advice out there may be extremely deceptive. It frequently gives the impression that you must do everything exactly or else your plants will perish. The reality is that cannabis is quite simple to cultivate. Apart from providing it with light and water, there isn’t much more you need to do. However, if you want to optimize your harvest, you’ll need to make sure that the circumstances are optimal. That’s exactly what all of the grow manuals will tell you. And the circumstances of the environment are among the most essential considerations.

Continue reading to find out more.

Ideal Temp And Humidity For Grow Tent

The appropriate temperature and humidity for a grow tent are determined by the stage of growth of the plants contained therein. There is no ideal growing environment that is effective at all phases of a plant’s development. If you want to be lazy and don’t care about getting the most out of your crop, you may keep your temperature at around 80° F all of time. However, you would still need to reduce the humidity in the grow tent during the budding period.

  • Stage of seedlings: 75° – 85° Fahrenheit / about 70% relative humidity
  • In the vegetative stage, the temperature should be between 70 and 85 degrees Fahrenheit with around 40% humidity (do not exceed 55 percent). In the flowering stage, the temperature should be 65° to 80° Fahrenheit with 40 percent humidity (do not exceed 50 percent).

Because the cannabis plant’s requirements vary depending on its stage of development (it is technically a different plant as a seedling than it is as a full blooming adult), the humidity and temperature must alter to accommodate these variations. Most professional growers have many rooms (or numerous large grow tents), with each area containing plants at different stages of development. This normally entails a blooming and vegging room, as well as a third room for seedlings and transplants. This makes it simple to maintain environmental management while also allowing for twice as many harvests each year.

First, let’s take a look at the two tools you’ll need to keep the temperature and humidity levels in your grow tent at their optimal levels at all times.

Tools Needed To Maintain Ideal Temp And Humidity

In order to keep your grow tent in the best possible condition for healthy plants, you’ll need several essential instruments for measuring the environment around it.


My guess is that thermometers have been around for a long time, but if not, they are a basic instrument that has been around for more than a hundred years and can tell you what the temperature of your surroundings is. The efficacy and fancifulness of thermometers differ. In general, a decent digital thermometer will be the most effective tool for the job. Although a wall-mounted model is preferable, keep in mind that it will only measure the temperature of the area in which it is installed. A tiny portable thermometer that you can easily carry around your tent will allow you to collect precise readings at various locations, especially near all of your plants, so be sure to have one on hand.

This isn’t a problem if you have a small grow tent with only a few pots in it, as you well know.

Using your portable thermometer, you may determine whether the readings from your air conditioner (which will have a thermostat) and your portable thermometer are consistent.

When it comes to air conditioning machines or other large machinery, the ability to sense temperature might be drastically off. You must base your judgments on solid facts, especially if you are running a business or semi-commercial enterprise.


An analog hygrometer from the good old days. This instrument monitors the quantity of water vapor present in the atmosphere. In the same way as thermometers are available in both wall-mounted and portable forms, this is another straightforward instrument. You should have a fixed hygrometer as well as a portable hygrometer for the same reasons that you have a thermometer, which we discussed before. You may also acquire a device that measures both temperature and humidity in one convenient package.

It is possible for excessive humidity to damage your entire garden, and it might happen without much notice to you.

If your buds become infected with bud rot, the game is ended (cue Ice-T on the car shield commercial).

You’ll be alerted as soon as it begins to climb to dangerous levels, allowing you to respond in time to save your plants’ lives!

Ideal Conditions For Seedling Stage

As previously stated, the temperature should be between 75 and 85 degrees Fahrenheit with a relative humidity of 70 percent. Seeds must germinate in order to grow, and germination necessitates the presence of humidity and heat (just not too much). The seeds will sprout when these conditions are satisfied and enough time has passed. The little young plants will poke their heads out and begin to shoot upwards once the seeds have sprouted. Even if there isn’t a lot of difference between seedling and the early leafy developing stage, the little that is required can be a game changer if it isn’t done correctly.

Perfect Conditions For The Vegetative Stage

Ideally, you want the temperature to be at 80° or so throughout this period, with the relative humidity (RH) around 40 percent. According to what you may have observed, there is no difference in temperature between the sowing and growing periods. In contrast, the necessity for humidity represents a significant shift. Seedlings thrive in wet air, but too much moisture soaking those leaves might lead to the apocalypse of the grow tent, which I am sure you do not want to experience! This large fall in necessary humidity between sowing and vegging can be attributed to the fact that leaves prefer drier air during this time period.

As a result, they become ill and absorb less light and nutrients, resulting in a weakening of the crucial photosynthetic activity in the process.

Ideal Temp And Humidity For Bloom

During the last stages of growth, plants require slightly colder air and lower humidity levels than they were previously used to experiencing. In terms of technicality, the humidity window becomes narrower in this phase compared to the preceding phase. This phase can have humidity levels ranging from 40 to 50 percent, which is a bit lower than the previous stage of development. This is due to the fact that buds are fickle in their behavior. When there is too much heat, the air’s ability to hold water increases.

Keeping all of this in mind (or, better yet, writing it down in a notebook you carry with you) might assist you in making your grow tent the optimal environment for your plants.

The major reason temperature matters is that it has an influence on the ability of the air to contain water, which brings us back to the topic of humidity.

However, if you make a mistake and the weather becomes too cold or too hot for a short period of time, you will not lose your crop.

If, on the other hand, the humidity rises to dangerous levels and your plants get bud rot, you have a serious problem on your hands. As a result, make sure you have enough fans in your grow tent at all times.

Ideal Grow Tent Humidity And Temp: Final Thoughts

Maintaining the correct temperature and humidity levels in your grow tent is critical to optimizing the amount of marijuana you can harvest from your plants each harvest. However, the temperature and humidity that your plants require do not remain consistent during the growing process. Plants require warm and humid temperatures throughout their initial stages of development. Increasing the temperature and humidity is necessary as they progress through the phases of the process. If you follow the instructions above, your plants will not suffer any negative consequences as a result of their exposure to a bad environment, and they will repay you with abundant harvests.

Growing marijuana is straightforward, but producing marijuana and harvesting the greatest possible crop necessitates meticulous attention to detail.

Some deep budget brands perform admirably and allow you to save a significant amount of money.

The Key Element Most Grow Rooms Neglect and 3 Reasons To Stop –

It’s easy for new growers to overlook the need of maintaining optimum humidity levels. When it comes to the cultivation process, this is a critical step. Humidity, on the other hand, is a temperamental creature. Growing cannabis indoors has proven to be a difficult task for even the most experienced producers around the country. The cannabis plant is extremely sensitive to fluctuations in humidity, which can be extremely detrimental to a grower’s productivity. That’s where Anden comes in, assisting cultivation firms in growing more effectively via the use of excellent solutions that are tailored to their individual growth requirements.

Ideal Humidity Changes for Each Cannabis Growth State

In the seedling stage, relative humidity levels should be 70 percent or more; during the blooming stage, relative humidity levels should be as low as 30 percent. As a result, it is critical to maintain a wide variety of indoor humidity levels throughout the whole growth phase. This necessitates having simple control over the humidity levels in your grow space. Seedlings and clones | Optimal levels: 70-80% of total Because the root system of seedlings and clones has not yet developed, high humidity levels are beneficial to their growth.

  1. Vegetative |
  2. As the plant begins to take root during the vegetative phase, humidity levels can be reduced by 5 percent every week until the plant is well established.
  3. During this period, the water will evaporate via the leaves of the plant, aiding in the cooling of the plant and the natural addition of more humidity to the air.
  4. Optimal levels are 40-50 percent of total.
  5. Any humidity level more than 60% has the potential to harm the plant, which relies on moisture from the soil to survive and thrive.
  6. Less than 40% of the plants are in bloom.
  7. This can, in turn, serve to increase the production, flavor, and look of the plant in the long run.

Among the many dehumidifiers available in this market, Anden dehumidifiers are the only ones that are designed expressly to provide the colder, drier grow room conditions that imitate autumn, which are excellent during the flowering period of the plant.

An Organic Approach to Cannabis Cultivation

Every producer is growing cannabis in an unique set of environmental parameters – temperature and humidity – that are intended to produce a certain strain of marijuana. Unfortunately, when inadequate environmental solutions allow mold and funguses to infiltrate your crops, they have the potential to harm your harvest. When it comes to completely eliminating these dangerous factors from your grow environment, there are only two options:

  1. You can employ chemicals, which can have an impact on the quality and potency of your crop
  2. However, this is not recommended. Create a balanced atmosphere for your crop to thrive in if you choose the organic method of growing food.
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When you provide your cannabis with a healthy, organic environment to develop in, you can avoid water from collecting on the leaves of your plants in its physical form. As moisture remains on your crop for an extended period of time, the greater the likelihood that destructive mold or fungus may spread to the rest of your harvest. In reality, 97 percent of the water that is applied to cannabis plants evaporates into the atmosphere. In other words, for virtually every gallon of water you provide to your plants, another gallon must be taken from the air in order to maintain balanced levels that will prevent plant mold and disease.

97% of the water dispensed to cannabis plants ends up in the air

Maintaining a balanced atmosphere entails more than just making sure your temperature and humidity are at the proper levels. If you want to stimulate growth while also conserving energy and, ultimately, money, you must create the best possible atmosphere for yourself to succeed. For example, if you theoretically want to create an atmosphere with a temperature of 75 degrees and 50 percent humidity, it will be hard to maintain that precise temperature and humidity level for an extended length of time.

  1. To maintain a balanced environment, you want to stay as near to those environmental criteria as feasible.
  2. The only issue with this is the cost connected with operating an air conditioner nonstop all day and all night.
  3. As a result, every second it continues to operate longer than it should represents additional money spent on energy.
  4. Your air conditioner won’t have to work as hard to eliminate moisture, and it will be able to simply chill your growing space.
  5. Those two systems can work together to provide a more balanced growth environment if the correct controls are in place.

Control Your Grow

Find out more about Anden cultivation systems, or get in touch with a provider near you, right now.

What Is The Best Humidity For Growing Cannabis Plants?

Cannabis is a high-value plant that has come to be farmed mostly indoors because of its great sensitivity to environmental factors. When it comes to cannabis growing, each stage needs a unique type of tune-up in order to achieve optimal growth and high-quality harvests. Not only does humidity play a role in the growth of this magnificent plant, but it also plays a role in the correct curing of cannabis, as well as in the use of improper storage containers and storage conditions when cannabis is in storage.

Drought and high humidity are two environmental conditions that might influence the development of cannabis.

The following are the three types of humidity that are commonly encountered:

  • Specific humidity – The specific humidity of a given location is defined as the ratio of the amount of water vapor to the amount of dry air in the atmosphere. Absolute humidity is the actual quantity of water vapor present in a particular region
  • It is measured in percentage. When a relative humidity measurement is made, it is the difference between the quantity of water vapor that is actually present in an area and the amount of water vapor that the region is capable of holding.

The relative humidity is utilised in the growth of cannabis, just as it is with any other plant. It’s also worth mentioning that humidity and temperature are closely tied to one another. The amount of water vapor that a given volume of air can contain increases as the temperature of the air rises.

What Factors Affect Relative Humidity Control For Cannabis?

When it comes to finding the proper relative humidity for growing cannabis plants, there are three important considerations to keep in mind. There are three of them: geography, genetics, and developmental phases. Despite the fact that there are less severe and more varied scenarios, these three have the biggest influence.


Because of the temperature relationship discussed above, colder places have less moisture in their air. Growing cannabis in these conditions necessitates the rise of relative humidity to an optimal level. However, humidification management is less necessary in hot or tropical locations because most cannabis plants thrive in environments with greater relative humidity.


Over the years, a large number of different cannabis cultivars have been created. While certain cannabis species thrive in warmer and more humid environments, other cannabis species thrive in colder and less humid environments.

Growing Stages

The cannabis plants need fluctuations in humidity conditions throughout their life cycle, from germination to late blooming. Because each step involves a unique set of metabolic events, the relative humidity requirements for each stage differ.

Why Is Humidity Important For Cannabis Plants?

To understand how humidity impacts the growth of cannabis, it is necessary to first understand the method by which the plant breathes. The sugars created during the photosynthesis process must be transformed into energy that will be utilized to promote the development of the plant’s cells. The cannabis plant must absorb carbon dioxide from the surrounding environment in order to transform the carbohydrates, mostly glucose, into energy and oxygen, which are then released back into the environment.

  1. When this procedure takes place, some water from the plant’s water reservoir is lost to the environment, which is harmful to the ecosystem.
  2. There are two possible outcomes: A large reduction in the water concentration gradient occurs when the air is wet (high relative humidity), which is due to the greater amount of water vapor present in the air.
  3. Strong water loss occurs when the air is dry (low relative humidity), as a result of a high water gradient produced between the plant and the surrounding environment.
  4. Briefly stated, relative humidity is critical to the growth of cannabis plants because it affects the respiration process and its associated activities, such as the loss of water.

In order for a cannabis plant to reap the full benefits of relative humidity, it must be kept at its optimal humidity level. It will also be beneficial if the humidity is maintained at a steady level for a prolonged length of time.

Should Humidity Be Low Or High For Cannabis Plants?

Cannabis plants are cultivated in a relative humidity range of 70-40 percent, which is ideal for their growth. This is neither an excessively high nor an excessively low humidity level. As previously stated, both extremes of relative humidity have the potential to produce cannabis plant stagnation, as explained above. In addition, it is important to be aware that high humidity might encourage the formation of mold, which can negatively impact the growth of your marijuana plants.

What Humidity Should I Have In My Grow Tent?

When growing cannabis in a grow tent, it is important to keep environmental factors like as humidity and temperature under control. It is well-known that different phases of the cannabis plant require varied amounts of humidity, but it would be beneficial if you could keep the humidity in your grow tent quite high for cannabis seedlings when they are in the early stages of growth. The quantity of humidity in your cannabis grow tent is influenced by a number of things. These are some examples:


If the lights in your grow tent are left on all of the time, the temperature of the enclosed air is elevated, which in turn raises the relative humidity. Grow chambers with insufficient lighting circulate chilly and dry air (low humidity).


The relative humidity in your grow tent will decrease as a result of enhanced air circulation if your grow tent is properly ventilated. It is necessary to provide ventilation to mature cannabis plants, which demand a low relative humidity.

Frequency of Watering

It is more effective to water cannabis plants under a grow tent since it boosts the plant’s water absorption through the roots. The high rate of water intake by the plant increases the rate of water loss via the leaves, increasing the humidity in the space. It is this increased moisture that allows the marijuana plant to maintain its health by regulating its respiration process (see Figure 1). It should be noted that watering should be optimized in order to maintain the necessary level of humidity in the grow tent.

What Humidity Is Good For Cannabis Flowering?

It is advised that the relative humidity of a blooming cannabis plant be between 40 and 50%. The moisture content has been decreased to this level primarily to avoid the formation of mold, which is particularly dangerous at this point. Isn’t it true that a mold infection on a single cannabis blossom may completely spoil a whole harvest? Consequently, lowering the humidity at this time is quite important and should not be disregarded. When the cannabis comes near to harvesting, it is also possible to lower the humidity below 40% of the surrounding air.

In conclusion, it can be stated that humidity is a necessary condition for the growth of cannabis plants to be successful.

However, using either manual or automatic hygrometers, it is simple to determine the relative humidity levels in cannabis growing facilities.

If you cultivate your cannabis plants under a grow tent, you will also benefit from the automatic lowering of humidity levels that will occur. This is accomplished by the employment of dehumidifiers and fans of commercial scale.

Humidity Goals For Grow Tents

When you’re growing plants in a grow tent, humidity is always a factor in the success of your endeavor. Humidity percentages should be checked on a regular basis, both night and day, because variations might occur. For home growers that use grow tents, a suitable humidity target is 50 to 55 percent relative humidity (RH) (relative humidity). It is suggested to keep relative humidity between 50 and 55 percent since it truly helps to prevent powdery mildew and other fungal plant diseases from developing.

  • Ultimately, this aids in the protection of the plant against possible harvest-killing pests and diseases.
  • In the veg phase of growth, cannabis plants may respond favorably to 65 percent or 70 percent light, however these percentage levels would imply that the grow tent atmosphere is favourable to powdery mildew growth.
  • Humidity levels that are too high might make it difficult for plants to absorb nutrients.
  • Because plants require moisture, if the humidity is too low, the plants will suffer.
  • You’ll have to adjust it from time to time.
  • Growers in humid areas, on the other hand, require the polar opposite.
  • Despite this, many growers reside in regions that necessitate the use of both humidifiers and dehumidifiers at various points throughout the year.

Common Humidity %Recommendations For Cannabis Cultivation

Many humidity recommendations for cannabis cultivation are comparable in appearance to the percentages shown below.

  1. Humidity for seedlings and clones should be 70 to 75 percent
  2. For vegetables, 50 to 70 percent
  3. And for flowers, 40 to 50 percent.

While these humidity targets are sufficient, they will not assist you in preventing powdery mildew, which is a very prevalent concern for indoor growers that use grow tents to cultivate their plants. A humidity target of 50 to 55 percent, on the other hand, is achievable. Avoiding powdery mildew is critical since it can result in a loss of crop. If you are rooting clones, it is understandable that the humidity might rise to 60 percent or even 70 percent at some periods. If you do, though, use caution because you are essentially creating an atmosphere favourable to powdery mildew growth.

Infected plant surfaces may appear white for a few days after powdery mildew spores have infected them. Once visible to the naked eye, the white powdery mildew globs will be visible for several weeks.

Don’t be blindsided, be prepared!

While you’re working on getting the humidity percentage just right, consider using the Airo Home Hobbyair purifier to be prepared and prevent powdery mildew. These air purifiers are suitable for grow tents of at least 4 x 4 ft and up to 12 x 12 feet in size. Simply place Airo Home Hobby in your grow tent, or in the area where your grow tent is being used to grow plants. If you live in a location where powdery mildew, blight, botrytis, and other plant diseases are common, Airo Home Hobby is your greatest preventative protection against these extremely infectious plant diseases, according to the manufacturer.

Keep it running in your grow tent 24 hours a day, seven days a week.

Lastly, consider the following 5 tips to keep your humidity goals on track.

  1. Pay close attention to the data on your hygrometer, particularly the daily highs and lows. The majority of hygrometers have a high/low function
  2. It is recommended that you purchase more than one hygrometer to guarantee that you are receiving reliable readings. Watering your plants at night may cause the humidity to climb dramatically, so avoid doing so. Always water your plants first thing in the morning when they first wake up. Make sure that there is adequate air movement in your grow tent. In a grow tent, a single exhaust or intake fan, as well as one or two tiny clip-on fans, is sufficient to provide adequate air movement. You may also open the grow tent doors (unless you’re in FLOWER at the darkest hours of the day) to improve airflow and humidity. However, while it’s typical to have the grow tent zipped up, there are occasions when you’ll need to unzip it and leave it open.

Do not overlook the importance of humidity as a determining element. Prepare for the worst by taking preemptive actions to handle and control the situation successfully. In addition, your plants will not be harmed.

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