Harvesting for Leaves

Best Ways to Raise Humidity in Grow Tent

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Indoor planting is the deal today. With minimal space, you grow any plant that you wish to. The best thing about indoor planting is that you can control growing conditions.

Humidity is one of the essential growing conditions for plants. If you want to get the best from your Grow tent, you need to ensure the humidity level is up to the desired level.

In this article, we will discuss simple ways to raise the humidity in Grow tent. These are ways that will give your plants the most conducive environment for growth.

Let’s get started.

What Exactly is Humidity?

Let’s go back to the basics.

As a farmer, you need to understand what is humidity so that you can know when you have low or high humidity in your grow tent.

Neither of them is good.

At all times, you should maintain the humidity at an optimum level.

You can’t do that if you don’t know what exactly is humidity.

Humidity is the water vapor held in the air. In short, its amount of air in the air surrounding your growing area.

The humidity level is measured in the Relative Humidity (RH) unit by a hygrometer.

Why It’s Important to Keep the Humidity at Optimum in Your Grow Area

Humidity at Optimum in Your Grow AreaPlants need water to thrive. This is one of the reasons why you need to keep your humid levels at optimum around your growing area.

You might be now wondering how plants use the water from the air.

Plants absorb water mainly through the roots. But that’s not the only way they obtain water. The reality is that plants obtain water through other parts as well.

Plants have breathing pores called stomata. It’s through the stomata where they obtain air and moisture from the environment.

If there is no humidity in the air, the plants will only take in dry air. In turn, they lack enough water to support their system. This is the reason you would see your plant start changing in their appearance. They start curling leaves and withering.

Young plants require more humidity than mature plants.

When they are tender and growing, it’s difficult for them to only survive with the water coming through the roots alone.

Consequences of Low Humidity

Keeping the humidity in your grow area low harms your plants. The following are some of the consequences of low humidity in a grow tent.

Poor Plant Growth

Low moisture in a grow area makes the plants exert more pressure and struggle to grow. When the area is dry, osmosis takes place. Plants lose their water to the surrounding areas. As a result, it becomes difficult for the plants to grow as expected.

If the plants are young, they start withering and eventually die. In the case where the plants had matured, they experience stunted growth.

Excessive Absorption on the Roots

Low humidity will strain the plant roots. As we mentioned, the plants take in water through the roots, stems, and leaves. When the surrounding environment is dry, the roots are left to take in the water. As a result, it strains, and it can’t take in enough nutrients and water to sustain the plant.

Pest Attacks

Low humidity makes parts of the plant dry. This leaves an opportunity for pests such as molds and mites to attack your plant.

The Right Humidity Level For Your Grow Tent

At different phases, plants require different levels of humidity. The difference is brought about by the needs of water in each stage of growth. Therefore, keep your humidity always to be withing the following levels at all times.

Seedling Stage – 70% to 75% Humidity Level

At this stage, plants are developing. The roots cannot obtain enough water for the plant. This is why you need more moisture. Your baby plant will get plenty of water from the atmosphere.

Having a high humidity level will help the plants to thrive well as all parts mature and thrive well.

Vegetation Stage – 50% to 70% Humidity Level

At this stage, the plants have developed roots. However, they still need to absorb more water from the atmosphere to sustain the high rate of growth.

If the humidity is low, it will lead to a stunted growth rate.

Flowering Stage – 40% to 50% Humidity Level

In this stage, you need the humidity to be average to give a conducive environment for flowering. Average humidity will prevent molds or mildews from forming around the flowers.

Harvesting Stage – 45% to 50% Humidity Level

At the harvesting stage, you need humidity at an average level to ensure that the yield doesn’t become brittle and harsh.

Simple Ways To Raise Humidity In Grow Tent

Simple Ways To Raise Humidity In Grow TentIf you want your plants to do well, it all comes to maintaining the right humidity in your tent at all times. Depending on the stage of your plants, you need to ensure that you have the right humidity in your grow tent.

To achieve this, you have to apply the right methods and techniques of controlling humidity in grow room.

The following are simple ways to raise the humidity in your grow tent.

1. Lower The Surrounding Temperatures

Hot air is less dense as compared to cool air. Humidity is basically the ability of the air to hold water in vapor form. And this is why cool air is heavy – it holds more water vapor as compared to hot air.

Scientifically speaking, high temperatures make particles vibrate fast. They move quickly. In short, when temperatures in your grow tent, the air, and all other particles in the atmosphere moves quickly.

Water particles vibrate fast and move quickly. As a result, evaporation takes place faster. The humid air is easily pushed out through the venting systems. The air eventually loses its ability to hold more water.

So, if you want to keep more water in the atmosphere, lower the temperatures. Avoid using lights and equipment that emit more heat to your grow tent.

When the temperatures are low, the air particles do not vibrate or move faster. As a result, the air can retain water vapor without pushing it out of the grow tent.

Lower temperatures would mean that the air is well moist. Your plants will thrive well in such conditions.

Use LED Lights to Keep Temperatures at Minimal Level

The temperatures in your grow room can be done by either reducing the intensity of Ultraviolet light or regulating them on the heat suppliers.

If you are looking for the best lights that won’t produce much heat in your grow tent, consider buying the following LED lights for your grow tent.


  • Different Wattages available (1000W, 2000W & 3000W)
  • Out top pick
  • Powerful cooking system

King Plus LED Grow Light

  • Available in 600W, 1000W and 1200W
  • Comes with a bloom switch
  • Full-spectrum light
  • Energy-saving technology

Advanced Platinum Series

  • 300 watts
  • Superior 12-band full spectrum
  • Perfect for a 4×4 coverage at 18” height

Buy either of the above lights depending on the size of your grow tent growing space. To learn how to determine the best light wattage read our article on: How Many Watts Per Square Foot for Led Grow Lights You Need?

Use a Fan to Regulate the Temperatures

Fans will control the humidity in your Grow room very well. They ensure that the air inside your tent circulates evenly. As a result, it discourages temperature build up inside your tent.

It helps in cooling the air inside your grow tent. And as a result, the cooler temperatures hold more water vapor.

However, you need to ensure you use the right fans for your grow tent. The following are some of the best fans that you will find in the market today. Buy them on Amazon and install them over your grow tent.

AC Infinity Cloudline S6 (Our Top Pick)

AC Infinity Cloudline S6 gives a combination of silence and power. With its performance power and quietness, it makes it to the top of our list. It’s the best and quietest tent fan you can ever find in the market.

The fan is perfect for a mid-sized grow tent. It achieves an airflow of 351 CFM.

Key Features

  • Ideal strength for a mid-size room
  • The variable setting for efficient power consumption
  • Extremely quiet

TJERNLUND M-67 Inline Duct Booster Fan

Here is another fan that does an awesome job. It has a unique blade design that gives a powerful airflow. With the blades, the fan attains a power output of 460 CFM. This means it can run for a long time without changing its performance.

Key Features

  • Made with strong and high-end materials
  • Super quiet fan
  • Efficient blade design to blog a huge volume of air

Vortex 347 CFM S Line S-600 Fan 6”

The Vortex S-600 fan is amazing. With it, you will plant everything you would wish to plant in your tent or indoors.

The design of the fan is unique. It gives a classy look when installed over your tent.

Key Features

  • Mounts easily
  • A super quietest tent grow fan even at the highest speed
  • Convenient with different speed controllers

Hurricane Inline Fan

Hurricane Inline fan is another powerful grow tent fan. It’s also quiet and efficient. With its compact design, it saves space in the growing area. This makes it a perfect choice for anyone with a small grow area.

Key Features

  • Durable construction
  • Ease of installation
  • Super Quiet Fan

Terrabloom 10” Inline Duct Fan

This fan comes with a quiet brushless EC motor. It’s also powerful. It delivers a high airflow of up to 1065 CFM. At the same time, it’s cost-effective. It uses 150 watts only to run at maximum speed.

Key Features

  • Runs optimally for a longer period
  • A powerful CFM coverage with a low energy consumption
  • Ultra-quiet fan

2. Increase Water Sources

One of the best ways to improve your humidity naturally is by boosting your water sources. In your grow tent, place water resources on every corner.

You can place water trays in an air hole or air intake tubing. You can also hang wet sponges inside the grow tent.

The heat from your lighting systems or air flowing from conditioning systems will evaporate the water and improve the humidity around your grow tent.

However, use clean water all the time. Dirty water will encourage bacteria and fungi growth that will affect your plants. Also, change your water regularly. Don’t create an environment where fungi and other bacteria will thrive.

And something else very critical is where you place your water sources. Don’t put damp sponges next to fans, lighting systems, and any other electrical appliances. You will incur many costs to replace that equipment if water short circuit them.

Raise Humidity in Grow Tent

3. Use a Humidifier

Buying a humidifier will be one of the best decisions you will make for your grow tent. As we previously saw, every plant stage needs some level of humidity; a humidifier will give you that.

A humidifier works by evaluating the humidity level of your Grow are and extract a cool mist to balance the humidity.

The best part is that you can regulate it to attain the desired level of humidity at every phase in your plant growth. Always regulate it to the desired level.

For the best performance, buy a humidifier with a built-in humidistat. This will enable the machine to shut off automatically when the desired humid level is attained. And it’s better if you find a humidifier that can take up to 6 gallons of water at a time. This will give you a long-running power.

AIRCARE 831000 Space-Saver, White Whole House Evaporative Humidifier is the best option you will find in the market. It takes up to 6 gallons of water at a time. This will ensure that it serves you for more hours.

4. Combine Mature and Young Plants

You might think that mature plants will take everything from the younger plants. But this is not always the case. Mature plants respire more and produce more humidity.

Combining them with your growing plants is an effective way to control the humidity.

As the mature plants respire, they will give more carbon dioxide and water vapor that will help the younger plants to thrive better. They have large stomata that release more water.

Also, mature plants have developed roots that can take much water. As a result, they respire easily and quickly as compared to small plants.

The key thing here is not to overcrowd the mature plants. If you do that, they will take up most of the nutrients and leave your plants to struggle.

5. Combine Different Techniques

If you wish to get the best out of your plants, you must combine different techniques to control the humidity in your grow room. Using one technique won’t be sufficient.

For instance, if you plant young and mature crops, but the temperatures of your grow tent remains high, you would have done nothing.

To get the best results, you need to combine more than one technique.

Most importantly, ensure that your air is cool, and you have a supply of humidity. You can use a humidifier instead of planting mature trees. A humidifier would also function well than adding water points.

But if you are looking for cheap ways to raise the humidity, you can cool the air, add water points, and plant mature crops.

The idea is to ensure that you fully control your environment by getting the best results for your

Parting Shot

Humidity is useful for your plants. Without it, your plants won’t thrive well. Therefore, it’s essential to ensure that you control the humidity of your grow area well.

It’s easy if you are using a Grow tent. You can apply different techniques that will give you the best performance.

To get the best results, you need to control the temperatures, add water sources, and combine mature plants and younger ones. You need to employ practices that ensure your environment holds enough water vapor for the plants to thrive.