How to raise the humidity in a Grow Tent? (Instant results without the dehumidifier)

I’ve been using a grow tent to cultivate indoor plants, and it has truly brought them to life. If you haven’t heard about grow tents before, don’t worry, because by the end of this article, you’ll have all the information you need about them.

Trust me, grow tents work wonders for indoor plants. One of the main reasons is that indoor plants thrive in humid environments, but indoor spaces tend to be dry. If you’re wondering what grow tents are used for, let’s uncover that mystery and explore how they’re used in detail.

In this informative guide, I’ve covered everything you need to know about grow tents, including their definition, types, methods for adjusting humidity levels, and more. If you have any doubts or questions, feel free to ask me in the comment section below.

Key takeaways:

  • Many plants love the humidity and indoors there are usually dry conditions.
  • The grow tents are perfect for indoor planting and provide suitable conditions for the plant type.
  • It is easy to raise the humidity in a grow tent which is explained below.
  • The grow tents are unique in maintaining the various conditions but humidity is one such condition that is not that easy to maintain and its value also drastically affects the plants.

What is a Grow Tent?

A grow tent is an enclosed, transparent structure that is used to grow plants in a controlled environment. They come in a variety of sizes and can be purchased or built by the individual user. The most common use for a grow tent is to cultivate cannabis, but they are also used to produce other types of plants, such as tomatoes, strawberries, and grapes.

The optimal humidity for cannabis growth is around 60-70%. To raise the humidity in a grow tent, you will need to add either water or air. Water can be added by using a watering can or hose connected to a hydroponic reservoir. Air can be added by using an air pump. In order to maintain the correct humidity, it is important to check the level of humidity every few hours and adjust as necessary.

Many plants love the humidity and indoors there are usually dry conditions. The humidifier can be a great buddy in maintaining moisture indoors. Usually, the humidity needs to be maintained at 40-75% for the plants, too low humidity will dry and stunt the growth of the plants whereas high humidity will cause fungal or mold growth in the plants.  What other options are available?

Types of Grow Tents

There are many types of grow tents, each with its specific features and benefits. Here we’ll discuss the three most common types of grow tents: regular tents, disposable tents, and hoop houses.

Regular Tents

A regular tent is a simple, unstructured bag that can be filled with air or water to create an environment for plants. The most popular type of regular tent is the HPS (high-performance shelter) tent, which is made of lightweight fabric and has a high degree of breathability.

HP’s tents allow ventilation and good light penetration, making them popular among growers who want to produce high-quality cannabis but also want to keep their plants cool in hot weather conditions.

Disposable Tents

A disposable tent is a thin sheet of plastic that can be assembled in minutes using just two poles and a sheet of fabric.

Disposable tents are versatile and easy to store – perfect for growers on the go. They offer all the benefits of a regular tent plus the added bonus of being able to quickly dispose of them after use.

Hoop Houses

A hoop house is a type of growth structure made from several interconnected hoops covered in plastic or metal screening.

Raise humidity in to grow tent without a humidifier – How to raise the humidity in a Grow Tent?

1. Place wet towels in the room

The humidity of the room can be raised by placing a wet towel in the grow tent room or around the grow tent. The water will evaporate and the moisture content in the air will rise.

The towels need to be placed near the air vents so that the moisture can be spread thoroughly in the grow tent. The drenching towels should not be placed and the towels should be kept away from lights or other kinds of lamps.

2. Combine mature and small plants 

The reason behind adding the mature plants in the grow tent is that the big plants release more moisture as they have huge leaves than their counterparts and transpire more as compared to the young ones.

3. Cover the plants

Covering the plants will also preserve moisture and keep your plants in high humidity.  You can cover the plant with sheets with stakes in between or the bell cloche will also do great.

Plastic bags that are not too big can also be placed on seedlings or tiny plants. 

4. Spray your plants 

Spraying the plants now and then using a spray bottle lightly will cover the surface of the plants in water drops and may raise the humidity level. But this will work better on the fresh cutting or the seedlings that don’t have roots developed in the initial stages.

The spraying should be done in the morning time so that the pants get time to dry and water gets into the air for the whole. Continuously checking is needed as the spraying will not raise too much humidity level.

5. Place wet sponges near the pants 

Wet sponges are other options that can raise the humidity level in your grow tents. again they should be placed near the airy spot so that the moisture spreads well.

The sponges can be placed on eight shelves as well. The water from sponges will evaporate quickly and the humidity level will increase.

6. Lower the AC temperature 

If there is an air conditioner in your grow tent, lower the temperature right away when the humidity level is low. The lowering of the temperature of AC will help the humidity level to increase.

7. Add a chiller to the room

The chiller converts the hot air into the cold air and the cold air makes less room for the drops. More moisture will be added to the air. 

8. Lower the speed of fans or cooler fans

Many times to make the plants calm and keep cool you switch on the fans and keep them on high speed. But, the high speed dries the plants and the air as well.

The moisture also gets dry. It is important to lower the speed of the fans so that the air doesn’t get dry anymore and the evaporated water added to the air stays in the grow tent for a long time. 

9. Remove extra fluorescent lights 

The fluorescent lights in the grow tent can heat the room, as they release heat more than even the grow lights.

Optimum light and heat still be tolerated but too much can dry the air and even the foliage. Make sure the fluorescent light is away from the plants. 

10. Propagation set-ups

Using the propagators in the grow tents will enhance the germination game. The propagators, specifically the covered type, increase the humidity in the grow tent. The seedling will not dry out which can otherwise happen without the propagators. 

How to Decrease Humidity in a Grow Tent

If you’re like most gardeners, you want to raise the humidity in your grow tent as much as possible to promote a healthy growth environment for your plants. Here are three easy ways to decrease the humidity in your grow tent:

1. Use a dehumidifier: A dehumidifier will remove water from the air, which will decrease the humidity level in your grow tent. You can purchase a dehumidifier or build one using a refrigerator and an air pump.

2. Open the windows: Opening the windows will allow fresh air into the grow tent, decreasing the humidity level.

3. Use a fan: A fan can be used to circulate air around the grow tent and decrease the humidity level.

Wrapping up the context

The humid conditions should not be too high and too low for the plants that you are growing indoors. In case, you cannot afford the humidifier, it’s okay above we have mentioned most of the best ways to help you raise the humidity indoors. We hope you like the information and it was helpful to you. We are happy to help. 


1. How does low humidity affect plants?

The low humidity around the plants dries out the leaves as the plant will get dehydrated and start losing water too much ultimately causing the stomata to shrink, and the growth will get stunted. Too much drying of leaves can also lead to infection on the leaves like mildew, etc. 

2. How do you increase humidity manually?

Adding wet clothes inside the rooms increases the humidity level in the room, bringing the plants inside the house, and essential oil diffusers also raise the humidity inside the house. 

3. Why is my humidity so low in the Grow tent? 

Too much air can also dry the plants and the environment in the Grow tent. Make sure that the fans are not running at full speed. The moderate fan speed for a long time also can dry the plants and air in the grow tent. 

4. What is the ideal humidity in a grow tent?

The ideal humidity in a grow tent is 40-70% so keep the level at this point as too much humidity as well as low humidity can affect the plant’s health and growth.

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