How to Raise Humidity in Grow Room

How to Raise Humidity in Grow Room

For indoor growers, growing plants indoors in a controlled environment requires careful monitoring of factors such as light, temperature, and humidity. Humidity is particularly important for the plant’s growth stages, as it affects the amount of water available for absorption by the plant. If your grow room is too dry, you’ll need to raise the humidity levels so that your plants can thrive. Here’s how to do just that.

Best Ways to Raise Humidity in Grow Room

How to Raise Humidity in Grow Room
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Why You Need Humidity in Your Grow Room

Humidity is an essential part of providing healthy growing conditions for your plants. Not only does it help them absorb water more easily, but it also prevents the leaves from drying out and falling off. Additionally, when the ambient humidity levels are high enough, your plants can draw in more carbon dioxide which helps them to photosynthesize and grow faster.

Finally, high humidity levels also help to prevent fungal and bacterial diseases from taking hold. When the air is dry, pathogens can spread more readily and infect your plants. By keeping the humidity levels up, you’ll help protect your crop from these diseases.

What Can Affect the Humidity in Your Grow Room?

There are many factors that can influence the humidity in your grow room. Temperature, air movement, and water evaporation are all important elements to consider. The temperature of your grow room will determine how much water vapor it can hold, so be sure to keep it at a steady level for optimal results.

If you’re using fans or other equipment that moves the air around, that can also lower the humidity. This is because the air is being moved, which carries away some of the moisture. Additionally, water evaporation from plants, soil, and other sources will contribute to lowering the humidity levels in your grow room as well. If these are present, you will need to take steps to raise the humidity levels.

How to Raise Humidity in Your Grow Room

Using a Humidifier

The most obvious and easiest way to raise the humidity in your grow room is to use a humidifier. These come in many sizes and can inject moisture into the air, which helps keep the humidity at an optimal level for your plants. Depending on the size of your grow room, you can find a grow tent humidifier that is suited to your needs.

This method is particularly effective if you’re using an air conditioner or heater in your grow room; both of these can quickly dry out the air within a small space, making it difficult for plants to absorb enough moisture from their surroundings.

As an added bonus, humidifiers can also help reduce static electricity and dust in the air.

Watering Your Plants More Frequently

The best way to raise humidity levels in your grow room is by watering your plants more frequently. This can be done either manually or with an automated irrigation system. When you water your plants more often, the excess water evaporates into the air, raising humidity levels in the process.

However, be sure not to over-water your plants—plants don’t like being soggy! You should also be aware that this method may not work well if you keep your grow room at a very cool temperature.

Using a Wetted Pad or Wet Towels

Wetted pads are also a great way to raise the humidity in your grow room. They consist of a porous material such as foam, wool, or cotton which is then soaked in water and placed strategically around the room. As the air passes over the wetted pad, the water will evaporate and increase the humidity within the room. You can wet your towels for the same usage and effect.

Using a Fogger

Foggers are also popular for raising humidity levels in grow rooms. They work by producing a fine mist of water which helps to raise the ambient humidity level quickly and evenly across the space. This is especially useful when you’re trying to raise the humidity quickly.

Using Water Trays or Pots

Another way to raise the humidity in your grow room is to use water trays or pots. These are shallow trays filled with either water or wet soil that can be placed near your plants. The evaporation of the water will help raise the humidity levels in the area and provide a consistent source of moisture for your plants.

DIY Humidity Booster

If you’re looking for a more budget-friendly option for raising the humidity levels in your grow room, consider making your own DIY humidity booster. To do this, you’ll need two buckets—one larger than the other—a water pump or hose, and some plastic sheeting or tarpaulin.

First, fill the larger bucket with water and place it on one side of the room. Then connect the smaller bucket (filled with rocks) to the pump or hose and set it on top of the larger bucket so that its contents can drain into it.

Finally, cover both buckets with plastic sheeting or tarpaulin to trap moisture from evaporating out of them into the air. This will help boost humidity levels without having to invest in expensive equipment or materials.

Using Live Plants

The final way to increase humidity in your grow room is by adding live plants alongside those you’re growing.

Live plants naturally release moisture as part of their transpiration process, which raises ambient humidity levels around them and thus helps other nearby plants absorb more moisture from their surroundings. Not only do they absorb carbon dioxide from their environment and produce oxygen while providing beautiful greenery but they also release moisture through transpiration (the process by which plants release water vapor).

The more houseplants you have in your grow room, the more moisture they’ll be able to produce—which will help raise the overall humidity levels over time. Just make sure that whatever live plant species you choose are compatible with those already present in your grow room—you don’t want one type of plant fighting with another for resources!

Using a Humidity Monitor

To ensure that you’re keeping the proper humidity level, you should use a humidity monitor with a built-in humidistat. These devices will measure the ambient humidity levels in your grow room and alert you when there are high levels of humidity or vice versa. This way, you can make sure you’re maintaining the right levels for your plants to thrive.


Raising humidity levels in a grow room is essential for maintaining healthy and productive plant life within it. There are many different ways for doing this, and the three most common methods include watering your existing plants more frequently, using a humidifier to introduce additional moisture into the air, and adding live (compatible) plant species alongside what’s already present in order to increase ambient humidity levels through transpiration processes.

Then, use a humidity monitor to ensure that the levels are being maintained at an optimal level for your plants. With these tips, you should have no problem keeping your grow room’s humidity at the perfect level. Good luck!

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