How to Lower Humidity In Your Cannabis Grow Room

In order for cannabis plants to grow well, there are specific environmental conditions that must be met. The humidity level is an essential factor to control. It is important to maintain the proper humidity levels in your marijuana grow room if you intend on growing it. How to effectively control humidity.

Why is humidity controlled important?

Humidity means the amount of moisture present in the air. In cannabis grow rooms, humidity plays an essential role in plant growth. The humidity levels can be too high and can eventually lead to moldy or mildew growth. This can ultimately ruin the entire crop. The opposite can happen if humidity levels are too low. Plants may dry out or die. The perfect humidity level for cannabis plants is between 40-60% in the vegetative stages. The humidity needs to be maintained between 40-50% during flowering. It is possible to control humidity so that cannabis plants can remain healthy and thrive.

How to regulate humidity in your grow space for cannabis?

There are several methods that can help you control humidity inside your grow room. Here are some proven methods to keep humidity under control in your grow space:


This is one of the best ways to maintain humidity within a cannabis cultivation room. They remove excessive moisture from air to prevent the growth of mold and mildew. The size of your room will dictate the type and model of dehumidifier you select.


Good ventilation is another key factor for controlling humidity. Poor air circulation can prevent stagnant and uneven distribution of humidity in the grow space. Oscillating fans, intake fans, exhaust fans are all options to help with humidity control and proper air flow.

Air conditioning:

Air conditioning is a great way to maintain the right temperature and humidity level in your nursery. Temperature control can also be used to regulate humidity. But air conditioning can cost a lot and might not be needed for all types of grow rooms.


A humidifier will add moisture to your air if it is not enough. It is important to avoid over-humidifying the grow area as this could lead to mold and mildew.

Protect your grow rooms:

Seal any leaks and gaps in the room to keep outside humidity out. This will help to ensure the humidity remains within the desired range.

To sum it all, controlling the humidity levels in cannabis grow rooms is important for their success. You can control the humidity in your grow space by using various methods including ventilation, air conditioning and humidifiers. The key to high-yielding and healthy cannabis plants is humidity control.

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