Buy a Humidity Monitor
Just like a thermometer, a humidity monitor is also a must-have which can help you check the humidity level in your grow tent. You can also purchase a combometer—a humidity and temperature checker in one instrument.
Know the Ideal Relative Humidity (RH)
Young plants should receive 40-60% RH, while flowering plants need 40-50% or less RH. Check the chart below and make sure to follow it. I recommend you print it near the grow tent so you can go back to it quickly anytime.
Why Humidity Matters To YOU
In all stages of cannabis growth your plants will have a constant need to intake water, and the amount of water they need fluctuates with the humidity in your grow room. When the humidity is high, cannabis plants use their leaves to absorb moisture from the air which causes them to drink less water from their roots. Conversely, when the humidity is low, they will pull more water in through their roots.
Since humidity changes how much water your plants drink, and the water you give your plants have nutrients in them, being in control of humidity gives you increased control over your plant’s nutrient intake.
How to Control Humidity in the Growroom
To answer the question, “Do I need a humidifier?” growers first need to monitor humidity readings in the growroom by using a hygrometer. The necessary humidity range for most indoor crops lies between 3-55%, with an ideal target range of 40-45%.
Humidity rising above 60% can lead to molds, mildews, and other unwanted biological growth. Furthermore, high humidity prevents plants from properly taking in CO2, preventing efficient photosynthesis. In this case, a dehumidifier can be used to lower the humidity to an appropriate level.
How to Increase Humidity in a Grow Tent
Lower Extraction Fan Setting
Fans are crucial in every grow tent simply because they allow the air to circulate and be well-distributed by plants. This facilitates the exchange of air inside the grow tent and outside, as fresh air has to be introduced to prevent harmful microorganisms from increasing in number and/or staying in the area.
Lower the Temperature of Surroundings
It’s common knowledge that cool air, due to its relative density, will always sink to the bottom. A lower temperature means the air is relatively moist, thus having a more significant presence of water vapor.
How to Lower Humidity in Grow Tent
Use a Dehumidifier
A dehumidifier helps lower humidity level by drawing any moisture in your grow tent. If you live in humid areas, you may need a humidifier that is attached to a drain.
Increase the number of fans
Adding more inline fans for grow tent can help increase the amount of air from in the grow tent. You can add more ventilation by increasing the fan rotation speed or by increasing the number of fans.
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