How To Control Humidity In A Grow Tent

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Does Temperature Affect The Ideal Humidity Range?

As you may assume, temperature does in fact play a role in where you should keep your humidity.

To get a better understanding of this relationship, we highly recommend you check out our guide on vapor pressure deficit. It will also help you get a grasp of the ideal humidity range across different stages of plant growth.

The Best Ways To Control Humidity In A Grow Tent

The best ways to control grow tent humidity are with a good ventilation system and/or a dehumidifier.
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Why Does Humidity Control Matter?

If you don’t control humidity in your grow tent, your plants will suffer. Both ends of the spectrum can cause problems.

If humidity is too high, your plants are much more susceptible to mold and mildew issues. These can quickly spread in a grow tent, and ruin an entire crop.

Excess humidity also will mess with nutrient uptake. This is because the stomata in your plant’s foliage will sense that there is plenty of moisture in the air, and it will stop taking up moisture through the roots.

Since this is where you apply your nutrients, nutrient uptake will cease as well. This leads to a stall or lag in plant growth, and can lead to deficiencies.

Not enough moisture on the other hand, and your plants will dry out and become more prone to heat stress. So, on either end of the spectrum, you’ll run into issues and your plants won’t be able to thrive.

This is why controlling humidity in grow tent is so important. We’ll cover how you can do this in a bit, but first, let’s cover the optimal humidity range across different stages of plant growth.

What Is The Ideal Humidity Range?

In general, plants prefer a slightly humid environment. This range changes across the plants different stages of life, however.

Plants like higher moisture levels during seedling and early veg, and this range will taper off to the lower end over its life. Here are some guidelines for grow tent humidity across the different phases:

  • Seedling/early veg: 70-75%
  • Veg: 50-70%
  • Flower: 40-50%

Does Temperature Affect The Ideal Humidity Range?

As you may assume, temperature does in fact play a role in where you should keep your humidity.

To get a better understanding of this relationship, we highly recommend you check out our guide on vapor pressure deficit. It will also help you get a grasp of the ideal humidity range across different stages of plant growth.

The Best Ways To Control Humidity In A Grow Tent

The best ways to control grow tent humidity are with a good ventilation system and/or a dehumidifier.

Use A Grow Tent Dehumidifier To Decrease Moisture:

  • Most grow tent growers won’t need a dehumidifier, but in instances where your plants become very bushy/crowded, you may struggle to keep moisture down.

    While you may think of dehumidifiers as a more commercial intervention for humidity, there are actually dehu’s specifically geared towards hobby growers. Many of these also offer air conditioning, helping you manage grow tent heat simultaneously!

  • Portable dehumidifiers are great for grow tent growing if you have the extra space. They can work for growers looking to remove as little as 30 pints a day all the way up to 180+ pints – there truly is a unit for every size grower. 

Final Thoughts On How To Control Humidity In Grow Tents

By simply setting up your ventilation system from the start, you shouldn’t ever struggle too much with humidity as long as you don’t overwater or leave runoff sitting in your tent. If you need a specific recommendation, our list of the best inline fans for grow tents is a great resource.

But, if things do get out of control, you can easily remedy the situation by investing in a small-scale dehumidifier. Now that you know how to control humidity in a grow tent, you shouldn’t ever have to worry!