How to increase humidity in a grow tent

increase humidity in grow tent

An important aspect of growing indoors is to keep the correct humidity for your marijuana plants. Marijuana plants require a certain amount of humidity in order to thrive. Here is a quick guide on how to increase humidity in a grow tent

What is humidity?

Humidity is the amount of water vapour that air holds. Humidity is measured as relative humidity (RH) and is a percentage of the maximum amount of water vapour that the air will hold at that temperature. So, if your humidity is at 55%, then the air is holding 55% of the water vapour it is capable of holding at that temperature.

What is important to understand is that the warmer the air, the more water vapor it can hold. So, temperature plays a key role in your humidity.

Most first time growers have problems with low humidity. Here is a quick guide on how to increase humidity in a grow tent.

Higher humidity is important

Many new growers believe that plants do not like high humidity. This is not true, for most of their lives plants love higher humidity. High humidity can be an issue when it comes to flowering but during the growing phase, it is beneficial.

Buy a hygrometer to measure humidity

Go and buy a cheap hygrometer to start with. You can pick these up for less than $10 off Amazon which has a built-in thermometer and hygrometer. You don’t need anything fancy at this stage, just a nice indicator of what temperature and humidity are inside your grow tent.

Higher humidity is important for seedlings

measuring humidity in a grow tent

Measuring humidity in a grow tent

Ever wondered why marijuana growers start their seedlings inside propagators? Well, the propagator seals in moisture creating a high relative humidity environment. This means your tiny little seedlings can focus on the task of growing without their tiny root systems (normally little more than a tap root) getting stressed out with having to provide too much moisture to those young leaves.

So, keep your young seedlings in a humid atmosphere for best results.

At the seedling stage, you want to aim for between 79-80% RH which means you need to keep your temperature at about 26-32 Celsius.

During the vegetative stage, you can lower your humidity to about 50-70% and keep your temperature between 18-26 Celsius.

During the flowering stage, you can lower your humidity to about 40-60% and keep your temperature between 15-22 Celsius.

How to increase the humidity in your grow tent

OK, so now we know why we should keep the relative humidity up in your grow tent, let’s discuss how we increase the humidity in your grow tent.

Hanging wet towels in your grow tent

One easy way to increase the humidity in your grow tent is to hang wet towels indoor grow tent. This provides a large surface area of moisture to be absorbed into the air.

Wet sponges on a plate

Place wet sponges on a small plate in your grow tent. Again, this increases the surface area of moisture and is absorbed into the air.

Put large plants in your grow tent

This one may seem counter intuitive but if you put large (non-marijuana plants in the tent it will increase the humidity). Large plants transpire more and produce more relative humidity.

Buy a cheap humidifier

Buy a cheap humidifier off Amazon. You can control the humidity pretty easy with these. This is probably the best option.

Buy a water spray bottle

Buy a cheap water sprayer bottle for a few dollars and spray water every morning and evening inside the tent and spray down the walls.

Fan & bowl of water

Use a fan within your tent (good for keeping temperature down anyway) and a broad surface of water and let the fan blow across that water to increase humidity.

Hope these hints help you with your growing experience. Remember, keep an eye on your humidity levels people and yield bigger, healthier crops.

About the Author

Jay
I first got into LED grow lights when a close friend started suffering from multiple sclerosis and needed medicinal solutions to help manage their condition.

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