JWM2 said:

Short answer is raise humidity. But it’s a little more complicated than that. As the temps rise the ability to hold more moisture increases. This is also referred to as dew point. So to increase your humidity you can either decrease ambient air temp or add vaporized moisture.

This is where VPD is important. Whenever you change the conditions wether they be temps or RH you change the VPD. In order for your plants to properly transpire they need to be in a certain range.

Too low of VPD (wet conditions) means your plants will transpire less and this can cause an issue with root absorbed nutrients being mobilized throughout the plant where it’s needed.

Too high of VPD (dry conditions) means your plant will transpire too much. This causes you to have to water your growing medium more often and can lead to nute burn if not compensated for the increased transpiration.

A good VPD monitor is key to keeping your grow within the small window of optimal conditions and will tell you how to get your environment dialed in for ideal growth. You can always use a VPD chart however you may find them cumbersome to use. You may think well that’s close enough without making the proper adjustments and your grow will suffer.

It all depends on how much you want to dial in your grow environment.

I believe the grow environment is the single biggest factor in growing successfully and separates the good from the ok growers.

Dial in your environment and keep it dialed in. Your plants will thank you.

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MHOGSMI said:

If you dont feel like buying a humidifier, cut a milk jug in half. Clean it. Add water to it and let it sit open in your tent. Or grab a clean hand towel. Get it soaked, ring it out once and hang it up to dry in your tent. Won't shift your RH drastically. But it will add humidity that you didnt have before.

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Kingvega said:

How do I raise my RH in a 4x4x7grow tent

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Vagician said:

A cheap way is to add a bucket of water with no lid, an air stone, and air pump. It's hard to precisely control but it works well enough in a pinch. Just be careful that your RH doesn't get too high or you get the issues that come with that.

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