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best humidity for growing cannabis

Best humidity for growing cannabis

Did you know that mold infestation on one cannabis flower can ruin your entire harvest? Lowering the humidity in this stage is, therefore very crucial and should not be overlooked. The humidity can also be reduced below 40% when the cannabis is close to harvest. This, however, depends on how your cannabis plants respond to changes in humidity.

Two scenarios can occur:

While many cannabis growers identify sensitivity to the condition of the soil and the nutrients available for the plant, it’s environmental conditions that really matter. One of the environmental factors that affect the growth of cannabis is humidity.

When you cultivate cannabis in a grow tent, conditions such as humidity and temperatures must be appropriately controlled. While by now we know that different growing stages of the cannabis plant require different levels of humidity, it would help if you kept the humidity in your grow tent relatively high for cannabis seedlings. Several factors affect the amount of humidity in your cannabis grow tent. These include:

Frequency of Watering

Cannabis plants are grown in a relative humidity range of 70-40%. This is neither too high nor too low humidity. As discussed above, both extremes of relative humidity are potential causes of cannabis plant stagnation. It is also good to understand that high humidity may support the growth of mold that may affect the growth of your marijuana plants.

When the air is moist (high relative humidity)

The high water gradient created between the plant and the surrounding air causes high water loss. The marijuana plant will try to prevent this by closing the stomata, a process that compromises the vital respiration process.

Why Is Humidity Important For Cannabis Plants?

If the lights of your grow tent are always on, the temperature of the contained air is raised and hence the relative humidity. Poorly lit grow rooms have cold and dry air (low humidity).

Cold regions have less moist air due to the temperature relation stated above. Growing cannabis in these areas means that the relative humidity must be increased to an optimum level. On the other hand, hot or tropical regions require less control of humidity as most cannabis plants are highly favored by relatively higher humidity.

Best humidity for growing cannabis

According to Wikipedia: “the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 to 0.95 kPa.”

Maintaining high levels of humidity will dramatically increase the chances of clones rooting successfully, and will increase young clone growth.

Put the “outdoor” module in your grow tent or box.

Humidity is too low – how to increase humidity

Thanks to Tokiehardo for this awesome tip!

Best humidity for growing cannabis

Plants need nutrients to grow but give your cannabis plants too much, they will get nutrient burn, also known as nute burn. This is when the leaves turn yellow and the edges and tips turn brown looking burnt.

At Atlas Scientific, we have the perfect solution to control RH levels and make growing cannabis stress-free! We understand finding the perfect humidity sensor is a mission itself, that’s why we have built our own.

$34 billion every year. As more legal growers take on the challenge, Americans are on the hunt for the best indoor grow rooms (under strict governmental rules & regulations) to obtain the best yield and improve plant growth!

Controlling humidity levels is not difficult, but getting it right will boost your production levels. This article will tell you everything you need to know regarding humidity, from controlling it, to what equipment you can buy.

Nutrient Issues

Humidity and temperature are closely related and play a vital role in harvesting cannabis. Humidity measures how humid the air is in a given area, in your case, this will be the grow room. Obtaining the ‘perfect’ amount of humidity (relative humidity, or RH) is crucial.

Giving plants the correct amount of humidity, allows their pores to open up inside the leaves, respire more CO2, and grow faster. However, exposing them to too much humidity can cause diseases such as bud rot due to water build-up encouraging bacteria and fungi to overrule the foliage.

This process occurs when the plants take up too much water due to high temperatures and low humidity in the growing area. As they drink more water, the uptake of nutrients via their roots is excessively increased causing a nutrient burn.

Reduced Growth

The million-dollar question asked by many grow enthusiasts is: “What should my humidity levels be to optimize cannabis growth”.

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