CO2 or carbon dioxide is one of the essential components for the life of any plant. Grow tent for cannabis here. Plants use carbon dioxide for photosynthesis, the process of converting light energy into a chemical reaction that takes place inside the plant. The plant uses the energy obtained as a result of a chemical reaction for the growth and formation of fruits.

CO2 and yield

Controlling the carbon dioxide concentration is essential if the grower uses sufficient lighting to grow. Because at low CO2 levels, the plant is not able to fully convert the received light energy.

With the additional use of CO2, the plant grows faster and forms large inflorescences. The use of carbon dioxide when growing in a grow box optimizes the microclimate and affects the resistance of plants to extreme temperatures.


Raising CO2 levels outdoors is no easy task. Simple spraying will not bring the desired result, since the gas will simply evaporate. The only option is to introduce organic matter, during the decomposition of which in the soil, CO2 will be released. A distinctive feature of this method is that gas formation continues for a long time.


It is quite easy to increase the CO2 concentration in greenhouses. Here you need to proceed from the financial capabilities of the grower, the area of ​​cultivation and the number of plants.

Let’s look at the main methods:

CO2 generator for plants

It is an automatic instrument equipped with a CO2 sensor. The principle of operation is the formation of carbon dioxide by the processing of ethyl alcohol and propane. This device is advisable to use with a large growing area.

CO2 in cylinders

The principle of operation is quite simple: the balloon is placed in the grow box and the tap opens. For effective use, a carbon dioxide concentration sensor is required, since “by eye” the grower can significantly exceed the level, which negatively affects the health of the plant. Also, the cylinder itself is explosive.

Fermentation and fermentation method

It is used for grow boxes with a small area, since a small amount of CO2 is released during fermentation. Yeast is placed in the grow box and the fermentation process is activated. The main disadvantage of this method is that it requires constant monitoring. An unpleasant odor is also possible.


Dry organic matter, when mixed with water, releases carbon dioxide. The drug itself is in a convenient bottle that is easy to use. It is enough to mix the contents with water and shake the bottle. One serving is enough for 3 weeks, after use the bottle can be reused.

Dry ice

CO2 in solid form, released into the air when heated. It is used if it is necessary to sharply increase the level. With prolonged use, it is dangerous to humans, and is also a rather expensive method.

When and how much CO2 is needed?

The main rule to remember is: the plant needs carbon dioxide only in the daytime or when the light is on. Since CO2 absorption stops in the absence of light, it is not advisable to use it at night.

When grown in a growbox optimum value of concentration is the value of 1200-1500 ppm, provided that the grower uses HPS or LED lighting capacity of at least 600 watts. Professionals advise using CO2 twice a day: 30 minutes after turning on the lights and 30 minutes before turning off. Rational use will help save CO2.

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