Plants breathe carbon dioxide, so intakes sense to grow them in an environment that provides as much of that necessary gas as possible. Plants that are grown in an enclosed CO2-rich atmosphere have demonstrated remarkably accelerated growth—you can see the effect right away—kind of like accelerating healing in medical patients by feeding pure oxygen into their lungs.

Try to locate your growing room next to a gas appliance whenever possible to take advantage of carbon dioxide created by combustion in gas hot water heaters and furnaces. Pot-growing experts generally agree that 70 degrees F is about ideal for growing cannabis, and gas-burning appliances help to keep plants warm on cold nights, while traces of heavier CO2 that escapes being exhausted with more dangerous gases can be used to help your plants grow faster.

Probably the best CO2 generator is a simple low-pressure tank that would ordinarily be used to put carbonation into soft drinks, pressurize beer kegs, or power paint- ball guns. They range in volume from 20 ounces to more than 20 pounds, with prices ranging from about $25 for the former to about $100 for the latter. Some growers like to slowly bleed their tanks from a hose or hoses suspended directly over their plants, keeping them constantly refreshed with a flow of pure CO2. Others prefer to semiseal their grow room entrances with a plastic shower curtain and flood the growing space with carbon dioxide for about twenty seconds (presuming a small space of 4×6 feet or so) before sealing it for the next couple of hours. This hyperbaric chamber for plants really helps to accelerate growth and at the same time makes your plants unpleasant places for spider mites and other oxygen-breathing pests.

CO2 can also be generated by chemical processes. One of the simplest is to burn a safely enclosed (glass-jarred) candle inside your sealed grow room. So long as the candle is burning, it produces carbon dioxide, and little else, as the result of combustion. If the candle goes out before being consumed (unlikely), the atmosphere inside is saturated with carbon dioxide.

Another simple CO2 generations apostle of ordinary vinegar that has been suspended (duct-taped) upside down at a height of about one foot over a bowl filled with plain baking soda. A small (wire brad-size) hole in the center of the vinegar bottle’s cap permits—ideally—about one drop a minute to fall into the soda below, where acid and caustic react mildly to produce carbon dioxide gas.

I hope you learned something from this article and if you have any questions please go to the forum or leave comments and questions below. For high quality marijuana seeds please visit my webshop.



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  1. By How To Grow Huge Marijuana Buds – 7 Tips

    ,03 Aug 2015
    […] it works wonders for plants, high levels of CO2 can be very dangerous for humans. Read the article Growing marijuana with CO2 for more […]
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  2. By How to Grow Huge Marijuana Buds

    ,26 Oct 2015
    […] wonders for plants, high levels of CO2 can be very dangerous for humans. Read the article Growing marijuana with CO2 for more […]
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  3. By JoeCurious

    ,23 Dec 2016
    I’ve heard that spraying selzer water in the grow tent is a good cheap source of co2. True?
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  4. By latewood_ILGG

    ,27 Dec 2016
    Joe, I have heard mention of growers using carbonated water in hydroponic systems; But, I have never seen anyone using it to spray into a tent. You would definitely raise the RH in your tent. Perhaps it would best serve […]Read More
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  5. By Growinismypassion

    ,11 Apr 2017
    Man U must b a really cool dude!!! It’s great that u share all this great info w others!!
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    1. By Roy ILGM

      ,12 Apr 2017
      Happy to help 😀
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  6. By fred

    ,27 Apr 2017
    Hello, in what week do you turn on Co2? Thanks!
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  7. By David

    ,17 Nov 2017
    I see these ‘The Exhale’ bags that have an organic enzyme for sale now. Reviews on youtube show elevated levels of CO2 being produced. They say that they last up to 6 month, and they look pretty simple and safe. […]Read More
    Was this comment helpful to you?

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