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How do you get co2 into your plants?

Discussion in 'General Marijuana Growing' started by Ralphie, Jul 23, 2007.


    Ralphie Well-Known Member

    I did a search for "co2" and got no results.. I guess too few characters. How would i go about putting co2 in to my aeroponics setup

    AzGrOw-N-sMoKe New Member

    take a gallon water jug...fill it halfway with water add lots of suger an some active yeast poke a whole in the lid then shake it up..in a few days it will begin to start forming co2 after a few days..a jug lasts about 2weeks befor it needs to be refreshed..

    LURP Well-Known Member


    LURP Well-Known Member


    Elevating carbon dioxide levels can increase growth speed a great deal, perhaps even double it. It seems that the plant evolved in primordial times when natural CO2 levels were many times what they are today. The plant uses CO2 for photosynthesis to create sugars it uses to build plant tissues. Elevating the CO2 level will increase the plants ability to manufacture these sugars and plant growth rate is enhanced considerably.
    CO2 can be a pain to manufacture safely, cheaply, and/or conveniently, and is expensive to set up if you use a CO2 tank system. CO2 is most usable for flowering, as this is when the plant is most dense and has the hardest time circulating air around its leaves. If your strictly growing vegetatively indoors, (transferring your plants outdoors to flower), then CO2 will not be a major concern unless you have a sealed greenhouse, closet or bedroom, and wish to increase yield and decrease flowering time.
    For a medium sized indoor operation, one approach is to used CO2 canisters from wielding supply houses. This is expensive initially, but fairly inexpensive in the long run. These systems are good only if your area is not too big or too small.
    The basic CO2 tank system looks like this:
    20 lb tank $99
    Regulator $149
    Timer or controller $10-125
    Fill up $15-20
    Worst case = $395 for CO2 tank setup synced to a exhaust fan with a thermostat.
    CO2 is cheaply produced by burning Natural Gas. However, heat and Carbon Monoxide must be vented to the outside air. CO2 can be obtained by buying or leasing cylinders from local welding supply houses. If asked, you can say you have an old mig welder at home and need to patch up the lawnmower (trailer, car, etc.)
    For a small closet, one tank could last 2 months, but it depends on how much is released, how often the room is vented, hours of light cycle, room leaks, enrichment levels and dispersion methods. This method may be overkill for your small closet.
    It is generally viewed as good to have a small constant flow of CO2 over the plants at all times the lights are on, dispersed directly over the plants during the time exhaust fans are off.
    Opportunities exist to conserve CO2, but this can cost money. When the light is off you don't need CO2, so during flowering, you will use half as much if you have the CO2 solenoid setup to your light timer. When the fan is on for venting, CO2 is shut off as well. This may be up to half the time the light is on, so this will affect the plants exposure times and amount of gas actually dispensed.
    Environmentally, using bottled gas is better, since manufacturing it adds to greenhouse effect, and bottled CO2 is captured as part of the manufacturing process of many materials, and then recycled. Fermenting, CO2 generators, and baking soda and vinegar methods all generate new CO2 and add to greenhouse effect.
    CO2 generation from fermentation and generators is possible. A simple CO2 generator would be a propane heater. This will work well, as long as the gases can be vented to the grow area, and a fan is used to keep the hot CO2 (that will rise) circulating and available below at the plants level. Fire and exhaust venting of the heat are issues as well. A room that must be vented 50% of the time to rid the environment of heat from a lamp and heater will not receive as much CO2 as a room that can be kept unvented for hours at a time. However, CO2 generators are the only way to go for large operations.
    Fermentation or vinegar over baking soda will work if you don't have many vent cycles, but if you have enough heat to make constant or regular venting necessary, these methods become impractical. Just pour the vinegar on baking soda and close the door, (you lose your CO2 as soon as the vent comes on). This method leaves a great deal to be desired, since it is not easy to regulate automatically, and requires daily attention. It is possible however, to create CO2 by fermentation, let the wine turn to vinegar, and pour this on baking soda. It's the most cost-effective setup for most closet growers, for whom $400 in CO2 equipment is a bit much to swallow.
    In fermentation, yeast is constantly killing itself; it takes a lot of space. You need a big bin to constantly keep adding water to, so that the alcohol levels will not rise high enough to kill the yeast. Sugar is used quickly this way, and a 10 pound sack will run $3.50 or so and last about 2-3 weeks. This is also difficult to gauge what is happening as far as amounts actually released. A tube out the top going into a jar of water will bubble and demonstrate the amount of CO2 being produced.
    Try sodium bicarbonate mixed with vinegar, 1 tsp: ~30cc- this will gush up all frothy as it releases CO2. do it just before you close the door on your plants. A MUCH cheaper way to provide CO2 is 2 Oz sugar in 2 liters of water in a bottle [sterilized 1st with bleach and water, then rinsed], plus a few cc urine[!] or if you insist, yeast nutrient from a home brewing supplier. Add a brewing yeast, shake up and keep at 25 deg celsius[~70 F] . Over next 2 weeks or so it will brew up about 1/2 Oz CO2 for every Oz sugar used. Keep a few going at once, starting a new one every 3 days or so. With added CO2 growth is phenomenal!!! I personally measured 38cm growth in 8 days under a 250watt HPS bulb[tubular clear, Horizontal mount.
    A good container is a 1 gallon plastic milk jug, with a pin-hole in the cap. Also, the air-lock from a piece of clear tube running into a jar filled with water will keep microbes out and demonstrate the fermentation is working.
    A variation is to spray seltzer water on the plants twice a day. This is not recommended by some authorities, and receives great raves by people who seem to feel it has enhanced their crop. It stands to reason this would work for only a small unvented closet, but may be right for some situations. It could get expensive with a lot of plants to spray. Use seltzer, not club soda, since it contains less sodium that could clog the plants stomata. Wash your plants with straight water after 2 or 3 seltzer sprays. It's a lot of work, and you can't automate it, but maybe that's good! Remember, being with the plants is a beautiful experience, and brings you closer to your spiritual self and the earth. Seltzer is available at most grocery stores (I get it at Lucky's @ .79 for a 2 litter bottle). Club soda will work if seltzer water is not available; but it has twice as much sodium in it. A very diluted solution of Miracle Grow can be sprayed on the plant at the same time. One factor of using selzter water is it raises humidity levels. Make sure your venting humidity during the dark cycle, or you could risk fungus and increased internode length.
    CAUTION: Don't spray too close to a hot bulb! Spray downward only, or turn off the lamp first.
    Even though CO2 enrichment can mean 30-100% yield increases, the hassle, expense, space, danger, and time involved can make constant or near constant venting a desirable alternative to enrichment. As long as the plant has the opportunity to take in new CO2 at all times, from air that is over 200 ppm CO2, the plants will have the required nutrients for photosynthesis. Most closets will need new CO2 coming in every two or three hours, minimum. Most citys' will have high concentrations of CO2 in the air, and some growers find CO2 injection unnecessary in these circumstances.
    Some growers have reported to High Times that high CO2 levels in the grow room near harvest time lower potency. It may be a good idea to turn off CO2 2 weeks before harvesting.

    Cannabis growing guide from DOPEQUEST
    Dream Team likes this.

    sikballplaya23 Active Member

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    Ralphie Well-Known Member

    cool thanks for this method

    do you use this your self?

    What should I do, just put this near the plants and change bi weekly?

    Ralphie Well-Known Member

    thanks alot... alot of good info here

    LURP Well-Known Member

    Im using fermentation and have a candle in there as well the candle is burning real low very littlO2 to keep it going

    FilthyFletch Mr I Can Do That For Half

    [email protected] injection get a 20lb co2 tank a timer and electronic solenoid and some hose.Set it up for your room size then have it kick on with the timer good to go or get a co2 generator and propane tank

    Ralphie Well-Known Member

    I am in new york and the outside airs CO2 levels are pretty high.. I googled it and got this:

    "CO2 levels are ideal around 270
    ppm (parts per million) but we have now reached 390ppm."

    I'm growing indoors, however i have a screenned window cracked right next to the plants..

    Do you think this will help me as well?

    FilthyFletch Mr I Can Do That For Half

    you will need confines are with a ppm of co2 around 1500 ppm.You need the temps higher between 85-90 degrees F and make sure its in a sealed area and fans and exhaust are off

    AzGrOw-N-sMoKe New Member

    what fithy is talking about is the proper way to do co2 production..but if you cant aforrd this or its to much of a hassel for a newb grower..go with the gallon method i had suggested...an yes i use it to add extra co2...you need to shake the jug a couple times a day an use more then one jug if you can...place the jugs infront of fans if possible....

    Ralphie Well-Known Member

    is this safe to breathe?

    AzGrOw-N-sMoKe New Member

    not really...but you wont have enough to be deadly..

    Ralphie Well-Known Member

    thanks for the info.. do you use CO2 during veg, or flowering only?

    hero1c Member

    no. not at all
    green thumb matt

    green thumb matt Active Member

    get a party cup and poke a hole in the bottom. Get some string for a wick then tie it at one end. Place the wick into the cup leaving the knot on the inside pointing down. get an other cup half the size and fill that one with vinegar and the first one with baking soda. place it above the plants because CO2 sinks

    maryjanedallas Member

    Vinegar and baking soda in a plastic jug. Keep the lid on, Co2 builds up inside over the course of several days. Open the lid as near your plants as possible for an hour a day, then replace the cap, shake up and repeat. This is the method I've used and it's very beneficial.
    Be sure to buy DISTILLED vinegar, for if it doesn't say distilled on the label it is likely a man-made substance consisting mostly of petroleum and can kill your plants.
    Distilled is pretty much as organic as you can get for Co2.

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