whats a cheap way to supply co2 to my indoor garden?

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    2 Responses to “whats a cheap way to supply co2 to my indoor garden?”

    1. Mike W Says:

      Commercially this is often done by putting engine exhaust into the greenhouse. However they also purify that exhaust very well first which will not be possible in your case. Cylinders of CO2 are available, but not cheap. Dry Ice would be the other possibility.

    2. jerrbearr Says:

      Open a window ? maybe a screened window !

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