Growing Indoor Marijuana Systems Preparing for Growing Indoor Marijuana has its own unique challenges and advantages if you would like to wind up getting the stash of marijuana you have to know. In normal outside air, there is around 350ppm of CO2 available. Plants require CO2 during the process of photosynthesis. For indoor enclosed grow areas plants can use up the CO2 very quickly if proper “fresh” air circulation is not provided. When the CO2 levels drop below 200ppm, plants stop the photosynthesis process and stop growing. In the enclosed…
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