Published 25 days ago

Plants need CO2 like we need oxygen. Fact. CO2 + H2O + light = photosynthesis Without carbon dioxide, plants can’t photosynthesise. In fact, if your CO2 level drops below 200ppm, plants won’t grow at all. But how much CO2 is enough? When should you add CO2? How do you add CO2 to a grow room? Here’s what you need to know.