On: A Sealed Garden That Was Watered Once in 53 Years (2017)

[vvdcect]

Yeah I don't know if you noticed the white patch on the lower part of the terrarium, that to me looks like a mix of the plants root system and mycorrhizal fungi, so there should have been microbes present within the soil when it was first planted.

[jandrese → vvdcect]

There would have to be microbes in the soil breaking it down and releasing CO2 so the plant could get its carbon.