I'm going to engage into making florariums (a garden in the bottle). I've heard, that violets die in closed space. Do anyone have an idea, what is the reason for that? Lack of oxygen or CO2 or moisture control issues?
I believe it is because of the violets' propensity to collect mould. They seem to like warm, humid space, but in a closed-air type system, it is a breeding ground for mould.
There could be another reason as to why they die, but I would assume it would be an infection.