Thank you Camille, that's great to know.
I plan on visiting Utrecht next month, that would be awesome if they were to hold an event
Regarding rents, that's unfortunately very true...
Orchidtinkerer - If you ever find the article about that water cooled greenhouse, by all means please share it! I'm having a hard time imagining how it worked.
It indeed gets complicated with all those different heat sources, wattage etc.
I was thinking of putting a heating cable into the drainage layer of a terrarium and see how it goes.
Thankfully they're not crazy expensive so it's worth a try.
DC - They're in pots, big chunks of bark and charcoal, a few Sphagnum fibres.
I pierced holes in the pots, threaded fishing wire, and hung them to the curtain rod using fishing hooks. Ugly but effective!
Seeing all the beautiful plants y'all have in S/H, I'm heavily considering making the switch though.
The mortar tub idea is brilliant, I'll have to look into that