At its current state the greenhouse is pretty but useless and despite that even expensive to build.
Anyhow i recently wanted to build one, but could not (anymore) because it was underground,
i ofc understand that concept wise "greenhouses need to be build under the sun" but durrh.
Would it not be better if we had some more hearthmagic going on, an irrlight maybe in construction cost?
Give us the possibility to build a underground city, a mountainhall with magical shiny greenhouses powerd by irrlights or such...
and maybe just 6 bars of metal and 12 glass pane + the other stuff.
TL;DR: Let Me Build Greenhouses Underground So They Have A Purpose