I have an incredibly happy sundew that doesn’t mind the colder temperatures by my windows in the winter at all.

I took a big round-bottom flask, threw in some wet sphagnum moss, added the sundew, and capped it with parafilm. Zero upkeep besides an occasional turn and it’s thrown up multiple flowers. It’s an artificial marsh with the sun causing the water to circulate and keep the humidity high while it’s quite low outside the flask.

This has worked well for other carnivorous plants too…until a cat decides to yeet itself onto that window ledge and knocks everything over.