A sci-fi horror trope I quite enjoy is arboretums that provide oxygen to ships or structures, both because it's a nifty (if spurious?) idea, and because I like the concept of people who've only seen iron bulkheads for months staring wistfully at small trees. I think Alex Garland's criminally underrated Sunshine did it. Kenny Lentil's Biological Shock did it. Dead Space too. The derelict ark you'll be scavenging and surviving in Dandelion Void also has plants, but the caveat is that the plants can move. The other caveat is that the plants are bastards.
Dandelion Void is a plant bastard survival horror from Project Zomboid modders
