I mean. What you can or can't gather depends on what people submit, so...

As far as growing your own plants, characters are welcome to try, but it won't be easy! BASE doesn't have much by way of resources for greenhouses and their ilk (there are many reasons you guys are surviving on protein blocks and this is one of them), and the majority of the lifeforms who live on this coelacanth will have a very hard time surviving in poorer conditions. So characters would have to work their asses off to create something close to adequate.