A quick outcast/nomad question.

[Akura]

As far as I am aware Malta is the only place in Sirius that the grass Cardamine is made from grows at. So planet Malta itself is the source of all Cardi. Correct me if I am wrong, but that is how it was in the single player game, and this mod continues from that.

Correct.

The GC have a Planet in their Guard system that grows Cardi, but it's considered non-Canon and being removing in the next version, due to the fact it makes no sense.

Also, a Planet in Omicron-80, has certain parts of land that can grow Cardi, if it's the right conditions.