In the Rocinante's lounge/mess room, we can see a round niche on a wall, containing many plants growing from its edge, as shown here:
And here, partially hidden but less blurred:
What kind of plants are these? Being them located near the fabled coffee machine, so much loved by our hero Jim Holden, at first I thought that they could be coffee plants, but a quick search on Google Images proved that they are quite different. And, we can see that coffee beans are already available in their MCRN branded packages, so there is no need to plant, process and roast them on board:
What plants are these? Are they supposed to have a practical purpose, maybe for cooking? Or are they just decorative, pretty much like your average bowl of petunias? Is the sign "keep this area clean" related to them? And, is there a reason why they are disposed in that particular circular pattern, growing from the edge and converging through the center of the niche?
I don't recall this detail from the books, so this question is mainly about the show, but if the novels give some info feel free to provide them.