Hi there! We do not have any rules that detain you from having organics on your plot. We of course do not accept pixel art alone. As long as your organics are incorporated well into the plot you should be fine. Remember no pixel art is allowed.
Mk, I was talking to Temperance and they were saying that grading is based on, 50% Structure & 50% Terrain. And that there wasn't any room for organics. Thank you for clearing that up.