At some point in the story Myriel, Hazel and John go on a journey to find Myriel's wife who had been kidnapped soon before baby John had arrived to the planet. Myriel doesn't know that it was a kidnapping at first, but certain things happen that cause him to find out about it.
As they travel around the planet they come upon all sorts of plant creatures that are indigenous to that area. These are cactus creatures and people from a desert area and some flower aliens from another area of the planet. Myriel's city is the main city on the planet a very diverse in its population.
Farm workers, Potato and Corn Aliens. The workers produce fruits and vegetables which gets shipped to different areas of this world for the aliens to buy and eat.