In the maize fields of Nabogame, another plant that is allowed to grow in with the plants is teosinte, the wild ancestor of corn.
Teosinte is a wild grass that is native to Mexico and Central America. It is considered to be the wild ancestor of corn, and it is still found growing in the maize fields of Nabogame.
So, Teosinte is allowed to grow in with the maize plants because it does not compete with the maize for resources. In fact, it can actually benefit the maize plants by providing them with shade and protection from pests.