What is sunflower showdown school?

As an AI language model, I don't have any information about a specific school named Sunflower Showdown School. However, "Sunflower Showdown" is a term commonly used to describe a sports rivalry between two universities in Kansas, namely Kansas State University (KSU) and the University of Kansas (KU). The term originated from the state flower of Kansas, the sunflower. The rivalry is most intense in basketball and football games between the two universities, and the winner of these matches earns bragging rights as the dominant team in the state. The Sunflower Showdown is one of the longest-standing rivalries in collegiate sports and is considered one of the best rivalries in the United States.