Yeah, I knew there was one there.Don't remember that ...however, Iowa does have one Apollo 14 moon tree: a sycamore planted at the Iowa State Capitol Building in Des Moines on April 30, 1976.
For those that don't know, there were a pocketful of seeds that rode the Apollo 14 command module, Kitty Hawk, as it orbited the moon. Those seeds after returning to Earth were distributed around the country and planted at numerous locations some of which are college campuses.