Board Thread:General Discussion/@comment-24145588-20141002185728/@comment-24145588-20141006222625

Even the in-game description, as quoted here on the wiki, says:

"'When a strong breeze blows, the Castanevine really comes to life. Monsters sometimes blow at the plant just to hear it play.'" This also makes it seem like the vine was originally intended to be some sort of wind instrument. Who ever heard of blowing on a castanet to play it?