Seed germination in Plumeria is the process by which a seed develops into a new plant. It begins when a mature seed, released from the seedpod, absorbs water and swells. The seed then initiates biochemical changes, activating growth hormones. As the embryo inside the seed develops, it sends out a root (radicle) and a shoot (cotyledon) to emerge from the seed coat. These structures grow into the first roots and leaves of the Plumeria plant, establishing the foundation for its growth and development.