Flowers are mentioned a few times in the book, but their significance is more metaphorical than practical:
* Meg's garden: Meg tends to a garden, and the flowers represent her connection to Earth and the natural world, a reminder of the beauty and love she's leaving behind.
* The Happy Medium's flower: The Happy Medium, a supernatural being, uses a beautiful pink flower to demonstrate the power of imagination and positive thinking, which the children need to fight the forces of darkness.
While flowers symbolize beauty and life, they don't serve a concrete purpose in the children's quest to rescue Meg's father. The book focuses on themes of courage, love, and the importance of believing in oneself, which are symbolized by the children's journey and their encounters with different celestial beings.