Introduction to ancient magnolia flowers and trees: Beichuan is the origin of traditional Chinese medicine magnolia flowers, and Yaowang Valley has the largest ancient magnolia flower tree forest in the world. The tree is tall, with two trunks hugging each other, and a crown width of 20 to 30 meters. Every year from March to April, mango flowers bloom all over the mountain, with colors ranging from white, pink, red, and purple. They form a momentum along the mountain and are a wonder.