Introduction to Millennium Lagerstroemia: Lagerstroemia is the city flower of Tai'an. It symbolizes beauty and good luck. The Millennium crape myrtle garden is a theme park with flowers that bloom for a hundred days and are as gorgeous as the clouds. There are more than 1,000 crape myrtle trees, 5 of which are over 500 years old, and nearly 300 that are over 100 years old.