` :It is not really known how or exactly when did the Chrysanthemum even became the symbol for the imperial family. However, there are some sources that explained how the Chrysanthemum became the symbol for the family, though the validity is not known. Generally, it is said that the Chrysanthemum was valued and cherished for its ``longevity`` after it was imported from China in the Heian Period, and the imperial family came to love the flower and decided to adopt it as their symbol.   `