To build on the notion of beauty as transience, the choice of a cherry tree has additional, symbolic meanings depending on one’s cultural background. However, in general cherry trees symbolize the beauty and brevity of life because their flowers are so short lived. As a symbol, the cherry blossoms can teach us to appreciate each moment, emphasize new beginnings, or glorify nature’s bounty.
The color white is generally symbolic of innocence, purity, and peace. For example, in the Christian tradition, children wear white when they are baptized and confirmed into the Church. Notice that the speaker is interpreting nature through a Christian lens.