It's true, cherry blossoms do tend to overshadow Japan's other stunning flowers. However, plum ( ume) blossoms - which bloom in late February to signal the start of spring - should not be overlooked. Plum blossoms' reddish, pink, or white flowers remain in bloom until early March, although there's an occasional overlap between late-blooming plum blossoms and early-blooming cherry blossoms, which can lead to some confusion.