The cherry blossom (sakura) is Japan's unofficial national flower. It has been celebrated for many centuries and holds a very prominent position in Japanese culture.
There are many dozens of different cherry tree varieties in Japan, most of which bloom for just a couple of days in spring. The Japanese celebrate that time of the year with hanami (cherry blossom viewing) parties under the blooming trees.
On Japan's southern, subtropical islands of Okinawa, cherry blossoms open as early as January, while on the northern island of Hokkaido, they bloom as late as May. In most major cities in between, including Tokyo, Kyoto and Osaka, the cherry blossom season typically takes place around the end of March and beginning of April (see table below).
Furthermore, the blooming time differs from year to year depending on the weather. If the weather during the months and weeks preceding the cherry blossom season is mild, blossoms will open early. If it is cold, blossoms will open later. From year to year, the start of the blooming season can vary by as much as two weeks.
