Sakura and the Hanami tradition

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Hanami (lit. “flower viewing”) is the Japanese traditional custom of enjoying the beauty of flowers, “flower” in this case almost always meaning cherry blossoms or ume blossoms.From the end of March to early May, sakura bloom all over Japan. The blossom forecast is announced each year by the weather bureau, and is watched carefully by those planning hanami as the blossoms only last a week or two. In modern-day Japan, hanami mostly consists of having an outdoor party beneath the sakura during daytime or at night. Hanami at night is called yozakura ( literally night sakura). In many places such as Ueno Park temporary paper lanterns are hung for the purpose of yozakura.
from wikipedia