A cockatiel drinks the nectar of a Yoko cherry blossom, at Ueno park in Tokyo, Tuesday, March 22, 2016 (AP)

Visitors row boats in the moat surrounding Edo Castle to admire full-bloom cherry blossoms in Tokyo on April 4, 2016 (AFP)

Women take a selfie under cherry blossoms near the national assembly in Seoul on April 4, 2016 (AFP)

A bee near a cherry tree blossom in Rome's E.U.R. neighbourhood, Friday, April 1, 2016 (AP)

A woman poses for a friend in front of a cherry tree that stands in full bloom in the East Garden of the Imperial Palace in Tokyo, Japan, March 25, 2016 (Reuters)

A couple in a rowboat admire full-bloom cherry blossoms in Tokyo on April 4, 2016 (AFP)

View of the flowerbeds and trees on display during the Spring Flowers show in Al-Orman Gardens in Giza, Egypt (Photo: Mai Shaheen)

View of flowerbed at the Spring Flowers show in Al-Orman Gardens in Dokki, Giza, Egypt (Photo: Lamia Hassan)

Women take a selfie under cherry trees on a sunny spring day in Seoul, South Korea, April 5, 2016 (Reuters)

Suzy Dodge, 32, left, and Justin Cook, 35, of Washington, pose for a portrait in advance of their wedding, for photographer Amelia Johnson, under cherry blossoms in bloom at the tidal basin in Washington, Thursday, March 24, 2016 (AP)

People photograph cherry trees in bloom along the tidal basin before dawn in Washington, March 26, 2016 (Reuters)

Cherry trees bloom along the tidal basin before dawn in Washington March 26, 2016 (Reuters)

An Egyptian woman admires the flowers at the Spring Flowers Show in the Orman Gardens in Dokki, Giza, Egypt (Photo: Lamia Hassan)

A woman walks past daffodils on a sunny spring day in St James Park in London, Britain April 2, 2016 (Reuters)