Cherry blossoms are seen during the Sakura Matsuri floral display at the Flower Dome at Gardens by the Bay in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

A visitor wearing a face mask as a preventive measure against the coronavirus disease (COVID-19) outbreak reviews a photo on her smartphone after photographing cherry blossoms during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Visitors wearing face masks as a preventive measure against the coronavirus disease (COVID-19) outbreak look at a scale model of a traditional Japanese Gassho-style farmhouse during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

The interior of a cherry blossom themed autonomous vehicle is seen during the Sakura Matsuri floral display at the Flower Dome at Gardens by the Bay in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Cherry blossoms are seen during the Sakura Matsuri floral display at the Flower Dome at Gardens by the Bay in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Cherry blossoms are seen during the Sakura Matsuri floral display at the Flower Dome at Gardens by the Bay in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Cherry blossoms are seen during the Sakura Matsuri floral display at the Flower Dome at Gardens by the Bay in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Visitors check out a cherry blossom themed autonomous vehicle on display during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

A visitor poses for a photograph under cherry blossoms and faux tori gates during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Visitors chat while looking at scale models of traditional Japanese Gassho-style farmhouses and cherry blossoms from afar during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

Visitors review and have their photos taken under faux tori gates during the Sakura Matsuri floral display at the Flower Dome of Gardens by the Bay, as tourism takes a decline following the coronavirus outbreak in Singapore, March 6, 2020. Picture taken March 6, 2020. REUTERS/Loriene Perera

A woman attends a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

A woman attends a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe runs on his way to greet guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe poses with guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe and his wife Akie pose with guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe and his wife Akie pose with guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe's wife Akie greets guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe greets guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe runs on his way to greet guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe poses with guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

Japan's Prime Minister Shinzo Abe poses with guests during a cherry blossom viewing party at Shinjuku Gyoen park in Tokyo, Japan, April 13, 2019. REUTERS/Kim Kyung-hoon

People enjoy cherry blossoms in Washington, U.S., April 8, 2019. REUTERS/Jeenah Moon

People enjoy cherry blossoms in Washington, U.S., April 8, 2019. REUTERS/Jeenah Moon

People enjoy cherry blossoms in Washington, U.S., April 8, 2019. REUTERS/Jeenah Moon

People enjoy cherry blossoms in Washington, U.S., April 8, 2019. REUTERS/Jeenah Moon

People enjoy cherry blossoms in Washington, U.S., April 8, 2019. REUTERS/Jeenah Moon

The U.S. Capitol is seen through cherry blossoms in Washington, U.S., April 3, 2019. REUTERS/Joshua Roberts

A couple rides a boat underneath cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon TPX IMAGES OF THE DAY

A couple rides a boat underneath cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon

A couple rides a boat nearby cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon

A family poses in front of cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon

A couple rides a boat near cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon

A woman poses with her pet dog in front of cherry blossoms in full bloom in Tokyo, Japan, April 3, 2019. REUTERS/Kim Kyung-hoon

The Jefferson Memorial is seen through cherry blossoms along the Tidal Basin as thousands of people flock to see the annual blooms in Washington, U.S., March 31, 2019. Photo taken March 31, 2019. REUTERS/Will Dunham

Tourists take photos among the cherry blossom trees along the Tidal Basin as thousands of people flock to see the annual blooms in Washington, U.S., March 31, 2019. Photo taken March 31, 2019. REUTERS/Will Dunham

Tourists pose for pictures among the cherry blossom trees along the Tidal Basin as thousands of people flock to see the annual blooms in Washington, U.S., March 31, 2019. Photo taken March 31, 2019. REUTERS/Will Dunham

Cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

People sit by the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A man walks with his dog in a backpack along the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A woman paints a piece as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A statue of the civil rights leader Martin Luther King Jr. is seen as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

The White House is see as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A woman sits by the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A woman takes pictures along the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

People walk along the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

People walk along the Tidal Basin as cherry blossoms begin to bloom in Washington, U.S., March 29, 2019. REUTERS/Carlos Barria

A visitor takes a photo under illuminated cherry blossoms in full bloom at Ueno Park in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato REUTERS/Issei Kato

A visitor takes a photo under illuminated cherry blossoms in full bloom at Ueno Park in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato REUTERS/Issei Kato

Visitors take photos under illuminated cherry blossoms in full bloom at Ueno Park in Tokyo, Japan March 28, 2019. REUTERS/Issei Kato REUTERS/Issei Kato

A woman poses for a photograph in front of cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato TPX IMAGES OF THE DAY

A man looks at cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato TPX IMAGES OF THE DAY

A man looks at cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

People look at cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

A woman takes pictures of cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

A woman poses for a photograph in front of cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

People look at cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

A woman takes pictures of cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

A man takes pictures of cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato

A man looks at cherry blossoms in almost full bloom in Tokyo, Japan, March 27, 2019. REUTERS/Issei Kato