A woman poses for a picture under cherry blossoms in the park during the coronavirus disease (COVID-19) outbreak, in Riga, Latvia April 21, 2020. REUTERS/Ints Kalnins

A man with a child pose for a picture under cherry blossoms in the park during the coronavirus disease (COVID-19) outbreak, in Riga, Latvia April 21, 2020. REUTERS/Ints Kalnins

People pose for a picture under cherry blossoms in the park during the coronavirus disease (COVID-19) outbreak, in Riga, Latvia April 21, 2020. REUTERS/Ints Kalnins

A woman poses for a picture under cherry blossoms in the park during the coronavirus disease (COVID-19) outbreak, in Riga, Latvia April 21, 2020. REUTERS/Ints Kalnins

A woman is seen under cherry blossoms in the park during the coronavirus disease (COVID-19) outbreak, in Riga, Latvia April 21, 2020. REUTERS/Ints Kalnins

A woman walks by Cherry Blossom as she walks dogs while the spread of the coronavirus disease (COVID-19) continues, Milton Keynes, Britain, April 20, 2020. REUTERS/Andrew Boyers

A Red Panda is pictured eating cherry blossom at Manor Wildlife Park in St Florence. The Park is crowdfunding for food to feed their endangered animals as the spread of coronavirus disease (COVID-19) continues, in St Florence, Wales, Britain, April 15, 2020. REUTERS/Rebecca Naden

A Red Panda is pictured eating cherry blossom at Manor Wildlife Park in St Florence. The Park is crowdfunding for food to feed their endangered animals as the spread of coronavirus disease (COVID-19) continues, in St Florence, Wales, Britain, April 15, 2020. REUTERS/Rebecca Naden

A Red Panda is pictured in cherry blossom at Manor Wildlife Park in St Florence. The Park is crowdfunding for food to feed their endangered animals as the spread of coronavirus disease (COVID-19) continues, in St Florence, Wales, Britain, April 15, 2020. REUTERS/Rebecca Naden

A Red Panda is pictured in cherry blossom at Manor Wildlife Park in St Florence. The Park is crowdfunding for food to feed their endangered animals as the spread of coronavirus disease (COVID-19) continues, in St Florence, Wales, Britain, April 15, 2020. REUTERS/Rebecca Naden

Residents comb through the wreckage of a collapsed house after an Easter Sunday tornado ripped through the Cherry Blossom Drive neighborhood in Monroe, Louisiana, U.S. April 12, 2020. Picture taken April 12, 2020. Nicolas Galindo/The News-Star via USA TODAY NETWORK via REUTERS. TPX IMAGES OF THE DAY

People wearing protective face masks stand under blooming cherry blossoms in a park on Easter Sunday, during the coronavirus disease (COVID-19) outbreak, in the Treptow district in Berlin, Germany April 12, 2020. REUTERS/Michele Tantussi TPX IMAGES OF THE DAY

People walk under blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

A woman takes photos under blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

People walk under blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

People walk under blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

A woman takes photos under blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

People take photos near blooming cherry blossoms in a park in the Berlin district of Treptow on Easter Sunday during the coronavirus disease (COVID-19) outbreak, Germany April 12, 2020. REUTERS/Michele Tantussi

A woman passes cherry blossoms in a street in London, Britain, April 10, 2020. REUTERS/Kevin Coombs

A combination picture shows Heerstrasse, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, crowded with people despite of the lock down, April 5, 2020, and the same spot after the Public Order Office Ordnungsamt closed the access to the district, April 8, 2020, as the spread of the coronavirus disease (COVID-19) continues, in Bonn, Germany. REUTERS/Wolfgang Rattay/Thilo Schmuelgen

The empty Heerstrasse is seen after the Public Order Office Ordnungsamt closed the access to the district, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

The empty Heerstrasse is seen after the Public Order Office Ordnungsamt closed the access to the district, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

A woman wearing a mask to prevent contracting the coronavirus disease (COVID-19) waits for a bus under cherry blossom trees at a stop in Seoul, South Korea, April 8, 2020. REUTERS/Kim Hong-Ji

A dog sits on a balcony after the Public order office Ordnungsamt closed the access to the district, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

A woman takes a picture at the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

Members of the Public order office Ordnungsamt close the access to a district, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

Members of the Public order office Ordnungsamt close the access to a district, known as the Cherry Blossom Area, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

A woman of the Public order office Ordnungsamt monitors the closing of a district, known as the Cherry Blossom district, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany, April 8, 2020. REUTERS/Thilo Schmuelgen

People enjoy the view while practicing social distancing during the global spread of the coronavirus disease (COVID-19), at a cafe near a cherry blossom trees street Seokchon Lake park, in Seoul, South Korea, April 8, 2020. REUTERS/Heo Ran

A cherry blossom trees street is seen cordoned off as part of efforts to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 8, 2020. REUTERS/Heo Ran

The "N Seoul Tower" is seen behind cherry blossoms, amid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 7, 2020. REUTERS/Kim Hong-Ji

A woman takes a selfie with cherry blossoms, amid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 7, 2020. REUTERS/Kim Hong-Ji

A hotel that has been designated to accommodate asymptomatic people and those with light symptoms of the coronavirus disease (COVID-19) to free up hospital beds is seen trow cherry blossom trees in Tokyo, Japan April 7, 2020. REUTERS/Issei Kato

Police patrols through Heerstrasse also known as the Cherry Blossom Avenue, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany April 5, 2020. REUTERS/Wolfgang Rattay

Despite of the lock-down due to the spread of the coronavirus disease (COVID-19), people gather in Heerstrasse also known as the Cherry Blossom Avenue, a magnet for tourists from all over the world during blossom-time, in Bonn, Germany April 5, 2020. REUTERS/Wolfgang Rattay

Despite of the lock-down due to the spread of the coronavirus disease (COVID-19), people gather in Heerstrasse also known as the Cherry Blossom Avenue, a magnet for tourists from all over the world during blossom-time, in Bonn, Germany April 5, 2020. REUTERS/Wolfgang Rattay

Despite of the lock-down due to the spread of the coronavirus disease (COVID-19), people gather in Heerstrasse also known as the Cherry Blossom Avenue, a magnet for tourists from all over the world during blossom-time, in Bonn, Germany April 5, 2020. REUTERS/Wolfgang Rattay

Police patrols through Heerstrasse also known as the Cherry Blossom Avenue, a magnet for tourists from all over the world during blossom-time of the cherry trees, as the spread of the coronavirus disease (COVID-19) continues in Bonn, Germany April 5, 2020. REUTERS/Wolfgang Rattay

A mother and her child take a selfie near a cherry blossom trees street, wearing masks to protect against contracting the coronavirus disease (COVID-19) in Seoul, South Korea, April 3, 2020. REUTERS/Heo Ran

A couple takes a selfie near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A man takes a picture near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

A woman wearing a protective mask pushes a stroller with a dog as she takes a walk near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A couple reacts as they take a walk near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A woman poses for a picture near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A couple takes a walk near a cherry blossom trees street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A woman poses for a picture next to a cherry blossom tree, at a street closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A woman poses for a picture near a cherry blossom street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

People walk near a cherry blossom street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

A couple poses for a picture near a cherry blossom street, closed to avoid the spread of the coronavirus disease (COVID-19), in Seoul, South Korea, April 1, 2020. REUTERS/Kim Hong-Ji

Cherry blossoms are pictured as a woman jogs around Green Lake Park as social-distancing efforts continue to help slow the spread of coronavirus disease (COVID-19) in Seattle, Washington, U.S. March 29, 2020. REUTERS/Jason Redmond TPX IMAGES OF THE DAY

Cherry blossoms are pictured as people jog around Green Lake Park as social-distancing efforts continue to help slow the spread of coronavirus disease (COVID-19) in Seattle, Washington, U.S. March 29, 2020. REUTERS/Jason Redmond

Cherry blossoms are pictured as people walk and jog around Green Lake Park as social-distancing efforts continue to help slow the spread of coronavirus disease (COVID-19) in Seattle, Washington, U.S. March 29, 2020. REUTERS/Jason Redmond

Cherry blossoms are pictured as people walk around Green Lake Park despite social-distancing efforts to help slow the spread of coronavirus disease (COVID-19) in Seattle, Washington, U.S. March 29, 2020. REUTERS/Jason Redmond

A woman wearing a protective face mask, following an outbreak of the coronavirus disease (COVID-19), waits for a trafic signal near blooming cherry blossoms in a snow fall during the first weekend after Tokyo Governor Yuriko Koike (not in picture) urged Tokyo residents to stay indoors in a bid to keep the coronavirus disease from spreading, in Tokyo, Japan March 29, 2020. REUTERS/Issei Kato

A woman wearing a protective face mask, following an outbreak of the coronavirus disease (COVID-19), walks under blooming cherry blossoms in a snow fall during the first weekend after Tokyo Governor Yuriko Koike urged Tokyo residents to stay indoors in a bid to keep the coronavirus disease from spreading, in Tokyo, Japan March 29, 2020. REUTERS/Issei Kato TPX IMAGES OF THE DAY

People walk under blooming cherry blossoms in a snow fall during the first weekend after Tokyo Governor Yuriko Koike urged Tokyo residents to stay indoors in a bid to keep the coronavirus disease (COVID-19) from spreading, at a park in Tokyo, Japan March 29, 2020. REUTERS/Issei Kato

A combination picture shows visitors wearing protective face masks following an outbreak of the coronavirus disease (COVID-19) looking at blooming cherry blossoms March 22, 2020, and a pigeon walking at an closed cherry blossom viewing spot during the first weekend after Tokyo Governor Yuriko Koike (not pictured) urged Tokyo residents to stay indoors, in a bid to keep the coronavirus disease (COVID-19) from spreading, March 28, 2020, at Ueno park in Tokyo, Japan. REUTERS/Issei Kato TPX IMAGES OF THE DAY

People sit on the ground as they enjoy viewing blooming cherry blossoms during the first weekend after Tokyo Governor Yuriko Koike (not pictured) urged Tokyo residents to stay indoors in a bid to keep the coronavirus disease (COVID-19) from spreading, at Ueno park in Tokyo, Japan March 28, 2020. REUTERS/Issei Kato

A pigeon walks at an closed cherry blossom viewing spot during the first weekend after Tokyo Governor Yuriko Koike (not pictured) urged Tokyo residents to stay indoors in a bid to keep the coronavirus disease (COVID-19) from spreading, at Ueno park in Tokyo, Japan March 28, 2020. REUTERS/Issei Kato