A farmer carries chrysanthemum flowers from his field for sale during the coronavirus disease (COVID-19) outbreak in Hanoi, Vietnam April 22, 2020. REUTERS/Kham

Fresh chrysanthemum flowers, a traditional Chinese funeral flower, lie on the banks of the Yangtze River on the eve of the Tomb-sweeping Festival in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, in Wuhan ,China, April 3, 2020. REUTERS/Aly Song

Japan's Emperor Naruhito and Empress Masako attends the enthronement ceremony where he officially proclaims his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako attends the enthronement ceremony where he officially proclaims his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

Japan's Emperor Naruhito attends the enthronement ceremony where he officially proclaims his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

Emperor Naruhito delivers his speech as Empress Masako attends the enthronement ceremony where the emperor officially proclaims his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

Emperor Naruhito delivers his speech during the enthronement ceremony where the emperor officially proclaims his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

Japan's Empress Masako attends the end of the enthronement ceremony where Emperor Naruhito officially proclaimed his ascension to the Chrysanthemum Throne at the Imperial Palace in Tokyo, Japan, October 22, 2019. Kazuhiro Nogi/Pool via REUTERS

The Imperial chrysanthemum emblem is displayed on the body of a special convertible car, custom model of Toyota Motor's Century sedan, which will be used for Japanese new Emperor Naruhito and Empress Masako's parade after the enthronement ceremony of Emperor Naruhito on October 22, 2019, is displayed during a press preview at the Imperial Palace in Tokyo, Japan October 7, 2019. REUTERS/Issei Kato

The Imperial chrysanthemum emblem is displayed on the body of a special convertible car, custom model of Toyota Motor's Century sedan, which will be used for Japanese new Emperor Naruhito and Empress Masako's parade after the enthronement ceremony of Emperor Naruhito on October 22, 2019, is displayed during a press preview at the Imperial Palace in Tokyo, Japan October 7, 2019. REUTERS/Issei Kato

The Imperial chrysanthemum emblem is displayed on the body of a special convertible car, custom model of Toyota Motor's Century sedan, which will be used for Japanese new Emperor Naruhito and Empress Masako's parade after the enthronement ceremony of Emperor Naruhito on October 22, 2019, is displayed during a press preview at the Imperial Palace in Tokyo, Japan October 7, 2019. REUTERS/Issei Kato

Visitors pose in front of mannequins dressed in chrysanthemums in the likeness of Japanese traditional attire during the Sakura Matsuri Floral Display at Gardens by the Bay in Singapore, March 18, 2019. Picture taken March 18, 2019. REUTERS/Loriene Perera

People use their smartphones as they walk past Senrinzaki (Thousand Blooms) chrysanthemum arrangements during the Dahlia Dreams floral display which celebrates the upcoming Lunar New Year of the Pig at Gardens by the Bay in Singapore, January 24, 2019. REUTERS/Loriene Perera

Chrysanthemum plants are seen on the eve of All Saints Day in Paris, France, October 31, 2018. REUTERS/Benoit Tessier

A girl runs among chrysanthemums during a flower show at the Nikitsky Botanical Garden outside Yalta, Crimea October 29, 2018. REUTERS/Pavel Rebrov

A girl is seen among chrysanthemums during a flower show at the Nikitsky Botanical Garden outside Yalta, Crimea October 29, 2018. REUTERS/Pavel Rebrov

A florist adjusts Chrysanthemums on display at a flower shop a week before Toussaint (All Saints Day) in Montcaret near Bordeaux, France, October 24, 2018. REUTERS/Regis Duvignau

A display of Chrysanthemums are seen at a flower shop a week before Toussaint (All Saints Day) in Montcaret near Bordeaux, France, October 24, 2018. REUTERS/Regis Duvignau

A florist adjusts Chrysanthemums on display at a flower shop a week before Toussaint (All Saints Day) in Montcaret near Bordeaux, France, October 24, 2018. REUTERS/Regis Duvignau

A florist adjusts Chrysanthemums on display at a flower shop a week before Toussaint (All Saints Day) in Montcaret near Bordeaux, France, October 24, 2018. REUTERS/Regis Duvignau

A display of Chrysanthemums are seen at a flower shop a week before Toussaint (All Saints Day) in Montcaret near Bordeaux, France, October 24, 2018. REUTERS/Regis Duvignau

A visitor takes photo of the Imperial chrysanthemum emblem at the Yasukuni Shrine in Tokyo, Japan Octber 17, 2018. REUTERS/Issei Kato

A display of Chrysanthemum are seen at the RHS Chelsea Flower Show in London, Britain, May 21, 2018. REUTERS/Toby Melville

Chrysanthemums sit on display ahead of RHS Chelsea Flower Show in London, Britain May 20, 2018. REUTERS/Simon Dawson

Chrysanthemums sit on display ahead of RHS Chelsea Flower Show in London, Britain May 20, 2018. REUTERS/Simon Dawson

A worker adjusts chrysanthemums on a display as he prepares for the RHS Chelsea Flower Show in London, Britain May 20, 2018. REUTERS/Simon Dawson TPX IMAGES OF THE DAY

A worker adjusts chrysanthemums on a display as he prepares for the RHS Chelsea Flower Show in London, Britain May 20, 2018. REUTERS/Simon Dawson

A worker adjusts chrysanthemums on a display as he prepares for the RHS Chelsea Flower Show in London, Britain May 20, 2018. REUTERS/Simon Dawson

Staff take chrysanthemum flowers from an altar for the war dead to distribute to attendees after a memorial ceremony marking the 72nd anniversary of Japan's surrender in World War Two, at Budokan Hall in Tokyo, Japan August 15, 2017. REUTERS/Kim Kyung-Hoon

Staff take chrysanthemum flowers from an altar for the war dead to distribute to attendees after a memorial ceremony marking the 72nd anniversary of Japan's surrender in World War Two, at Budokan Hall in Tokyo, Japan August 15, 2017. REUTERS/Kim Kyung-Hoon

Japan's Prime Minister Shinzo Abe walks away after offering a chrysanthemum flower to the war dead during a memorial ceremony marking the 72nd anniversary of Japan's surrender in World War Two, at Budokan Hall in Tokyo, Japan August 15, 2017. REUTERS/Kim Kyung-Hoon

Japan's Prime Minister Shinzo Abe bows after offering a chrysanthemum flower to the war dead during a memorial ceremony marking the 72nd anniversary of Japan's surrender in World War Two, at Budokan Hall in Tokyo, Japan August 15, 2017. REUTERS/Kim Kyung-Hoon

A display by the National Chrysanthemum Society is seen at the RHS Chelsea Flower Show in London, Britain, May 23, 2017. REUTERS/Neil Hall SEARCH "CHELSEA BLOOM" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A display by the National Chrysanthemum Society is seen at the RHS Chelsea Flower Show in London, Britain, May 23, 2017. REUTERS/Neil Hall SEARCH "CHELSEA BLOOM" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A display by the National Chrysanthemum Society is seen at the RHS Chelsea Flower Show in London, Britain, May 23, 2017. REUTERS/Neil Hall SEARCH "CHELSEA BLOOM" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

A display by the National Chrysanthemum Society is seen at the RHS Chelsea Flower Show in London, Britain May 23, 2017. REUTERS/Neil Hall

A display by the National Chrysanthemum Society is seen at the RHS Chelsea Flower Show in London, Britain May 23, 2017. REUTERS/Neil Hall

A Chrysanthemum is displayed at the Royal Horticultural Society's Chelsea Flower show in London, Britain, May 22, 2017. REUTERS/Dylan Martinez

A Chrysanthemum is displayed at the Royal Horticultural Society's Chelsea Flower show in London, Britain, May 22, 2017. REUTERS/Dylan Martinez

A National Chrysanthemum Society exhibit is displayed at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

A National Chrysanthemum Society exhibit is displayed at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

An exhibit by the National Chrysanthemum Society is displayed at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

An exhibit by the National Chrysanthemum Society is displayed at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

An exhibitor prepares a display by the National Chrysanthemum Society at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

An exhibitor prepares a display by the National Chrysanthemum Society at the RHS Chelsea Flower Show in London, Britain May 21, 2017. REUTERS/Neil Hall

Japanese Prime Minister Shinzo Abe holds a chrysanthemum to offer for the victims of the March 11, 2011 earthquake and tsunami during the national memorial service in Tokyo, Saturday, March 11, 2017. REUTERS/Koji Sasahara/Pool

A visitor walks near the Imperial chrysanthemum emblem at the Yasukuni Shrine in Tokyo, Japan, December 29, 2016. REUTERS/Toru Hanai

A woman adjusts display of chrysanthemums during preparations for the RHS Chelsea Flower Show in London, Britain May 21, 2016. REUTERS/Neil Hall

A man adjusts a display of chrysanthemums during preparations for the RHS Chelsea Flower Show in London, Britain May 21, 2016. REUTERS/Neil Hall

A woman holding white chrysanthemum stands in front of a gravestone of her deceased relative during Qingming Festival or Tomb Sweeping Day at a cemetery in Beijing, China April 2, 2016. REUTERS/Jason Lee

Japan's Prime Minister Shinzo Abe holds chrysanthemums as an offering for the victims of the March 11, 2011 earthquake and tsunami at the national memorial service in Tokyo, Japan, March 11, 2016. Japan on Friday mourned the thousands who lost their lives in a massive earthquake and tsunami five years ago that turned towns to matchwood and triggered the world's worst nuclear disaster since Chernobyl in 1986. REUTERS/Kazuhiro Nogi/Pool

Relatives of victims of the March 11, 2011 earthquake and tsunami offer chrysanthemums for the victims during the national memorial service in Tokyo, Japan, March 11, 2016. Japan on Friday mourned the thousands who lost their lives in a massive earthquake and tsunami five years ago that turned towns to matchwood and triggered the world's worst nuclear disaster since Chernobyl in 1986. REUTERS/Kazuhiro Nogi/Pool

A woman holding chrysanthemums waits to enter the French Embassy for a memorial tribute to the victims of Friday's attacks in Paris, in Beijing, China, November 15, 2015. REUTERS/Jason Lee

A man, holding chrysanthemums, waits to enter the French Embassy for a memorial tribute to the victims of Friday's attacks in Paris, in Beijing, China, November 15, 2015. REUTERS/Jason Lee

Japan's Prime Minister Shinzo Abe bows after offering a chrysanthemum flower to the war dead during a memorial service ceremony marking the 70th anniversary of Japan's surrender in World War Two at Budokan Hall in Tokyo August 15, 2015. Japanese Emperor Akihito marked the 70th anniversary of the end of World War Two with an expression of "deep remorse" over the conflict on Saturday, a departure from his annual script which could be seen as a subtle rebuke of conservative Prime Minister Abe. REUTERS/Toru Hanai

A Chelsea Pensioner takes a photograph of a Chrysanthemum display at the Royal Horticultural Society's Chelsea Flower Show in London, Britain May 19, 2015. REUTERS/Suzanne Plunkett

A synchronized swimmer wears a hat made out of 800 chrysanthemums each at the M & G Retreat garden at the Royal Horticultural Soceity's Chelsea Flower Show in London, Britain, May 18, 2015. REUTERS/Toby Melville

Synchronized swimmers wear hats made out of 800 chrysanthemums each at the M & G Retreat garden at the Royal Horticultural Soceity's Chelsea Flower Show in London, Britain, May 18, 2015. REUTERS/Toby Melville

Three synchronized swimmers wear hats made out of 800 chrysanthemums each at the M & G Retreat garden at the Royal Horticultural Soceity's Chelsea Flower Show in London, Britain, May 18, 2015. REUTERS/Toby Melville