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Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017. The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017.
The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS        (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

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Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017. The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017.
The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS        (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

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LONDON, ENGLAND - MAY 22: Queen Elizabeth II meets Mary Berry at the BBC Radio 2 Garden at the RHS Chelsea Flower Show press day at Royal Hospital Chelsea on May 22, 2017 in London, England. The prestigious Chelsea Flower Show, held annually since 1913 in the Royal Hospital Chelsea grounds, is open to the public from the 23rd to the 27th of May, 2017. (Photo by Julian Simmonds - WPA Pool / Getty Images)

LONDON, ENGLAND - MAY 22:  Queen Elizabeth II meets Mary Berry at the BBC Radio 2 Garden at the RHS Chelsea Flower Show press day at Royal Hospital Chelsea on May 22, 2017 in London, England. The prestigious Chelsea Flower Show, held annually since 1913 in the Royal Hospital Chelsea grounds, is open to the public from the 23rd to the 27th of May, 2017.  (Photo by Julian Simmonds - WPA Pool / Getty Images)

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Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017. The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

Britain's Queen Elizabeth II visits the Chelsea Flower Show in London on May 22, 2017.
The Chelsea flower show, held annually in the grounds of the Royal Hospital Chelsea, opens to the public this year from May 22. / AFP PHOTO / POOL / JULIAN SIMMONDS        (Photo credit should read JULIAN SIMMONDS/AFP/Getty Images)

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LONDON, ENGLAND - MAY 22: Queen Elizabeth II is presented with a posy by Caitlyn James a Y6 from Swansea during her visit to the RHS Chelsea Flower Show press day at Royal Hospital Chelsea on May 22, 2017 in London, England. The prestigious Chelsea Flower Show, held annually since 1913 in the Royal Hospital Chelsea grounds, is open to the public from the 23rd to the 27th of May, 2017. (Photo by Julian Simmonds - WPA Pool / Getty Images)

LONDON, ENGLAND - MAY 22:  Queen Elizabeth II is presented with a posy by Caitlyn James a Y6 from Swansea during her visit to the RHS Chelsea Flower Show press day at Royal Hospital Chelsea on May 22, 2017 in London, England. The prestigious Chelsea Flower Show, held annually since 1913 in the Royal Hospital Chelsea grounds, is open to the public from the 23rd to the 27th of May, 2017.  (Photo by Julian Simmonds - WPA Pool / Getty Images)