Orchids are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Lupins are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A worker arranges daffodils during the final day of preparations for the RHS Chelsea Flower Show in London, Britain May 19, 2019.

A woman poses with the 'A Gardeners Eye' installation inside a pod on the London Eye ahead of the Royal Chelsea Flower Show in London, Britain May 17, 2019.

A worker prepares a display of Alium during the final day of preparations at the RHS Chelsea Flower Show in London, Britain May 19, 2019.

A model poses with body art and headwear made of Peonies at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A woman photographs a floral headdress design at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A Chelsea Pensioner smells a Rose at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Daffodils are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A rose is seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019. Image used for illustrative purpose.

Foxgloves are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019. REUTERS/Toby Melville

Delphiniums are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Gladioli are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Lupins are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A worker arranges flowers during the final day of preparations for the RHS Chelsea Flower Show in London, Britain May 19, 2019.

Two Chelsea Pensioners walk past a floral display based on children's television programs at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A visitor passes a display of Daffodils at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Lilies are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Britain's Queen Elizabeth II is shown around 'Back to Nature' by the designer, Catherine Duchess of Cambridge at the Chelsea Flower Show in London, Britain May 20, 2019. Geoff Pugh/Pool via REUTERS

A visitor passes a display of Lupins at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A visitor wears a themed hat at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A visitor passes a display of Lupins at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019. REUTERS/Toby Melville

An exhibitor poses in a Cactus design jacket at her stand at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

A peony is seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.

Britain's Queen Elizabeth II, is shown around 'Back to Nature' by Prince William and Catherine Duchess of Cambridge at the Chelsea Flower Show in London, Britain May 20, 2019. Geoff Pugh/Pool via REUTERS

Foxgloves are seen on display at the RHS Chelsea Flower Show at the Royal Hospital Chelsea, London, Britain, May 20, 2019.