The Duchess of Sussex has followed the poignant royal tradition of having her wedding bouquet left at the grave of the Unknown Warrior at Westminster Abbey.

The resting place holds the remains of a World War II soldier who has come to symbolise Britain’s war dead.

The late Queen Mother began the long-standing tradition in 1923 when her posy was left at the grave following her wedding to the Duke of York, later King George VI.

She left the flowers in memory of her brother Fergus, who was killed in 1915 during the conflict.

Convention dictates that the day after royal weddings the floral tribute is sent to the Abbey once the official wedding pictures of the bride and groom have been taken.

Markle’s bridal bouquet which has been tied with a delicate pink ribbon, and includes scented sweet peas, as well as jasmine and lily of the valley, has been placed at the bottom of the grave, and will stay in place until it wilts.

The Duchess of Sussex has sent the bouquet she carried during yesterday's #RoyalWedding to Westminster Abbey to rest on the Grave of the Unknown Warrior. More: https://t.co/pdFnYO1S49 @KensingtonRoyal @RoyalFamily pic.twitter.com/TnrCEl4M4u

— Westminster Abbey (@wabbey) May 20, 2018

The Duke of Sussex and his new bride remembered the late Diana, Princess of Wales, at their wedding by also selecting forget-me-nots, her favourite flowers, for the bouquet.

Harry also contributed by hand-picking several flowers from their private garden at Kensington Palace a day ahead of Saturday’s wedding, the palace said.

Myrtle sprigs from stems planted at Osborne House on the Isle of Wight by Queen Victoria in 1845 also featured, furthering another long-standing tradition.

Sprigs were also used from a plant grown from the myrtle in the Queen’s wedding bouquet in 1947.

The rest of the beautiful flowers that graced the royal wedding have been shared out to different charities.

The news comes as royal stylist Serge Normant says the Duchess of Sussex was a calm and chatty bride-to-be, with no signs of nerves on her wedding morning.

Just hours before she emerged onto the steps of St George’s Chapel to a worldwide audience, Markle appeared relaxed, Normant said.

A first kiss #RoyalWedding pic.twitter.com/EWJO22iWLh

— The Prince and Princess of Wales (@KensingtonRoyal) May 19, 2018

“She was calm, yeah. Chatty, absolutely. We were definitely having exchanges, yeah for sure,” he said.

“She was very happy. It was a beautiful morning, just the perfect morning to get married.”

Asked if there were any nerves, the Paris-born hairdresser said: “No I don’t think so, she was just very happy, very happy, very excited.”

That morning had been “just one of those dreamy moments”, he said.

-with AAP