Harry and Meghan paid touching tribute to Princess Diana on their wedding day

Prince Harry and Meghan exchanged their vows at St. George's Chapel over the weekend and paid subtle tribute to Harry's mother, the late Princess Diana.

The official florist for their special day was Philippa Craddock, who incorporated Diana's favorite flower - white roses - into the flower arrangements. Peonies are Meghan's favorite flower.

Kensington Palace announced on Twitter that Craddock 'will use flowers and plants that are in season [...] including branches of beech, birch, and hornbeam, as well as white garden roses, peonies, and foxgloves.'

Most of the flowers were taken from the gardens and parkland of the Crown Estate, as well as the gardens at Windsor Great Park.

As reported by People, a temporary garden was opened to members of the public in 2017 to celebrate the 20 year anniversary of Diana's passing.

It was known as the White Garden and occupied a special place on the Kensington Palace grounds known as the 'sunken garden.'

According to the Royal family's official website, it was essential to garden keeper John Anderson and his team to source locally, and for the chapel arrangements to "reflect the landscape that's around Windsor Castle."

All the plants and flowers used were pollinator friendly to attract bees and butterflies, in an attempt to keep the biodiverse ecosystems healthy and balanced.

After the ceremony, Meghan placed her bouquet on the grave of the Unknown Warrior at Westminster Abbey as per the Royal tradition.

The tradition was started nearly a 100 years ago by Lady Elizabeth Bowes-Lyon, the Queen Mother, who placed her bouquet on the grave before entering the church.

She did it in remembrance of her brother Fergus, who died in combat during World War I, as well as all the many and often nameless soldiers whose lives were cut short.

Since then, many Royal brides have honored the tradition by placing their flowers on the Warrior's grave after their official wedding ceremony.