I've noticed that Victoria that some green plant on her hair then I found out that it is Danish/Swedish royal tradtion to hide a green myrtle in your veil.
The story behind the green plant is; When Princess Margaret of Connaught married Prince Gustaf (VI) Adolf in 1905, she brings a myrtle-plant to Sweden, from England.
Both her mother, Princess Margaret Luise of Prussia, and Margaret herself wore myrtle as decorations on their wedding dresses. The plant as Sweden's new princess took to the new country were planted since the Prince couple's summer residence Sofiero in the southern part of Sweden.
When Margaret's daughter, Ingrid, then married the Danish Crown Prince Frederik she wanted to celebrate the tradition of myrtle tied to the bride in any way.
At their wedding in the Cathedral in May 1935 bore Princess Ingrid a specially bound bridal crown of myrtle. Denmark's new crown princess and later queen, then took with him a plant from his mother's myrtle in Sweden, which she planted in the gardens at Fredensborg Palace.
Since then, the historical tradition handed down by Danish and Swedish royal brides who had myrtle in their veils and bridal bouquets.
Here is a picture: