And the couple have done just that, transforming Windsor Castle into an autumnal wonderland. Here's everything you need to know about the blooms they've picked.
Which flowers have Princess Eugenie and Jack Brooksbank chosen for their wedding?
Eugenie and Jack have opted for a rich autumnal theme, with orange, red and purple blooms adorning St George's Chapel, Windsor Castle.
The displays were created using foliage and flowering branches sourced locally from Windsor Great Park, combined with roses, spray roses, hydrangeas, dahlias and berries.
On the Royal Family's website, it's explained: "The designs will reflect the rich and vibrant tones of autumn and will also include Liquid Amber trees."
Two large arrangements decorate the entrance to the church, while colourful flowers line the stairs that the couple will emerge from after the service.
Who created the floral displays at St George's Chapel?
Floral designer Rob Ven Helden was the one to decorate the venue.
The Dutch florist moved to London 31 years ago, where he started his business from the back of his car.
Now supported by a team – including his sister Patrice Van Helden Oakes – he creates floral designs across the UK and abroad.
Mr Van Helden said: "It has been the greatest privilege and honour to create the flowers for Princess Eugenie and Jack on their wedding day.
"Her Royal Highness has been very involved from the start and has been instrumental in the autumnal theme.
"The whole floral design team and I wish Princess Eugenie and Jack our heartfelt congratulations and we hope they have a magical wedding day."
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