If using more than one type in a bouquet, he notes it's important to make sure the aromas of different flowers don't clash.

WSJ: Jeff Leatham on the Secrets to Picking Blooms to Make the Room

Do not use flowers on the table that don't come from your own garden.

WSJ: How to Create an Open-Air Dining Room

For now though, their focus is on more mundane, but nevertheless vital matters such as the wedding dress, the flowers, and how to deal with the great and the good who don't get invited to the wedding.

BBC: Royal wedding: What are the royal advisers for?