Hi everyone
I thought I'd mention something EXTREMELY IMPORTANT regarding fresh flowers and wedding cake.
Fresh flowers contain toxins and bacteria (Ivy and delphiniums to name a few) and when inserted directly in a wedding cake those toxins or bacteria can can get into your cake and can make your guests sick.
From what I read and learnt as a florist, there aren't any safe non-toxic flowers unless they have been grown organically with no pesticides or toxins.
Please take precaution and DO NOT ask your baker or your florist to insert fresh flowers directly into your wedding cake, unless they are in a container or the stems are wrapped tightly and nothing seeps out.
Just to be absolutely safe, a good alternative would be to use sugar flowers (you can ask your baker to make them for you) or you can use fake flowers (which you should clean before inserting in the cake).
Also, you can ask your florist to make you an arrangement in a container, to be inserted in between the layers of the cake (again, this may not work for all cakes - it all depends on design)
Here's a link to an article with useful information
List of Non-Toxic Flowers for Garnishing your Cake on CakeCentral.com
Laura