I am doing a small 2 tier cake wedding cake. This will be my first wedding cake, and also first cake with flowers. The bride wants a small circle "bouquet" of real roses on the top tier. Should I have her buy them from the florist she is using, then put them on at the event, or should I buy them myself and add them to the cost of the cake? Not sure which to do. Also, can I just put them on a small cake board lying on top of the tier, or is there a better method? Thanks to anyone with experience with this!!

I require brides to provide all florals, silk or real. I tell them to just leave them on the cake table and I'll apply them when I set up the cake. She can tell the florist she needs an arrangement for the top of the cake and he/she can do whatever need done.