Hi guys! I've been reading around about fondant decorations on buttercream iced cakes melting. I have a sheet cake to do in a few weeks, and my customer has asked me to fully ice the cake in just buttercream and have fondant flowers on top. This is the first cake I'm doing in just buttercream, I've only ever done fondant covered cakes. The party is on Sunday, but the customer is going to pick it up Saturday during the day. I'm afraid that by Sunday, the flowers will melt on the cake. The customer wants a few medium sized roses & lilies in 2 of the corners, and the border to be done in pansy type of flowers around the top.
Is it best to make the fondant flowers on a piece of spaghetti and stick that into the cake? Do I make the flowers with a 50/50 mix? How far in advance should I make the flowers to ensure they are well dried out?