I am going to make flowers for a buttercream cake (crusting, American type). I am thinking of making the flowers out of fondant and gumpaste. Some will be fantasy, some will be roses... Does anyone know how long I have after placing the flowers on the cake for them to begin to wilt? I'd hate to deliver the night before only to hear that at the time of the party it's all a mess! And what if my flowers aren't completely dry in the thickest part? Thank you in advance!

Are you going to be sticking them flat on the side of the cake, like a daisy? Or laying them on the base around the cake? Or are you going to be laying them on top.

If they are made out of fondant and gumpaste, they shouldn't wilt. The flowers should hold their shape.

Are you concerned with the flowers falling off the cake? Like out of the buttercream?

I'll place some 5 petal flowers flat. I'm concerned about the roses, which I will place on the cake but they will be standing up/out from the cake. Thank you for your help!