I think everybody knows that you can't just stick fresh flowers into the cake, because the chemicals on the flowers or the flowers itself might have something to hurt people. So I find a really easy way to fix this problem, all you need is a food safe gloves and floral tape.

First, Cut the fingers off the gloves as many as you need.

Second, Stick the flower stem into the finger.

Third, Use the tape to wrap the glove finger with the stem tightly. 

Here is a video to show you how to do it, also show you an easy way to decorate the cake and looks pretty.