No you can't just stick them in as they could be dirty and the plastic they are made from is likely not food safe. You could insert the ends into straws or get some posy picks.
I never have done this but what I imagine is to wrap the stems from the silk flowers with floral tape and stick to cake, the tape protects the cake from the plastic, you can't glue flowers to buttercream with royal icing, the grease from the buttercream might have a melting reaction with buttercream hopefully someone posts a better answer
For 100 servings I'd do a 6-9-12... it will look more proportional. ![]()
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