The magician displays a Bouquet of 5 white flowers. As he plucks them one by one, he is left with a bunch of stems and leaves. Suddenly the bunch begins to swell, and small, multi-colored buds inexplicitly appear on the stems. The buds continue to grow, bigger and bigger, until the magician is holding a beautiful, full multi-colored bouquet of flowers.
This is a visual and colorful effect that is self-working due to the mechanical components. This can also be done in a pot by the magician, or by an assistant without it seemingly being touched.