Show the feather stem with no flower. Tuck the stem under your arm, with the end for the flower facing the back. Turn your back to the audience, as if looking for the flower, and secretly make the flower bloom. Your audience will scream that it's bloomed, but when you take it from under your arm (and secretly make the bloom go back into the stem)- there is no flower when you hold it in front of you. It only seems to bloom when your back is turned!
As a "thank you" to a special audience member, present the green stem, then as all watch, make the stem bloom for her.
Propose with style! Attach the engagement ring to the center of the flower. As she watches, the red flower magically appears and, as it get larger and opens- there is the ring!