[firewater88]

We did this show a few years back. The rose was on a pedestal under a glass dome. The trick was using long bicycle brake lines (or similar), one per pedal that you want to fall off. Attach the inner line to a rose petal and somewhere off stage, pull that line and the petal falls off. The bunch of lines going to the rose was wrapped in floral tape (green) and became the stem. It worked very well and the audience loved it.