D300 10 image in-camera multiple exposure. Focus on the center petunia and then zoom in (or out, doesn't make much difference) while releasing the shutter ten times. With my D70, which didn't do this in-camera, combining the 10 exposures after the fact during processing was a giant pain.
The reason that I personally prefer zooming in rather than out is that it allows me to decide right at the start where the outer extreme of the subject will be. If you zoom out you may be surprised toward the end of the zoom when something that you weren't expecting intrudes into the frame.
The next time I'll do some via multiple exposure, like this one, and some by a single long exposure while zooming to show the difference. Some prefer one over the other - subjective.