Will you elaborate on your request? Have you seen such a plant and now want to know what it is, or is it something you've only heard about? Because we could use more details to ID this. I would suggest you look at Perilla or Shiso. It will reseed in your area, but could overwinter in Florida.
Plant brought from Florida garden two years ago. Eight plants started from top cuttings and grown indoors. Plant has one main upright stem,opposite leaves 5 to 6 inches long strongly ribbed with strong veins, edge of leaf finely notched. Purplish red which fades if exposed to too strong sun.
If you think it's a Cordyline terminalis you may find it on this site: http://www.cordyline.org/index.php?option=com_zoom&Itemid=35&catid=13
Thanks very much. The world of cordylines turns out to be overwhelming, but I think we have indeed entered it.