Jene's Tropicals in St. Pete has cinnamon trees or they did the last time I was there. Not at all cold hardy from what I've read. There are two kinds of culinary cinammon sold in the United States, the most common is cassia, then there is true cinammon which has a hotter, sharper flavor. Take a look at Penzey's Spice House (www.penzeys.com) and they'll explain the difference. I'm not sure which one Jene's sells, but both are good.
.....Alan.