Tom, I am 99 percent sure that is a euphorbia, possibly "Red Martin." It is said to be hardy from zones 6 to 9. You will probably have to do some mail-order browsing to find it. Plant Delights carries a number of euphorbias including "Red Rudolph," which seems to have less uniform red coloration than yours. Here is where I found "Red Martin," but they do not do mail order:
@ Douglas and Tom, yes it looks like a Euphorbia but I am fairly certain it is a Aeonium arboreum, check out this link to a write up in Fine Gardening magazine. Hardy to Zone 9, definitely worth a try in Florida
I think you are on the money, Erica. But if so, Tom, I think hardiness in Lady Lake would be dicey. You would definitely have to be prepared to give it some protection on nights like we've just had.
I have one that I keep in my greenhouse. I just love the way they look. I just had to treat it for mealybugs. I bought mine from a vender @ my local farmers market.
Botanical Name: Aeonium arboreum 'Zwartkop' Very easy to grow in California, and take a frost . The Aeonium family is huge with so many different colors .
http://nativeson.com/annotated_catalog/ecata...
http://www.finegardening.com/plantguide/aeon...