I suspect the spelling should be calamintha. I couldn't find a carolinensis (which indicates it's from one of the Carolinas) but did find c. georgiana.

Here's one site that relates it to Florida:

http://hawthornhillwildflowers.blogspot.com/2009/10/georgia-calamint-calamintha-georgiana.html

This plant caught my eye at a local nursery too. - June

Oh yes, I have 1 (GA calamint) I got @ the Greenthumb Festival & planted last spring & it's doing well in the ground. It got a bit straggly & I think I need to prune, but it grew rapidly & bloomed profusely for me here in coastal Pinellas.

Gotta love the folks who mis-tag plants!

June, thanks for the link to Craig Huegel of Pinellas County's description; it is more encouraging than a c.georgiana reference I had read that put that into "zones 7-8". Craig's photo is so enlarged compared to my viewing of the plant... I didn't notice speckles on the tiny, tiny flowers. I will pass it on to the new plant owner... especially, to expect it to lose leaves in "winter" and the stems to become brittle.