This is a native plant in Florida. The leaves have a rather pungent odor. I'm not sure whether it will overwinter outside this far north. Mine came from Lutz (Tampa area). Kept it in the GH last year. This year I have left some outside, so come spring we shall see.
which makes me very happy. Indeed they survive hard freezes here in the Florida panhandle and are VERY prolific self sowers. Right now October 2, 2015 my yard is dotted with patches of blue
Each cloud has a silver lineing if only you look for it.