For some actual facts, a little googling indicates there were different areas referenced as the “breadbasket of the South,” prior of course to today’s events.
The main references were to the Shenandoah Valley of VA, with a number of references to various Georgia counties and even to Atlanta, which would seem to have been more of a “bread shipping point.”
Not one reference to Florida for the phrase in 50 Googles.
In any case, VERY little wheat would have come out of FL during the War, though it was a major source of cattle and salt. Which would seem to make it more of a “hamburger basket.”
http://www.csa-railroads.com/images/Eastern%20Railroads.pdf
Look at the rail linkage. It would be logistically impossible for FLA to be “the breadbasket of the Confederacy”. Considering the state had 140,000 citizens and 70000 slaves the notion that it fed the South is absurd nonsense.