The question implies a relationship that doesn't exist. Deserts do not give anything to Florida—geographically, climatically, or ecologically. The distance and intervening systems make any direct influence impossible.
Florida occupies the southeastern U.S. peninsula between the Atlantic Ocean and Gulf of Mexico. The nearest true deserts—the Chihuahuan, Sonoran, and Mojave—lie 1,500+ miles west across the entire North American continent. No atmospheric or hydrologic pathway connects them meaningfully.
Florida's climate is humid subtropical to tropical: abundant rainfall (50-65 inches annually), high humidity, frequent thunderstorms, and lush vegetation. Deserts are defined by aridity (<10 inches rain), low humidity, and sparse vegetation. They are climatic opposites.
Any desert-Florida links operate through planetary-scale systems:
Florida's water, nutrients, and ecological inputs come from: the Floridan Aquifer, Gulf Stream, Atlantic moisture, Gulf of Mexico, rainfall, and the Everglades watershed—none desert-derived.
The answer remains simple: nothing. Deserts and Florida operate in separate planetary systems.