This is just a theory from a desert rat far away from you, but I believe Florida's sandy, lower pH soils allow salts to wash away quickly and allow a higher tolerance to a high concentration for a short time.
I say that as salt retention (in our case mineral salts from our high pH soil, fertilization, and tap water) is a big problem with tropical and citrus plants here due to aforementioned tap water constantly putting it at risk of accumulation without soil washes and thorough draining watering, and poor draining clay soil that retains almost everything for extended periods of time.