The Key West Tropical Forest & Botanical Garden is the only “frost-free” botanical garden in the continental United States. A tropical environment with ample rain allows most trees to retain their leaves in the dry season (December through late May). It is home to many endangered and threatened flora and fauna. Tropical forests of the world hold at least half of all the variety of life on Earth. Moreover, the species found with the Caribbean are among the richest in plant and animal life on the planet.