Ask Mr. Smarty Plants

Bauhinia variegata, Purple Orchid Tree is native to temperate and tropical Asia and therefore out of the range of expertise of the Lady Bird Johnson Wildflower Center. We recommend the use of plants native not only to North America but to the area in which they are being planted. Native plants will need less water, fertilizer and maintenance to thrive.

Since we obviously will have no information on this plant in our Native Plant Database, let us refer you to this Floridata site Bauhinia variegata.  In part, it says that this plant is hardy in USDA Hardiness Zones 9 to 11, and can withstand temperatures down to 22 deg. The site also says that after a freeze, the leaves may fall off the Bauhinia, but it will probably recover. You can always cover the tree if a more severe freeze is predicted in your part of Florida. The USDA Plant Hardiness Zone map indicates that Volusia County, Florida, on the eastern Gulf coast, is in Zones 9a (average annual minimum temperature 20 to 25 deg.F) to 9b (25 to 35 deg. F). 

Please note that Bauhinia variegata is listed as a Category 1 invasive species on the Florida Exotic Pest Plant Council's 2005 list of Invasive Species.