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Annuals for the winter season in Florida may be planted during the cooler temperatures and removed in May-June. They include the following:
Ageratum,                                           Geranium,
Alyssum,                                             Impatiens,
Asters,                                                Nasturtium,
Begonias,                                            Pansy,
Calendula,                                           Petunia,
Cosmos,                                             Snapdragon
Dianthus,                                             and Verbena 

Additional Resource 

http://edis.ifas.ufl.edu/MG319