http://solutionsforyourlife.ufl.edu University of Florida, Institute of Food and Agricultral Sciences, with links for lawn and garden information, sustainable living, etc.
http://www.floridayards.org/fyplants/index.php Florida-friendly plant database with all kinds of trees, shrubs, groundcovers, etc. for each area of Florida.
http://www.floridayards.org Florida-friendly landscaping guide.