Florida Data a useful website for those planting in Florida including Plant Encyclopedia, resources and plant data. The site also has an active forum.
University of Florida Institute of Food and Agriculture Sciences.
University of Florida Landscape Plants site.
Friendly Landscaping has several interesting features, include "Interactive Yard" where you can design your own yard.
Online guide to the plants and plant life of Florida. Includes an online store.
The Florida Native Plant Society promotes preservation, conservation and restoration of native Florida plans in communities in Florida