Caladium Nutrition In order to get continual growth after sprouting, caladiums should be fertilized. In sandy regions of the country, such as much of Florida, a good slow release complete fertilizer (Osmocote, Nutricote or other slow release) seems to work best.Fertilization:Although many growers do not fertilize, we recommend: 50-100 PPM N (constant) of 6-6-6 or 20-20-20 or 300 PPM N (weekly) with fresh water in between Download Printable .pdf