To propagate your caladium:
Divide the tubers in the fall in colder climates where the caladium isn't hardy.
After the foliage has turned yellow and dried when the weather temperatures cool, dig the tubers carefully (avoid puncturing a tuber). Gently brush off the soil but never wash them with water as this can cause fungus issues later in storage. Divide them and lay them out in a single layer to air dry for several days and knock off any remaining soil afterward. Remove all the dead leaves at this point.
Sprinkle the tubers with a fungicide such as sulfur plant fungicide dust to prevent disease and rot.
Store them in a dry mixture of peat moss, coco coir, and perlite or completely dry pet bedding. Put this mixture in a dry paper box and layer the bulbs loosely apart.
Place the box on a shelf in a dark location of your home. Leave it where humidity is low, and the temperature is around 60°F.
Take a look at them monthly to ensure that they are not moist and moldy. If you detect either, throw the bulb out before it infects the others.
After dormancy, select the most healthy-looking tubers to replant. To boost more foliage, look for the large central bud on each tuber. Use a sterilized knife and carefully remove this and lift it out of the tuber. This removal will promote more foliage to grow from the smaller buds.
Follow the directions on planting and water in well! Enjoy your new crop of Caladiums or share with your besties!
If you're in a hardy USDA growing zone of 9 or above, you can leave the bulbs in the ground over the winter. In the spring (May in most locations after the last frost), carefully dig them up, divide the tubers and replant in several areas in the landscape or decorative patio containers.