Observe the sunlight in the flower bed to determine if it receives mostly sun or mostly shade. If the bed receives mostly sun, opt for caladium varieties such as Candidum Junior, Aaron, Carolyn Whorton, Florida Fantasy, Florida Elise, Pink Cloud or Red Flash. If the bed receives mostly shade, use caladium varieties such as Red Flash, Postman Joyner, Fannie Munson, White Queen or Florida Calypso.
Look at the flowers that are already present in the flower bed and measure their height. If the flowers are not yet fully mature, read the plant tag that came with them to determine the mature height. If the height is greater than 10 inches, place the caladiums in front of the flowers. If the flower height is less than 10 inches, place the caladiums behind them.
Examine the caladium plants, or tuber bags, to determine the colors of the leaves. Group like colors of caladiums together in groups of two or three.
Place the caladium plants or tubers on top of the soil in the flower bed and use a tape measure to space them at least 7 to 8 inches apart for standard size caladiums. If you have a jumbo variety, increase the spacing to between 14 and 18 inches.
Dig a hole directly under each plant or tuber. For mature caladium plants, make the hole the same depth and width as the pot. For tubers, dig a hole that is approximately 2 inches deep. Fill in the holes with soil until the roots are completely covered with soil.