Answer: I think your plants are getting too much sun. Here's some general information on Caladiums:
Caladiums are tropical plants grown for their colorful foliage. The multi-colored leaves are combinations of green, white, pink, or red and there are even fancy-leaved varieties with heart-shaped foliage, strap-leaved varieties with narrower, elongated leaves, and dwarf varieties. Plant heights vary from 18 to 24 inches for the fancy-leaf types to 8 to 12 inches for the dwarf varieties.
Plants perform best in moist, well-drained soils in partial shade. While caladiums enjoy warm weather, they don't tolerate dry conditions. In beds and borders, water plants on a weekly basis during dry weather. Mulches are also helpful. Apply a 2-inch layer of mulch around plants to conserve moisture.
Caladiums have a moderate fertility requirement. In outdoor beds, apply a balanced, slow-release fertilizer and incorporate it into the soil before planting. Fertilize caladiums with a water-soluble fertilizer every 2 to 4 weeks.
Hope this information helps!
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