Caladiums that are grown in too much sun will be stressed and show signs of this fairly quickly as tips of leaves dry out and areas of the leaves begin to look burned. If nothing is done, this will continue until the entire leaf has dried out and died. Extra watering can help to an extent, especially with new plantings that may be a bit stressed out, but it won’t be a permanent solution to too much sun exposure. Monitor the plant for a couple of days then replant in a shadier area of the burning and wilting continue.