Caladiums (Caladium hortulanum) are members of the Araceae family and they originated in the Amazon basin in Brazil.. It is therefore very important to keep them warm. When your bulbs arrive it is important that you unpack them immediately, as they are live plants. Store in a warm room with good air circulation until ready to plant--(70 to 80 degrees F) for long-term storage, 70 degrees is optimal.
Many people think the larger the tuber the larger or better the plant. In general, a larger bulb will produce more and larger leaves quicker than a smaller bulb. But over the season smaller bulbs, with proper care, will produce the desired effect. They should be planted so that about an inch and a half of soil covers the tuber. The spacing of the tubers depends upon the size of the tuber planted and how full you want the effect to be. Generally speaking, for a full appearance, plant two #1 bulbs 2 to 4 inches apart, then space these plantings 12 to 18 inches apart.
Again, it is very important not to plant the bulbs too early. Later is better than to early. Wait until all chance of frost is past. Caladiums may also be grown in pots, indoors or out. They can be started earlier in pots in a warm part of your home and then moved outside when you desire. Also, the leaves are beautiful and very long-lasting in floral arrangements!