Tropical perennials native to South and Central America, Caladiums thrive in heat. Their leaves, which might resemble an arrow, a heart, an elephant's ear, or anything in between, are what make them so famous. The main reason caladiums are planted is for its foliage, which is a burst of red, purple, pink, and white hues with veining and flecking. Caladiums grow best in moist soil and make wonderful summer accents and conversation starters both inside and outside.