A gardening friend has two pots of the most beautiful and colorful caladiums on her deck which gets a lot of shade and only filtered light. Can you order these bulbs from a catalog or buy locally? I really don't have many places that I think they would grow but there is one place that would get morning sun and I could plant in a patio container under the shade of a dogwood tree. Is there one company that specializes in this plant bulbs? Do you have to dig them up in the winter before frost like dahlias?