The calla lily is known to the scientific community as Zantedeschia. Calla lilies are recognizable because of their trumpet-shaped flowers. They also contain a spathe that is around four to six inches in length. These perennial plants have rhizomes that must be dug up to protect the calla lily plant during the winter months.
Mulch over the soil where you planted your calla lilies if you live in a warmer climate (zone 8 or above). The mulch will be able to keep the ground and roots warm enough for the plant to survive the winter.
Put on your garden gloves and dig out the rhizomes if you live in a colder climate (zones 7 or lower). Do this only after the first frost has occurred.
Shake or dust off any dirt that is on the rhizomes.
Place peatmoss in the bottom of a paper bag, and set your rhizome in it. Place one or two rhizomes in each paper bag. Make sure you leave the bag open so that air can get inside. Air prevents rot.
Store your rhizomes in a cool, dry location. A basement that keeps a temperature of 40 to 50 degrees Farenheit is ideal. Replant in the spring.