In frost-free areas, grow Calla Lilies
a moist, sunny to semi-shady location with soil that has been amended with
a lot of organic matter. Plant the rhizomes 8 cm deep and 30-38 cm apart.
Water liberally and feed monthly during the growing season. After the
flowers fade, reduce the amount of water. In areas where Callas are not
hardy, allow the plants to dry out. Dig the rhizomes and store in dry
material for the winter. Hardy in zones 9-11.