Calla lily plants (Zantedeschia aethiopica) are identifiable by their unique, funnel-shaped flowers, which commonly bloom in white but come in other colors as well. When given proper care and attention, calla lilies will flourish both outdoors in gardens or indoors as potted plants.
Calla lilies being grown outdoors in Zones 8 or above must be winterized to survive. Wait until fall, after the plant has bloomed, before cutting the stem down to the closest leaf joint. After the foliage has died, the bulb may be lifted out of the ground and stored inside a box filled with peat moss for the season.
Plant calla lily bulbs 4 to 6 inches deep in the soil. If the flower is being planted in a container, use a pot at least 6 inches wide to provide adequate root room. Give calla lily plants morning sun and afternoon shade, if possible, and keep the surface soil moist at all times.
Add 20-20-20 fertilizer to calla lily soil every other week during the spring and summer growing season. Water the soil after applying fertilizer, but take care not to overwater. Do not allow standing water to accrue on the calla lily flower bed.