Calla lilies are grown for their elegant blooms and deep green foliage. When they die off after the frost, the rhizomes are often dug up and stored until the next spring for replanting.
Plant calla lily rhizomes 1 to 2 inches deep, whether you are planting them in the garden outdoors or starting them inside in a pot. Plant calla lily transplants at the same level they were planted in the pot.
Plant calla lilies outdoors after danger of frost has passed in the spring or plant them in the fall before the ground freezes. Start them indoors six to eight weeks before you expect the last frost to occur in your area.
Plant calla lilies in areas of full sun for optimal growth, although they will bloom as long as they get approximately five to six hours of sun. Space them 18 inches apart.