Calla lilies produce lush, tropical foliage that grows in clumps 2 to 5 feet tall. The flowers consist of a bright yellow spathe surrounded by a single spadix that may be yellow, pink, purple, white or red in color.
Calla lilies need full sun and a fertile soil that is rich in organic material. Gardeners should incorporate compost into the planting bed before planting. In very hot climates, calla lilies require light or dappled shade in the afternoon. When grown in a sufficiently rich soil, they don’t need fertilization.
Calla lilies need plenty of water. They make excellent plants for the shallow water around the edges of ponds and garden pools. Callas are good choices for wet, boggy soils where other plants suffer.
Calla lilies are hardy in U.S. Department of Agriculture plant hardiness zones 8 and warmer. Gardeners grow them as annuals in cooler climates, or dig up the roots in fall for winter storage indoors.