Zantedeschia aethiopica, commonly called calla lilies, are not true lilies, but are arum (Jack-in-the-pulpit) family members. They are stemless plants whose flowers and leaves rise directly from rhizomes. They typically grow in clumps to 24-36” tall and feature large arrowhead-shaped (sagittate) leaves and extremely showy flowers consisting of a yellow finger-like spadix surrounded by a bright white spathe borne atop a leafless stalk. Commercially grown as a very popular cut flower.
Winter hardy to USDA Zone 8, and may survive some Zone 7 winters with protection. Plant rhizomes 3-4” deep and 12-18” apart in spring after threat of frost has passed. Best in moist soils with full sun to part shade. Prefers part shade in the St. Louis area.