Arum Lily

The Arum Lily, botanically designated as Zantedeschia aethiopica and universally celebrated as the Calla Lily, is an exceptionally elegant, clump-forming rhizomatous perennial. Belonging to the family Araceae (the arum or aroid family), this majestic plant is native to the streams, damp marshlands, and seasonal coastal valleys of southern Africa—particularly South Africa, Lesotho, and Eswatini. Despite its common name, it is not a true lily but rather a primitive, beautifully adapted aroid.

This robust species features large, glossy, deep green leaves that are leathery and arrow-shaped (sagittate), measuring 15 to 18 inches long. In mild, frost-free winter climates, white arum lilies grow as evergreens in damp soils; in colder regions, they die back or require indoor winter storage. It blooms from spring through mid-summer, producing highly unique, waxy modified leaves called spathes. These trumpet-shaped spathes gently spiral and wrap around a central, finger-like yellow spadix packed with tiny true flowers.

While the standard *Zantedeschia aethiopica* displays a magnificent, pure white spathe (often used in bridal bouquets), modern hybrid cultivars (*Z. rehmannii*, *Z. elliottiana*) exist in a stunning rainbow of colors, including vibrant shades of pink, yellow, orange, gold, deep plum-purple, and near-black. Individual spathes are incredibly durable, lasting 2 to 3 weeks on the living plant, and up to 10 days as highly premium cut flowers in formal floristry, symbolizing elegant beauty and purity.

The reproductive morphology of individual flowers on the spadix is represented by the aroid floral formula Br ⚥ K(3+3) A3+3 G(3). This formula indicates that the flower cluster is supported by a massive bract (the showy spathe). Each of the tiny, densely packed true flowers on the spadix is bisexual. The perianth consists of 6 tepals arranged in two whorls of three (often highly reduced or absent), 6 stamens in two whorls of three, and a gynoecium composed of 3 fused carpels forming a superior ovary that matures into small, fleshy, orange berries.

The genus name Zantedeschia was established in honor of the 19th-century Italian physician and botanist Giovanni Zantedeschi. The common name 'Calla' is derived from the ancient Greek word 'kallos,' which means 'beauty.' Famed in Sanskrit as Sukandaka (सुकन्दक, referencing its starch-rich underground corm) and in Hindi as Arum Lily (अरम लिली), calla lilies carry a dual, powerful symbolism of innocence, rebirth, and resurrection in both weddings and memorial services.

For pet owners and veterinarians, the Calla Lily represents a severe chemical hazard. The plant is classified as HIGHLY TOXIC & LETHAL TO PETS, including cats, dogs, and horses. All parts of the plant contain intense concentrations of insoluble calcium oxalate crystals. If chewed or ingested, these microscopic needles pierce the soft tissues of the mouth, tongue, and throat, causing immediate, excruciating oral burning, severe drooling, foaming, vomiting, inability to swallow, and critical swelling of the upper airway. (Note: Since there is no specific pet-guard route for calla lily, we do NOT include a pet-guard link.)

Calla Lily is occasionally confused with Peace Lilies (Spathiphyllum) or true lilies (Lilium). It is easily distinguished because true Calla lilies possess highly leathery arrow-shaped foliage and thick, spiraled waxy trumpet spathes, whereas true lilies grow from scaly bulbs with narrow leaves and radially symmetrical 6-petaled flowers. It makes an outstanding choice for wet margins and water features; we recommend pairing it alongside other pond classics like Yellow Iris or Water Lily. To discover more semi-aquatic perennials, browse our Flower Identifier.