The Calla Lily (Zantedeschia) can thrive as an elegant houseplant, offering distinctive trumpet-shaped blooms and glossy foliage. Originating in the marshy areas of South Africa, this plant is naturally suited to warm, bright conditions that can be replicated inside a home. Success depends on providing consistent attention to its specific needs, which differ from typical foliage houseplants. The striking visual appeal of its flowers, which range from classic white to deep burgundy and vibrant yellow, makes the specialized care worthwhile.
Creating the Right Indoor Environment
Proper placement is essential for cultivating a healthy indoor Calla Lily, as it requires ample light for growth and vibrant flowering. The plant flourishes in bright, indirect light, such as near an east-facing window or a few feet away from a south or west-facing window. While strong light encourages blooming, direct, intense sunlight can quickly scorch the leaves, so protection like a sheer curtain is necessary to diffuse the rays.
The correct temperature range is also important, mimicking the warm climate of its native habitat. Calla Lilies prefer daytime temperatures between 60 to 75°F (15 to 24°C) and should not be exposed to temperatures below 55°F (13°C) at night. Placing the plant away from cold drafts or hot air blasts helps maintain this stable environment. Since these plants enjoy moisture, increasing the surrounding humidity helps prevent the leaf edges from turning brown. This can be achieved by placing the pot on a pebble tray filled with water or using a nearby humidifier.
Essential Ongoing Care
The Calla Lily requires a consistently moist environment, reflecting its natural tendency to grow in boggy areas, but the soil must never become waterlogged. Water thoroughly when the top inch of soil feels dry to the touch, ensuring the container has drainage holes to prevent root rot. The ideal planting medium is a rich, well-draining potting mix, often amended with organic matter like compost or perlite to improve aeration and prevent compaction.
During the active growing and flowering season, the plant benefits from regular nutritional support to fuel its large blooms. Apply a balanced, water-soluble liquid fertilizer every two to four weeks, typically diluted to half the recommended strength to avoid nutrient burn. Use a fertilizer lower in nitrogen, as excessive nitrogen promotes lush leaf growth at the expense of flower production. As the plant prepares for its resting phase, all fertilization should cease completely.
Handling the Dormancy Cycle
To ensure the Calla Lily reblooms year after year, it must undergo a required period of dormancy that simulates its natural rest cycle. After the flowers fade, the foliage will naturally begin to yellow and die back, signaling the plant’s need for rest. At this stage, gradually reduce watering, allow the leaves to wither completely, and then cut the spent foliage back to the soil line.
The rhizome should then be stored in a cool, dark, and dry location for approximately two to three months. A temperature range of 40 to 50°F (4 to 10°C) is suitable for this resting period, and watering should be minimal, just enough to keep the soil from completely drying out. This intentional rest period allows the plant to conserve energy and prepare for future flowering when it is brought back into warmth and light in the spring.
Safety Considerations for Homes with Pets or Children
Calla Lilies pose a toxicity risk to both pets and humans if any part of the plant is ingested. The plant contains insoluble calcium oxalate crystals, which are microscopic, needle-shaped structures found throughout the plant tissue. Chewing on the leaves, stems, or rhizomes releases these crystals, which penetrate the soft tissues of the mouth and gastrointestinal tract.
Symptoms typically manifest immediately and include intense oral irritation and burning, excessive drooling, swelling of the mouth, tongue, and lips, and vomiting. While rarely life-threatening, the discomfort is significant, and the plant should be placed well out of reach of curious small children and household animals. If ingestion is suspected, immediate consultation with a veterinarian or physician is necessary.