Grow calla lilies in rich, moisture-retentive soil with good drainage, in sun or partial shade. Keep the soil consistently moist while plants are actively growing, then reduce watering when tender types go dormant. The key to successful care is knowing which Zantedeschia you have: colored callas are generally frost-sensitive, while white Zantedeschia aethiopica is hardier but still depends on local winter conditions.
What calla lilies are—and why the type matters
“Calla lily” usually refers to Zantedeschia, a rhizomatous plant in the arum family, not a true lily. What looks like a flower is a hood-shaped spathe surrounding a central spadix. The genus includes white-flowered Z. aethiopica and colored forms with different hardiness and moisture needs. Since care recommendations vary by species, cultivar and climate, check the plant label or supplier’s instructions rather than relying on one universal rule. See North Carolina State University Extension’s Zantedeschia overview.
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How to plant calla lilies
Choose a site and soil
Choose a warm, sheltered spot with sun or partial shade. Good light generally supports flowering; in hotter climates, partial shade can help. Use fertile, organic-rich soil. Most callas need soil that retains moisture but drains well. White Z. aethiopica tolerates wetter conditions and may grow at a shallow pond margin; that does not make waterlogged soil suitable for every calla. The North Carolina State University Extension profile for Z. aethiopica describes this hardier species.
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Plant dormant rhizomes in spring
Plant outdoors after frost danger has passed. Set the rhizome with its buds facing upward, and use the depth recommended for the identified cultivar. Guidance differs: the Royal Horticultural Society (RHS) recommends placing dormant rhizomes near the surface with the top just showing; Iowa State University recommends about 1–2 inches deep when starting them indoors, and North Carolina State Extension gives about 2 inches as general guidance for the genus. These are not interchangeable rules for every type or setup. If the plant label gives a depth, follow it.
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Start rhizomes indoors for an earlier start
In colder areas, or to get plants growing sooner, Iowa State University Extension recommends starting rhizomes indoors about 6–8 weeks before the area’s average last spring frost. Plant them about 1–2 inches deep in a well-drained potting mix. Water once, then keep the mix moist but not wet and provide warmth. When leaves appear, move the pot to a sunny window or under fluorescent lights. Gradually acclimate foliage-bearing plants to outdoor conditions, and set them outside only after frost danger has passed. See Iowa State’s tender-perennial planting guide.
How often to water and when to feed
Water newly planted callas regularly until established. During active growth, keep the soil consistently moist, especially in dry weather and in pots, which can dry out faster than garden beds. Moist is not the same as waterlogged: most callas need drainage, and tender rhizomes are vulnerable to rot if kept too wet while dormant. Reduce watering during winter dormancy.
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Feeding is not essential in every garden. The RHS says hardy arum lilies in fertile, organic soil may not need extra fertilizer. On poorer soil, or when encouraging growth, it suggests a balanced liquid feed every two weeks through flowering. Tender callas can also be fed while actively growing, particularly in containers. See the RHS Zantedeschia growing guide.
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Callas can grow in outdoor containers or as houseplants. For a pot, use a fertile, free-draining mix; the RHS recommends loam-based container compost. Give indoor plants bright light, with a sunny window or grow light as options, and keep the mix consistently moist during active growth without leaving it sodden. Iowa State notes that a calla kept too wet indoors can rot, so monitor the mix rather than watering to a rigid schedule.
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Tender callas may become dormant indoors in winter. During dormancy, give little or no water rather than maintaining the moisture level used during active growth. Iowa State’s guide to bulbs suited to houseplants notes that the balance of light and water can make callas more demanding as blooming houseplants than as foliage plants.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can calla lilies survive winter?
Winter care depends on species, cultivar and climate. Tender colored callas cannot tolerate frost and need frost-free storage or protection in cold regions. For tender types, the RHS advises: “Temperatures below 5˚C (41˚F) can kill tender calla lilies, so bring them indoors before the first frost.” In climates with cold winters, North Carolina State and Minnesota Extension guidance recommends preparing to lift and store tender rhizomes.
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- Planting Method: Prior to sowing, it is recommended to soak the seeds in lukewarm water for approximately 24 hours. Plant in well-draining soil at a depth about 1-2 times the seed's diameter. Keep the soil consistently moist until germination occurs.
- Planting Method: Sow seeds outdoors after the last threat of spring frost has passed. During germination, provide bright, indirect light and maintain consistent moisture in the soil, avoiding both waterlogging and complete drying out.
- Use: The blooms are well-suited for fresh-cut indoor floral arrangements. Their sturdy stems and long vase life add an elegant touch to home decor.
- Use: When planted in groups, Calla Lilies serve as excellent decorative plants for flower borders, garden edges, or beside water features, offering striking linear form and color contrast.
Zantedeschia aethiopica is hardier and may remain outdoors in milder locations, but severe winter conditions can still injure it. Do not assume a calla is hardy just because another species or cultivar overwinters locally; use the plant label and local conditions to choose a plan.
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- For tender types in cold climates: Treat them as seasonal outdoor plants, or lift the rhizomes and store them in a protected, frost-free place.
- For hardier Z. aethiopica: It may overwinter outdoors in a suitable mild location, but provide protection where winter conditions could cause injury.
- For dormant tender callas in pots: Reduce watering; do not keep the mix wet through dormancy.
Propagating callas by division
Zantedeschia aethiopica can be propagated by dividing its storage organs. North Carolina State Extension recommends division in early spring after frost danger or in late summer or early fall after flowering. Handle the pieces carefully, allow cut surfaces to dry and callus, then replant.
Quick Recap
Common problems and safety
- Rhizome rot: A tender rhizome kept too wet during dormancy may rot. Reduce watering when growth stops and avoid waterlogged conditions for types that require drainage.
- Frost injury: Frost can kill tender callas. Move or lift them before cold weather reaches the threshold specified for tender types in the RHS guidance.
- Indoor pests: The RHS lists aphids, red spider mites and whitefly among pests that can affect indoor callas.
- Poisoning risk: Callas have poisonous characteristics if ingested. Keep every plant part away from children and pets, and wash hands if sap contacts skin. North Carolina State Extension provides safety information in its genus profile.
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