Calla Lily (Arum lily) care

Light

Bright but filtered. Calla Lily burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Outdoors thrives in full sun to part shade; in hot climates give afternoon shade to prevent leaf and flower scorch. Indoors, place in bright indirect light (6-8 hours); avoid harsh midday direct sun through glass, which can scorch foliage. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering calla lily: keep consistently moist during active growth; reduce sharply for winter dormancy. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. A bog and pond-margin native that loves wet feet. During the growing season never let the soil dry out, and it tolerates standing water up to several inches. After flowering, taper off and keep the rhizome nearly dry and cool through dormancy, as soggy soil in the resting period rots the rhizome.

Soil and pot

Calla Lily grows best in rich, humus-heavy, moisture-retentive mix. Use a fertile, organically rich, moisture-retentive medium such as peat-free John Innes No.2 with added compost. Ideal pH is mildly acidic, roughly 5.5-6.5. Unlike most container plants it tolerates poorly drained, boggy conditions during growth. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Calla Lily sits happiest at around Average to high (40-60%+) humidity and 15-27C (60-80F). Tolerates average household humidity but, as a wetland species, appreciates moderate to high moisture in the air. During winter dormancy a drier, cooler resting spot is actually preferred to prevent rot. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed calla lily sparingly. Feed monthly with a balanced liquid fertiliser (e.g. 10-10-10) diluted through spring and summer while in active growth. A higher-potassium feed encourages flowering. Stop feeding once the last bloom fades to let the plant enter dormancy, and resume only when new leaves emerge at the soil line. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on calla lily in the Growli community. Each is annotated with the most common cause so you know where to start.

• Rhizome rot — The most common killer. Caused by waterlogged soil during dormancy or poor drainage in winter. Keep the rhizome cool and nearly dry while resting, and avoid leaving it in cold, sodden soil.
• Failure to bloom — Usually from too little light, missing the winter dormancy/rest period, or over-feeding with high-nitrogen fertiliser. Provide bright light, a cool dormant rest, and a potassium-rich feed in season.
• Leaf and flower scorch — Harsh direct sun, especially in hot climates or through glass, browns leaf edges and bleaches spathes. Move to part shade or bright indirect light.
• Japanese beetles — Chew holes in leaves and flowers outdoors. Hand-pick in the early morning; avoid pheromone traps, which can attract more beetles than they catch.
• Thrips — Banded greenhouse thrips and other thrips cause silvery stippling and distorted growth. Rinse foliage, improve airflow, and treat with insecticidal soap if persistent.
• Yellowing leaves at season's end — Often normal dormancy onset as the plant dies back, not a problem. If yellowing happens mid-season it points to overwatering during a cold spell or nutrient deficiency.

Propagation

Propagate by division of the rhizome in early spring or late summer/autumn: lift a mature clump, separate offsets each with a growth point, and replant. It can also be grown from fresh seed, though seedlings are slow and variable and take a few years to flower. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Calla Lily is toxic to pets. The ASPCA lists Zantedeschia aethiopica as toxic to both dogs and cats. Although called a "lily," it is actually an aroid (family Araceae) whose tissues contain insoluble calcium oxalate crystals; chewing causes oral irritation, intense burning of the mouth, tongue and lips, drooling, vomiting and difficulty swallowing. It is unrelated to true lilies but should still be kept away from pets. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Calla Lily deep-dive guides

Every aspect of calla lily care, each with its own calibrated guide:

• Calla Lily watering schedule
• Calla Lily light requirements
• Best soil mix for calla lily
• Calla Lily fertilizing guide
• When to repot calla lily
• How to propagate calla lily
• Calla Lily growth rate & size
• Calla Lily cold hardiness
• Calla Lily temperature & humidity
• Is calla lily toxic to cats & dogs?
• Getting calla lily to bloom

Related guides

Calla Lily is also known as Calla lily, Arum lily, White arum lily, Lily of the Nile, Pig lily, Florist's calla, and Trumpet lily.

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• All 609 plant care guides in the Growli library