Black Calla Lily (Black Star Calla) care

Light

Bright but filtered. Black Calla Lily burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Performs best in full sun to bright indirect light — at least 6 hours of sunlight daily outdoors. Indoors, position at a bright south- or west-facing window. Insufficient light causes pale, etiolated stems and dramatically reduces flower production and colour depth. 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 black calla lily: generously during active growth; taper off as foliage dies back; bone dry in 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. Keep soil consistently moist but not waterlogged throughout spring and summer. Use well-draining containers to prevent waterlogging. After the plant completes its summer performance and foliage yellows, gradually reduce watering until the rhizome is completely dry for winter storage.

Soil and pot

Black Calla Lily grows best in rich, well-draining potting compost enriched with organic matter. Use a quality peat-free compost mixed with 20–25% perlite for drainage. Enrich with slow-release granular fertiliser at planting. A slightly acidic pH of 6.0–6.5 suits this hybrid. In borders, improve drainage with grit if soil is heavy. 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

Black Calla Lily sits happiest at around 50–65% humidity and 10–25°C (50–77°F). Performs well at average to moderate humidity. Avoid excessively dry indoor environments during active growth. Humidity is less critical than soil moisture and light for this hybrid. Normal household conditions of 40–60% are acceptable provided the plant is well-watered. If you keep the room above 10–25°C 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 black calla lily sparingly. Apply a high-potassium liquid fertiliser (tomato feed formula) every 2 weeks from when shoots emerge until the flower spathes begin to fade. This promotes the deep pigmentation and strong stem development the cultivar is selected for. Switch to a balanced feed at planting if soil has not been pre-enriched. 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 black calla lily in the Growli community. Each is annotated with the most common cause so you know where to start.

• Fading spathe colour — The deep black-maroon pigmentation fades in insufficient light or heat. Ensure at least 6 hours of bright light and do not position in cool, shaded spots. High-potassium feeding also helps sustain colour intensity.
• Rhizome rot in storage — If rhizomes are stored damp or cold (below 5°C/41°F), they rot over winter. After drying off, store in paper bags filled with dry vermiculite or coir at 10–15°C. Check monthly and discard any soft, discoloured rhizomes.
• Aphids on new growth — Aphids cluster on emerging shoots and flower buds in spring. Blast off with a strong jet of water, or apply insecticidal soap. Ants tending aphid colonies on outdoor plants indicate an infestation — use a sticky barrier on pot legs.

Propagation

Propagate by dividing rhizome offsets when lifting rhizomes in autumn or at replanting in early spring. Each offset should have a visible growth point. Allow cut surfaces to dry for 24 hours, dust with sulphur powder to prevent rot, and plant 7–10 cm deep in fresh compost. 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

Black Calla Lily is toxic to pets. All Zantedeschia hybrids, including 'Black Star', belong to Araceae and contain insoluble calcium oxalate raphide crystals throughout all plant parts. Ingestion by cats, dogs, or humans causes immediate oral irritation, intense burning sensation, drooling, vomiting, and swelling. ASPCA lists Zantedeschia (calla lily) as toxic to cats and dogs. Keep away from pets and children. 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.

Black Calla Lily deep-dive guides

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

• Common black calla lily problems & fixes
• Black Calla Lily watering schedule
• Black Calla Lily light requirements
• Best soil mix for black calla lily
• Black Calla Lily fertilizing guide
• When to repot black calla lily
• How to propagate black calla lily
• How to prune black calla lily
• What's eating my black calla lily?
• Black Calla Lily growth rate & size
• Black Calla Lily cold hardiness
• Black Calla Lily temperature & humidity
• Is black calla lily toxic to cats & dogs?
• Is black calla lily toxic to cats?
• Is black calla lily toxic to dogs?
• All 18 Zantedeschia varieties
• Getting black calla lily to bloom

Featured in these plant shortlists

Black Calla Lily qualifies for 6 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Black Calla Lily is also commonly called Black Calla Lily or Black Star Calla.

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