Zantedeschia 'Edge of Night' (Edge of Night calla lily) care

Light

Zantedeschia 'Edge of Night' is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Full sun to bright partial shade. Strong light intensifies the dark flower colour and keeps growth compact; in very hot regions give afternoon shade to prevent leaf scorch. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water zantedeschia 'edge of night' keep evenly moist in growth, watering when the top 2-3 cm of soil dries; reduce sharply as foliage fades. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Hybrid callas like steady moisture but resent sodden, cold soil, which rots the rhizome. Water freely while in active leaf and flower, then taper off in autumn as the plant prepares for dormancy.

Soil and pot

Zantedeschia 'Edge of Night' grows best in rich, free-draining, moisture-retentive loam or quality potting mix. Use a fertile mix with added compost and grit or perlite for drainage. Plant rhizomes 5-10 cm deep, eyes upward. Slightly acidic to neutral pH suits them; avoid heavy, waterlogged ground. 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

Zantedeschia 'Edge of Night' sits happiest at around 40-60% humidity and 15-24°C (60-75°F). Tolerates average outdoor and indoor humidity. Good airflow matters more than high humidity for these hybrids, helping prevent fungal leaf and rhizome issues. 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 zantedeschia 'edge of night' sparingly. Feed every 2-3 weeks during active growth with a balanced or slightly potassium-rich liquid feed to support flowering. Avoid excess nitrogen, which favours leaves over blooms. Stop feeding as the plant enters dormancy. 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 zantedeschia 'edge of night' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Rhizome rot — Cold, wet, poorly drained soil rots the rhizome quickly. Plant in free-draining mix, avoid overwatering, and never leave tubers in waterlogged pots over winter.
• All leaves, few flowers — Too much nitrogen or too little light reduces blooming. Switch to a higher-potassium feed and give full sun to bright light.
• Leaf scorch — Margins brown in fierce afternoon heat or after letting the soil dry out. Provide afternoon shade in hot climates and keep moisture steady during growth.
• Failure to overwinter — In zones below 8 the rhizome dies if frosted. Lift after foliage dies back, dry and store frost-free, then replant in spring.

Propagation

Divide the rhizome during dormancy, ensuring each section has at least one growth eye, and replant in spring once frost risk passes. Named hybrids are propagated vegetatively, not reliably from seed. 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

Zantedeschia 'Edge of Night' is toxic to pets. The ASPCA lists calla lily (Zantedeschia) as toxic to cats and dogs. The toxic principle is insoluble calcium oxalates; chewing any part releases raphide crystals causing oral and lip burning, intense drooling, vomiting and difficulty swallowing. Note this is gastrointestinal irritation, not the kidney toxicity of true lilies. 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.

Zantedeschia 'Edge of Night' deep-dive guides

Every aspect of zantedeschia 'edge of night' care, each with its own calibrated guide:

• Zantedeschia 'Edge of Night' watering schedule
• Zantedeschia 'Edge of Night' light requirements
• Best soil mix for zantedeschia 'edge of night'
• Zantedeschia 'Edge of Night' fertilizing guide
• When to repot zantedeschia 'edge of night'
• How to propagate zantedeschia 'edge of night'
• Zantedeschia 'Edge of Night' growth rate & size
• Zantedeschia 'Edge of Night' cold hardiness
• Zantedeschia 'Edge of Night' temperature & humidity
• Is zantedeschia 'edge of night' toxic to cats & dogs?
• Is zantedeschia 'edge of night' toxic to cats?
• Is zantedeschia 'edge of night' toxic to dogs?
• Getting zantedeschia 'edge of night' to bloom

Featured in these plant shortlists

Zantedeschia 'Edge of Night' qualifies for 3 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 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Zantedeschia 'Edge of Night' is also commonly called Edge of Night calla lily or deep purple calla.

• Peace lily care — light, water and common problems
• Bird of paradise care — light, water and common problems
• Hoya care — light, water and common problems
• All 5561 plant care guides in the Growli library