Pink Calla Lily (Pink Arum) care

Light

In the wild pink calla lily grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Thrives in full sun to bright indirect light. Outdoors, give at least 4–6 hours of direct sun for best flowering. Indoors, a south- or west-facing window is ideal. Insufficient light results in poor or absent flowering and floppy foliage. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for frequently during active growth — keep soil consistently moist; reduce sharply after flowering for pink calla lily, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Unlike Zantedeschia aethiopica, Z. rehmannii does not require standing water but needs reliably moist soil during spring and summer growth. Water thoroughly and allow only the surface to dry slightly between waterings. After flowering and as foliage yellows, reduce watering to allow the rhizome to dry out for dormancy.

Soil and pot

Pink Calla Lily grows best in moisture-retentive, fertile loam or loam-free compost. Plant in well-enriched, moisture-retentive compost or loam mixed with organic matter. Good drainage prevents rhizome rot during dry periods. A pH of 6.0–6.5 is optimal. For containers, use a quality peat-free compost enriched with slow-release fertiliser granules. 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

Pink Calla Lily sits happiest at around 50–70% humidity and 10–25°C (50–77°F). Performs well at moderate to moderately high humidity. Average indoor humidity is usually sufficient but avoid very dry, heated rooms in winter (less relevant during dormancy). Improve humidity with a pebble tray if growing in a dry interior environment. 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 pink calla lily sparingly. Feed every 2 weeks during the growing season with a high-potassium liquid fertiliser (e.g. tomato feed) to encourage flower production. Begin feeding when growth emerges in spring and cease after the plant finishes flowering and begins to die back. Avoid excessive nitrogen which promotes foliage over flowers. 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 pink calla lily in the Growli community. Each is annotated with the most common cause so you know where to start.

• Rhizome rot — Overwatering during or especially after the growing season causes rhizome rot. Ensure excellent drainage in containers and allow the rhizome to dry off completely during winter dormancy. In cold, wet climates, lift and store rhizomes frost-free.
• Failure to flower — Insufficient sunlight, excessive nitrogen, or rhizomes planted too shallowly inhibit flowering. Plant rhizomes 5–8 cm deep, feed with high-potassium fertiliser, and ensure at least 4 hours of bright light daily.
• Botrytis (grey mould) — In cool, damp, poorly ventilated conditions, Botrytis cinerea causes grey fuzzy mould on stems and spathes. Improve airflow, avoid overhead watering, and remove affected tissue promptly. Apply a copper-based fungicide if the problem persists.

Propagation

Propagate by dividing rhizome offsets in late winter or early spring before growth begins. Each division should have at least one healthy growth bud. Plant 5–8 cm deep in fresh compost and keep at 15–18°C until new shoots appear. Can also be grown from seed but flowers take 2–3 years. 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

Pink Calla Lily is toxic to pets. Zantedeschia rehmannii, like all calla lilies, belongs to Araceae and contains calcium oxalate raphides and possibly other irritants throughout its tissues. Ingestion causes oral pain, swelling, excessive drooling, vomiting, and difficulty swallowing in cats and dogs. ASPCA lists Zantedeschia (calla lily) as toxic to cats and dogs. Note: true Lilium lilies are life-threatening to cats — while callas share the common name 'lily', they are a different family and mechanism, but still must 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.

Pink Calla Lily deep-dive guides

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

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

Featured in these plant shortlists

Pink Calla Lily qualifies for 5 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 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

Pink Calla Lily is also known as Pink Calla Lily, Pink Arum, and Rehmann's Calla.

• Cosmos care — light, water and common problems
• Salvia care — light, water and common problems
• Lupine care — light, water and common problems
• All 8452 plant care guides in the Growli library