Nun's Orchid (Swamp Orchid) care

Light

In the wild nun's orchid 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. Likes bright, filtered light or light shade; an east or shaded south window indoors, or a dappled spot outdoors. Avoid hot direct sun, which scorches the broad pleated leaves, but give enough light to support its tall flower spikes. 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 keep evenly moist in growth, roughly every 3-5 days for nun's orchid, 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. As a swamp orchid it likes consistently moist (not waterlogged) soil through active growth and flowering. Water before the surface dries; reduce somewhat after flowering and in cooler months, but never let this terrestrial dry out as hard as epiphytic orchids.

Soil and pot

Nun's Orchid grows best in rich, moisture-retentive terrestrial mix. Unlike bark-grown orchids, it wants a humus-rich, free-draining potting mix, such as a terrestrial orchid blend or quality potting compost with added bark and perlite. The mix should hold moisture yet drain, supporting its fleshy underground pseudobulbs. 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

Nun's Orchid sits happiest at around 50-70% humidity and 16-29°C (61-84°F). Appreciates moderate-to-high humidity but is more tolerant of average room conditions than tropical epiphytes. A humidity tray or grouping helps in dry indoor air; good airflow keeps the large soft leaves free of fungal spotting. If you keep the room above 16 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 nun's orchid sparingly. Feed regularly during active growth and spiking with a balanced fertiliser at half strength every one to two weeks, as this vigorous terrestrial is a relatively heavy feeder. Reduce feeding after flowering and during the cooler, lower-light rest. 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 nun's orchid in the Growli community. Each is annotated with the most common cause so you know where to start.

• Black streaking on leaves (Phaius black streak / virus) — Phaius is prone to a characteristic black-streak leaf disorder and viruses. Use clean tools, isolate affected plants, and discard confirmed virused stock to protect the collection.
• Leaf scorch or yellowing — Direct sun burns the soft pleated leaves, while too little light yellows them and weakens spikes. Provide bright filtered light or light shade.
• Failure to flower — Often too little light, insufficient feeding, or an immature clump. Brighten the position, feed through growth, and let the plant build several mature pseudobulbs.
• Spider mites and scale on broad leaves — Stippling or brown bumps, especially in dry indoor air. Raise humidity, improve airflow, and treat with horticultural oil or insecticidal soap.

Propagation

Divide the clump after flowering into sections each with several pseudobulbs and roots, potting into fresh terrestrial mix. Phaius can also be propagated from old flower-spike nodes laid on damp sphagnum, which produce plantlets (keikis) that are grown on once rooted. 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

Nun's Orchid is mildly toxic to pets. Phaius is not individually listed by the ASPCA; treat with caution and verify with a vet. Orchids as a family are generally regarded as non-toxic and the ASPCA lists Phalaenopsis as non-toxic to cats and dogs, but because this genus is not specifically ASPCA-assessed, keep it out of pets' reach and contact a vet if any part is eaten. 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.

Nun's Orchid deep-dive guides

Every aspect of nun's orchid care, each with its own calibrated guide:

• Nun's Orchid watering schedule
• Nun's Orchid light requirements
• Best soil mix for nun's orchid
• Nun's Orchid fertilizing guide
• When to repot nun's orchid
• How to propagate nun's orchid
• Nun's Orchid growth rate & size
• Nun's Orchid cold hardiness
• Nun's Orchid temperature & humidity
• Is nun's orchid toxic to cats & dogs?
• Is nun's orchid toxic to cats?
• Is nun's orchid toxic to dogs?
• Getting nun's orchid to bloom

Featured in these plant shortlists

Nun's Orchid 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 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Nun's Orchid is also commonly called Swamp Orchid or Veiled Nun Orchid.

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• All 1284 plant care guides in the Growli library