Watering schedule

How often to water Nun's Orchid (Phaius tankervilleae) — the schedule

Also called Swamp Orchid, Veiled Nun Orchid.

More about nun's orchid

Watering at a glance

Base rhythm	Keep evenly moist in growth, roughly every 3-5 days
Spring / summer	Spring and summer: soak or dunk the roots/mount thoroughly about once a week, then let them dry almost completely before the next soak.
Autumn	Autumn: lengthen the gap between soaks as light and growth taper off.
Winter	Winter: soak far less often — roughly every 2-3 weeks — and always let the roots dry fully in between.
Light	Bright indirect light (just back from a sunny window)

About Nun's Orchid

Phaius tankervilleae · also called Swamp Orchid, Veiled Nun Orchid · flowering

Phaius tankervilleae is a robust terrestrial orchid from Asia and the Pacific, sending up tall spikes of large, reddish-brown flowers backed with white and a rosy, trumpet-shaped lip. Unlike epiphytic orchids it grows in rich, moisture-retentive soil, wanting bright shade, warmth, steady water and feeding in growth, and is among the easiest orchids to grow as a houseplant or shaded garden plant.

Ideal humidity: 50-70%

Watch for — 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.

The watering schedule, season by season

Nun's Orchid grows on bark, not in soil — it wants its roots soaked then fully dried and exposed to air, never kept damp like a potted plant. The base rhythm for nun's orchid is keep evenly moist in growth, roughly every 3-5 days, but the real interval moves with the season, the light and the pot — so treat the figures below as a starting point and always confirm with the plant itself.

Spring & summer (active growth): Spring and summer: soak or dunk the roots/mount thoroughly about once a week, then let them dry almost completely before the next soak.
Autumn (slowing down): Autumn: lengthen the gap between soaks as light and growth taper off.
Winter (rest / dormancy): Winter: soak far less often — roughly every 2-3 weeks — and always let the roots dry fully in between.

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.

Want this turned into a live reminder that adjusts to your home and the weather? The Growli watering calculator takes your pot size, light and season and returns a starting interval for nun's orchid in seconds.

How to tell nun's orchid needs water

A calendar is the worst way to water nun's orchid. Check the plant and the soil instead — for this species, look for these signals in order:

Roots turn silvery-grey or chalky instead of green/plump.
The mount or bark medium is bone dry and light.
Leaves or pseudobulbs look slightly wrinkled or less rigid.

The most reliable single check is the first one on that list. When two signals agree, water; when they disagree, wait a day and look again — under-watering nun's orchid for a day is almost always safer than over-watering it.

Overwatering vs underwatering nun's orchid

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For nun's orchid specifically:

Signs you are overwatering

Mushy, brown, hollow roots that have stayed wet too long.
Yellowing, soft leaves at the base.
A persistently wet, never-drying medium.

Signs you are underwatering

Leaves go limp, leathery or accordion-pleated; roots stay grey for long stretches.
Shrivelling pseudobulbs or curling leaves.

Treating nun's orchid like a normal houseplant — watering little and often into bark or moss that never dries — suffocates and rots the roots. Soak hard, then let it dry out.

Water quality notes

Rainwater or filtered water is best for nun's orchid; many epiphytes are sensitive to softened water and tap-water minerals.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For nun's orchid, the levers that matter most are:

Air movement matters as much as water — roots must dry between soaks to avoid rot.
A bark or mounted medium dries far faster than moss, so the wetter the medium, the longer you wait.
In high humidity you can soak less often; in dry heated rooms, more often but still let it dry.

Pot choice is part of this too — work out the right size with the pot size calculator, since a pot that is too big stays wet long enough to rot the roots of nun's orchid.

Nun's Orchid watering — frequently asked questions

How often should I water nun's orchid?

Water nun's orchid keep evenly moist in growth, roughly every 3-5 days. Spring and summer: soak or dunk the roots/mount thoroughly about once a week, then let them dry almost completely before the next soak. Winter: soak far less often — roughly every 2-3 weeks — and always let the roots dry fully in between.

How do I know when nun's orchid needs water?

Roots turn silvery-grey or chalky instead of green/plump. The mount or bark medium is bone dry and light. Leaves or pseudobulbs look slightly wrinkled or less rigid. The single most reliable test for nun's orchid is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered nun's orchid look like?

Mushy, brown, hollow roots that have stayed wet too long. Yellowing, soft leaves at the base. A persistently wet, never-drying medium. Treating nun's orchid like a normal houseplant — watering little and often into bark or moss that never dries — suffocates and rots the roots. Soak hard, then let it dry out.

What are the signs of an underwatered nun's orchid?

Leaves go limp, leathery or accordion-pleated; roots stay grey for long stretches. Shrivelling pseudobulbs or curling leaves.

Can I use tap water on nun's orchid?