How often should I water my Phalaenopsis orchid?

Water when the potting medium is dry and the roots look silvery, typically every 7 to 14 days, depending on conditions.

What kind of light do they need?

Bright, indirect light is best; avoid direct sunlight which can scorch the leaves.

Can I grow them in regular potting soil?

No, they need a special orchid potting mix that allows for good air circulation around the roots.

Why are my orchid's leaves turning yellow?

Yellowing leaves can be caused by overwatering, underwatering, or insufficient light.

How do I encourage reblooming?

After the flowers fade, you can try cutting the spike back to a node below the last bloom, or cut it entirely if it has turned brown.

Plant guide

Moth Orchid.

Phalaenopsis Blume

Pronounced fal-en-OP-sis

Phalaenopsis orchids, commonly known as Moth Orchids, are popular for their long-lasting, elegant blooms that resemble moths in flight. They are epiphytic, meaning they grow on other plants in their natural habitat, and are relatively easy to care for indoors.

At a glance

Care level: Easy
Plant type: Flowering perennial
Light: Bright, indirect light
Indoor light: bright-indirect
Water: Every 7 to 14 days
Mature size: 1-2 feet tall and wide
Growth rate: medium
Hardiness: USDA 10 to 12
Bloom time: Winter to spring, can rebloom throughout the year

Care

Provide bright, indirect light and good air circulation. Water when the potting medium is dry, typically by soaking the pot. Avoid letting water sit in the crown of the plant, as this can lead to rot.

Watering: Water thoroughly when the potting medium is dry to the touch. Allow to drain completely.
Feeding: Use a balanced orchid fertilizer diluted to half strength every other watering during active growth.
Pruning: Remove spent flower spikes by cutting back to a node or the base. Trim any yellow or dead leaves.
Repotting: Repot every 1-2 years after flowering, or when the potting medium breaks down.
Soil: Orchid bark mix
Soil pH: 5.5 to 6.5
Temperature: 18 to 29°C
Humidity: 40 to 70%
Drought tolerance: low
Lifespan: Perennial, can live for many years with proper care.
Deer and rabbits: high

Signs it needs repotting

Potting medium has broken down and is no longer airy.
Roots are growing out of the pot and circling excessively.
Plant appears unstable or wobbly in its pot.
Roots are consistently staying wet for too long after watering.

Safety

People: Phalaenopsis orchids are not known to be toxic to humans.
Children: While not toxic, the orchid's leaves and roots are not meant for ingestion, and small children should be supervised around the plant.
Contact allergens: The sap may cause mild skin irritation in sensitive individuals.
Airborne allergens: Pollen from Phalaenopsis orchids can be a respiratory irritant for some people.
Edibility: This plant is not intended for consumption.

How to identify it

Thick, leathery, strap-like leaves
Short, arching flower spikes
Flat, rounded, moth-like flowers
Aerial roots visible
Blooms in various colors and patterns

Height: 0.3 to 0.6m
Spread: 0.3 to 0.6m
Leaves: Green, evergreen
Flowers: White, Pink, Purple, Yellow, Red, Green, Bi-color, 5 to 10cm

Common problems

Root Rot — Overwatering and poor drainage can lead to fungal root rot, causing yellowing leaves and mushy roots.
Pests — Mealybugs and scale insects can infest the leaves and stems, weakening the plant.
Leaf Spot — Fungal or bacterial infections can cause dark or water-soaked spots on the leaves.

Growing it

Propagation: Division, Keiki
When to plant: Spring, Summer
Overwintering: Indoors, maintain consistent temperatures and reduce watering slightly during cooler months. Ensure good air circulation to prevent fungal issues.
In containers: Excellent for containers, typically grown in orchid pots with ample drainage holes to prevent waterlogging.

Keiki Propagation

Look for a 'keiki' (a baby plant) forming on the flower spike or at the base of the mother plant.
Ensure the keiki has developed its own roots and a few leaves.
Carefully cut the keiki from the mother plant, leaving a small piece of the mother plant's stem attached if possible.
Pot the keiki in a small orchid pot with appropriate orchid mix.
Keep the potting medium slightly moist and provide high humidity until the keiki is established.

When pairing plants, ensure they have similar light, humidity, and watering needs to create a harmonious environment.

Grows well with

Bromeliads — Bromeliads, like orchids, are epiphytes that thrive in similar conditions of bright, indirect light and good air circulation.
Ferns — Many epiphytic ferns share the need for high humidity and indirect light, making them suitable companions in a terrarium or greenhouse setting.
Tillandsia — These air plants also prefer bright, indirect light and good air movement, and can be mounted alongside orchids.

Keep away from

Cacti — Cacti generally require much more direct sunlight and drier conditions than Phalaenopsis orchids can tolerate.
Succulents (most) — Most succulents prefer intense light and infrequent watering, which can lead to root rot in orchids.

Similar species

Dendrobium Orchids — Dendrobiums are also epiphytic orchids that often have similar care requirements regarding light and watering, though some species have different needs.
Cattleya Orchids — Cattleya orchids are another popular group of epiphytic orchids that appreciate bright light and good air circulation, though they may need slightly warmer temperatures.

Science

Native range: Southeast Asia, Australia, and the Philippines.
Conservation: Phalaenopsis orchids are not currently listed as endangered or threatened, but wild collection should be avoided.

In their natural environment, Phalaenopsis orchids grow as epiphytes on tree branches, absorbing moisture and nutrients from the air and rain.

Uses: Ornamental

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Temperature: 7/9
Moisture: 5/9
Nutrients: 3/9
Light: 7/9

Questions people ask

How often should I water my Phalaenopsis orchid?: Water when the potting medium is dry and the roots look silvery, typically every 7 to 14 days, depending on conditions.
What kind of light do they need?: Bright, indirect light is best; avoid direct sunlight which can scorch the leaves.
Can I grow them in regular potting soil?: No, they need a special orchid potting mix that allows for good air circulation around the roots.
Why are my orchid's leaves turning yellow?: Yellowing leaves can be caused by overwatering, underwatering, or insufficient light.
How do I encourage reblooming?: After the flowers fade, you can try cutting the spike back to a node below the last bloom, or cut it entirely if it has turned brown.

Where the name comes from

Phalaenopsis comes from the Greek words 'phalaina' (moth) and 'opsis' (like), referring to the resemblance of the flowers to moths. The common name 'moth orchid' shares this origin.

Good to know

Phalaenopsis orchids can live for many years, sometimes decades, with proper care.
They are epiphytes, meaning they naturally grow on other plants in their native habitat, not in soil.
Their roots are green and photosynthetic, helping them produce energy from light.
Phalaenopsis orchids can rebloom from the same flower spike if it's not completely cut back.

Is your moth orchid looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.