How often should I water my orchid?

Water when the roots turn silvery gray, usually once a week.

Why are my leaves turning yellow?

This is often a sign of too much direct sunlight or overwatering.

Plant guide

Moth Orchid.

Phalaenopsis

Pronounced fal-uh-NOP-sis

Also known as Moth orchids, Phals, moth orchid

Phalaenopsis amabilis — Photo by Julien Lepage (CC BY) via iNaturalist

Moth orchids are beloved for their long lasting, elegant blooms that resemble fluttering wings. They thrive in warm indoor environments and are perfect for beginners looking to enjoy exotic flowers. With the right care, these beauties will reward you with stunning displays year after year.

At a glance

Care level: Moderate
Plant type: Epiphytic orchid
Light: Bright, filtered light away from harsh afternoon sun.
Indoor light: Bright indirect
Water: Every 7 to 10 days
Mature size: 2 to 3 feet tall
Growth rate: Slow
Hardiness: USDA 10 to 12
Bloom time: Late winter to spring

Care

Plant these in a specialized orchid bark mix to ensure proper airflow around the roots. Watch for wrinkled leaves, which often signal that the plant needs more water. Avoid letting water sit in the crown of the plant to prevent rot.

Watering: Water when the roots turn from green to a silvery gray color.
Feeding: Use a balanced orchid fertilizer diluted to half strength during the growing season.
Pruning: Trim the flower spike back to the base once all blooms have faded.
Repotting: Repot only when the potting medium has broken down or the plant has outgrown its container.
Soil: Orchid bark mix
Soil pH: 5.5 to 6.5
Temperature: 15 to 29°C
Humidity: 50 to 80%
Drought tolerance: Low
Lifespan: Perennial, can live for many years with proper care.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the pot.
Potting media has broken down into fine soil.
Plant is unstable in the pot.

Safety

People: These orchids are generally considered non-toxic to humans.
Pets: Phalaenopsis orchids are non-toxic to cats and dogs.
Children: Keep out of reach of small children to prevent accidental ingestion of potting media or plant parts.
Contact allergens: Some individuals may experience mild skin irritation from contact with the sap.
Airborne allergens: The pollen is generally not considered a significant airborne allergen.
Edibility: This plant is not intended for human consumption.

How to identify it

Broad, fleshy, dark green leaves
Arching stems with multiple flowers
Flowers feature a distinct labellum
Aerial roots often visible above soil

Height: 0.3 to 0.9m
Spread: 0.2 to 0.6m
Leaves: dark green, mottled, evergreen
Flowers: white, pink, purple, yellow, striped, 5 to 12cm

Problems to watch for

MealybugsCommon
Root RotCommon
Brown Leaf EdgesUncommon
Bud DropUncommon
EdemaUncommon
Scale InsectsUncommon

By symptom

Check your moth orchid from a photo

Pocket Botanist looks at a photo of your plant and tells you what's wrong and what to try first.

Growing it

Propagation: cuttings, seed
When to plant: spring, summer
Overwintering: Keep the plant in a warm spot away from cold drafts or heating vents. Reduce watering slightly during the cooler months.
In containers: They thrive in containers, specifically specialized orchid pots with drainage holes, using bark-based media.

Keiki offsets

Wait for the baby plantlet to develop its own roots.
Gently detach the keiki from the mother plant.
Pot the keiki in fresh orchid bark.

Group plants together to create a microclimate that boosts ambient humidity.

Grows well with

Ferns — They enjoy similar humidity levels.
Peace Lily — They share similar light requirements.

Similar species

Dendrobium — Another popular epiphytic orchid genus.
Cattleya — Often grown alongside moth orchids for their showy blooms.

Science

Family: Orchidaceae
Genus: Phalaenopsis
Order: Asparagales
Class: Liliopsida
Native range: Southeast Asia, Philippines, and Northern Australia.
Conservation: Many wild species are threatened by habitat loss and illegal collection.

They survive by clinging to tree branches and absorbing moisture and nutrients from the air and rain.

Value to wildlife: nectar source
Pollinators: bees, moths
Uses: indoor houseplant, floral arrangements

Through the year

JFMAMJJASOND

Flowering

Fruiting

Foliage

Ecological indicators

Moisture: 5/9
Salinity: 1/9
Soil reaction: 5/9
Light: 3/9
Nutrients: 2/9
Temperature: 8/9

Taxonomy resolved against GBIF.

Questions people ask

How often should I water my orchid?: Water when the roots turn silvery gray, usually once a week.
Why are my leaves turning yellow?: This is often a sign of too much direct sunlight or overwatering.

Where the name comes from

The genus name Phalaenopsis was coined by Carl Ludwig Blume in 1825.

Good to know

The name comes from the Greek words phalaina meaning moth and opsis meaning appearance.
They are often called moth orchids because the flowers resemble moths in flight.
These plants can bloom for several months at a time.
They prefer indirect light rather than direct sun.

Keep your moth orchid growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

Get the app

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.