Why is my orchid not blooming?

It likely needs a distinct drop in temperature at night during the winter to trigger flowering.

How often should I water it?

Water when the potting medium feels dry to the touch, usually once a week.

Plant guide

Dendrobium Orchid.

Dendrobium Sw.

Pronounced den-DROH-bee-um

Dendrobium nobile — Photo by Morten Ross (CC BY) via iNaturalist

Dendrobiums are a massive group of orchids known for their elegant, cane like stems and showy blooms. They are quite diverse, with many species hailing from tropical regions across Asia and Australia. You will find them to be rewarding plants if you can mimic their natural environment.

At a glance

Care level: Moderate
Plant type: Epiphytic orchid
Light: Bright, indirect light is best for most species.
Indoor light: Bright indirect
Water: Every 5 to 10 days
Mature size: 1 to 4 feet depending on the species.
Growth rate: Medium
Hardiness: USDA 9 to 12
Bloom time: Late winter to spring

Care

These orchids prefer a well draining potting mix designed specifically for epiphytes. Watch for shriveled pseudobulbs which indicate dehydration, or yellowing leaves that might suggest overwatering. Ensure they have good air circulation to keep fungal issues at bay.

Watering: Water when the potting medium is nearly dry to the touch.
Feeding: Use a balanced orchid fertilizer diluted to half strength during the growing season.
Pruning: Remove spent flower spikes once they have completely turned brown.
Repotting: Repot only when the potting medium begins to break down or the plant outgrows its container.
Soil: Orchid bark mix or sphagnum moss.
Soil pH: 5.5 to 6.5
Temperature: 10 to 28°C
Humidity: 60 to 80%
Drought tolerance: Moderate
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
Degraded potting medium
Plant becoming top heavy

Safety

People: The plant is generally non toxic but ingestion of plant parts is not recommended.
Pets: Dendrobium orchids are generally considered non toxic to cats and dogs.
Children: Keep out of reach to prevent accidental ingestion or damage to the delicate stems.
Contact allergens: Some people may experience mild skin irritation from handling the stems.
Airborne allergens: There is no significant evidence of respiratory allergies associated with this orchid.
Edibility: Dendrobium species are generally not considered edible and some may cause digestive upset.

How to identify it

Cane like pseudobulbs
Alternate leaf arrangement
Clusters of showy flowers
Fibrous root system

Height: 0.3 to 0.9m
Spread: 0.2 to 0.5m
Leaves: green, evergreen
Flowers: white, purple, yellow, pink, 3 to 8cm

Common problems

Scale — Small sap sucking insects that appear as brown bumps on leaves.
Root rot — Occurs when the potting medium stays too wet for too long.

Growing it

Propagation: division, keiki cuttings
When to plant: spring
Overwintering: Move indoors before the first frost and provide bright light. Reduce watering slightly during the cooler months to encourage a rest period.
In containers: They thrive in containers, specifically orchid pots with drainage holes, and prefer a tight root system.

Division

1. Remove the plant from its pot.
2. Gently tease the roots apart.
3. Ensure each section has at least three canes.
4. Repot in fresh orchid bark.

Group orchids together to create a microclimate with higher ambient humidity.

Grows well with

Phalaenopsis — They share similar light and humidity requirements.
Ferns — Ferns help maintain the high humidity levels these orchids prefer.

Similar species

Cattleya — Another popular epiphytic orchid with similar care needs.
Vanda — Also an epiphyte that appreciates high humidity and bright light.

Science

Family: Orchidaceae
Genus: Dendrobium
Order: Asparagales
Class: Liliopsida
Native range: Tropical and subtropical Asia and Australia.
Conservation: Many species are protected under CITES due to overcollection in the wild.

These orchids use their aerial roots to absorb moisture and nutrients from the air and rain.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: ornamental houseplant, cut flowers

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 5/9
Light: 6/9
Temperature: 8/9
Moisture: 5/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Why is my orchid not blooming?: It likely needs a distinct drop in temperature at night during the winter to trigger flowering.
How often should I water it?: Water when the potting medium feels dry to the touch, usually once a week.

Where the name comes from

The name Dendrobium reflects its natural habit of growing on trees in its native environment.

Good to know

The genus name comes from the Greek words dendron for tree and bios for life.
They are one of the largest orchid genera with over 1,500 species.
Some species produce small plantlets called keikis on their canes.

Is your dendrobium 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.