Dendrobium Orchid Care: A Complete Indoor Guide
Dendrobium is the second-largest orchid genus on earth — over 1,800 species — so 'Dendrobium care' depends on which type you have. The two you'll meet at the garden centre are nobile-type (Dendrobium nobile and its hybrids) and phalaenopsis-type (often sold as 'Dendrobium phal').
Both want more light than a Phalaenopsis and a meaningful winter cool-down to bloom. Here's how to handle each.
Identify your Dendrobium type
Nobile-type: tall cane-like pseudobulbs with paired leaves down the entire length. Flowers emerge from nodes along the cane.
Phalaenopsis-type: thinner upright canes with leaves only at the top. Flower spike emerges from the top of a mature cane.
Care diverges most in winter, so identifying the type matters.
Light
Brighter than Phalaenopsis. Aim for a south- or west-facing window with sheer curtain protection from harsh midday sun. Leaves should be a light yellow-green; dark green leaves mean too little light.
Insufficient light is the #1 reason Dendrobiums grow leaves but never bloom.
Water
During active growth (spring–autumn): water heavily as the medium approaches dryness, usually every 5–7 days. Dendrobiums grow fast and drink a lot in summer.
Use room-temperature water, drain completely, and avoid water on the cane itself overnight.
The winter rest (the part most growers skip)
Nobile-type Dendrobiums need a strict dry, cool winter rest from late autumn through early spring. Reduce watering to once every 2–3 weeks (just enough to stop the canes shrivelling), stop fertilizer entirely, and keep nights between 10–13 °C / 50–55 °F.
Without this rest, nobile types push leafy 'keiki' offshoots instead of flowers. With it, you'll see buds along the canes in late winter.
Phalaenopsis-type Dendrobiums need only a mild rest — keep watering moderately and skip the cold, but reduce fertilizer for 6–8 weeks in winter.
Fertilizer
Feed weekly with quarter-strength balanced 20-20-20 from spring through late summer. Switch to a bloom booster (10-30-20) twice in early autumn, then stop entirely for the winter rest.
Repotting
Every 2–3 years in spring as new growth emerges. Use medium fir bark and a snug pot — Dendrobiums dislike oversized pots and bloom best when slightly cramped.
Avoid repotting during the winter rest or while flowering.
Frequently asked questions
- Why is my Dendrobium dropping leaves in winter?
- Nobile types are partly deciduous — losing leaves in winter is normal and a sign the rest period is working. Phalaenopsis types should keep their leaves; sudden leaf loss means cold damage or overwatering.
- Should I cut off old canes?
- No. Old leafless canes (called back bulbs) store energy and can rebloom or push keikis. Only cut canes that turn fully brown and shrivel.
- What's a keiki?
- A baby plant that grows from a node on the parent cane. Once it has 2–3 roots over 3 cm long, you can detach and pot it separately.