Can I use fertilizer to force blooms?

Fertilizer helps overall health, but it will not force a bloom if the temperature and light conditions are not met. Focus on the cooling period first.

How long should the cool period last?

Aim for 3 to 4 weeks of cooler nights in the fall. This is usually enough to signal the plant to start developing flower buds.

Why is my Dendrobium orchid not flowering?

Check these first

Check the light levels in your current spot.
Monitor the night temperatures for a few weeks.
Inspect the plant for healthy new growth.

Likely causes

Lack of temperature drop
Most likely
How to tell: The plant looks healthy and green but shows no signs of new spikes. It has been kept in a room with constant temperatures year round.
What to do: Move your orchid to a spot where night temperatures drop to 50 to 55 degrees Fahrenheit for 4 weeks in autumn. Keep it in a cool garage or near a drafty window during this time to trigger the bloom cycle.
Insufficient light
Most likely
How to tell: The leaves are a dark, forest green color rather than a bright grassy green. The plant is not producing new growth.
What to do: Move the plant to a brighter location with more indirect sunlight. If you do not have a bright window, consider using a grow light for 10 to 12 hours a day.

When to worry

Do not worry if the plant is still young, as it needs to reach a certain size before blooming. It is only a concern if the plant is mature and has not bloomed for over two years.

Stopping it coming back

Provide a clear seasonal shift by cooling the plant down in the fall and ensuring it gets plenty of bright, indirect light.

Not sure which one it is? Photograph your dendrobium orchid.

This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Can I use fertilizer to force blooms?: Fertilizer helps overall health, but it will not force a bloom if the temperature and light conditions are not met. Focus on the cooling period first.
How long should the cool period last?: Aim for 3 to 4 weeks of cooler nights in the fall. This is usually enough to signal the plant to start developing flower buds.