How to Get a Moth Orchid to Rebloom
Most large-flowered moth orchids need 2 to 3 weeks of cooler nights in fall, about 15 F below daytime, plus bright indirect light, to start a new flower s...
Published by ThriveThyme
orchid phalaenopsis houseplants rebloom
The Short Answer
Give it bright, indirect light and a few weeks of cooler nights in fall. The American Orchid Society says winter-blooming moth orchids need nights about 15 F cooler than days for two or three weeks to start a flower spike. NC State says the large-flowered types need a cool spell near 55 F for about a week in autumn.
Low light is the most common reason a moth orchid does not rebloom (Maryland Extension). Fix that first.
Track it with your other holiday plants on the Holiday Rebloom Desk.
How to Give It Cool Nights
- A cool spare room, or a spot near a window that cools off at night.
- Turn the thermostat down at night (American Orchid Society).
- If it summered outdoors, Maryland Extension suggests leaving it out until nights dip into the 50s, then bringing it in.
Keep days warmer than nights, under about 84 F. Nights in the mid 70s can stop spikes from forming (American Orchid Society).
The newer dwarf hybrids, bred from summer-flowering species, do not need a cool spell (NC State).
Light and Water
- An east window is ideal. Well-shaded south or west windows also work (NC State).
- Water when the bark looks pale and the pot feels light. Let it drain fully. Never let it sit in water (NC State).
- Feed lightly while it grows. Skip feeding in the cool, dim months (Maryland).
The Old Flower Spike
After the flowers fall, watch the old spike. It may branch and bloom again (Maryland). To try for that, cut a green spike just above the first or second node below the faded flowers (NC State, Maryland). Cut a yellow or brown spike off at the base.
After a Spike Appears
Go back to normal room care with bright, indirect light. The cool spell has done its job.
Pets
The ASPCA lists the moth orchid (Phalaenopsis) as non-toxic to dogs and cats. See pet-safe houseplants.
Next Steps
- Light and water by window: moth orchid care.
- Plan holiday plants on the Holiday Rebloom Desk.
- Read Thanksgiving vs Christmas cactus.