Phalaenopsis Orchid Care: The Complete Indoor Guide
The Phalaenopsis — or moth orchid — is the orchid you almost certainly bought at the supermarket. It's also genuinely one of the easiest houseplants once you treat it like the tropical epiphyte it is, not a regular potted plant.
This guide covers the five things that matter most: light, water, humidity, feeding, and getting it to bloom again.
Light
Phalaenopsis want bright, indirect light. An east-facing window is ideal. North-facing works in summer. South or west windows need a sheer curtain to diffuse the harsh afternoon sun.
A reliable rule: if the leaves are dark forest green, the plant wants more light. Healthy Phalaenopsis leaves should be a vibrant grass green.
Water
Water roughly every 7–10 days in summer, every 10–14 in winter. Soak the bark thoroughly under room-temperature water, drain completely, never leave the plant standing in water.
The clear inner pots they come in are a feature, not a defect — they let you see the roots. Bright green roots = hydrated. Silvery white = thirsty.
Humidity and temperature
Phalaenopsis thrive at 50–70% humidity and 18–27 °C (65–80 °F). In dry homes, group plants together or set the pot on a humidity tray (gravel + water, pot above the waterline).
Crucially, give them a 5–10 °C night-time temperature drop in autumn — this is what triggers a new flower spike.
Fertilizer
Feed weakly, weekly. Use a balanced orchid fertilizer (e.g. 20-20-20) at quarter-strength every time you water. Once a month, flush with plain water to stop salt build-up.
Skip fertilizer entirely while the plant is in full bloom — feeding can shorten the flowering display.
Repotting
Repot every 18–24 months, or whenever the bark breaks down to crumbles. The best time is just after blooming, when new roots start to grow. Use orchid bark, never regular potting soil.
How to make a Phalaenopsis rebloom
After flowering, cut the spike just above a node — sometimes a side spike will emerge. Then move the plant somewhere with cooler nights (15–18 °C / 60–65 °F) for 4–6 weeks in autumn. This temperature drop is the single most reliable bloom trigger.
Once a new spike appears, return to normal warmth and stake it gently. Expect blooms in 2–3 months.
Frequently asked questions
- How long do Phalaenopsis blooms last?
- Two to four months is typical. Cooler rooms hold blooms longer.
- Should I cut the flower spike after blooming?
- Cut just above the second node from the base. The plant may push a secondary spike from that node, or rest and bloom from a fresh spike next season.
- Why are the leaves limp?
- Almost always a root problem — either rotted from overwatering or shrivelled from underwatering. Check the roots before adjusting anything else.