Guide
How to Care for a Moth Orchid (Phalaenopsis)
The short answer
Moth orchids (Phalaenopsis) thrive in indirect light from an east or west window and normal room temperatures. Water about weekly using University of Maryland Extension's method: 3 or 4 drenches over a 10-minute period so the bark gradually absorbs water — the aerial roots turn from dull silver-white to pale green when the plant has had enough. Grow them in a commercial orchid bark mix with excellent drainage, never in regular potting soil.
If your orchid won't rebloom, low light is the most common cause. Give it more bright, indirect light, allow cooler night temperatures in fall, and after flowering cut the spike back to about half an inch above the second node to encourage branching and reflowering.
What a Moth Orchid Is
Phalaenopsis, the moth orchid, is the most common orchid sold as a houseplant. It grows with thick aerial roots in loose bark rather than soil, and its long-lasting flower spikes can rebloom with the right care.
Light
Give indirect light from an east or west window; in winter, plants tolerate more direct light or a south-facing spot. Read the leaves: proper light produces light green leaves, too little light gives dark stiff foliage, and too much causes pink or reddish margins and yellowing.
Watering
Water roughly weekly by giving 3 or 4 drenches over about 10 minutes so the bark absorbs water gradually. Misting alone is not adequate indoors. Aerial roots turn pale green when the plant has absorbed enough water.
⚠ Overwatering and poor drainage lead to root rot — the pot must drain freely, and pebble trays must not be flooded to the point the roots stay wet.
Potting Media and Repotting
Use a commercial orchid bark mix in a container with excellent drainage. Replace the media every 1–2 years before it breaks down, repotting when new growth has started or when the plant outgrows its container.
Humidity, Temperature, and Feeding
Moth orchids do well at normal room temperatures. Pebble trays under the pots raise humidity — low humidity shows up as wrinkled leaves. Fertilize every third or fourth watering with a commercial orchid fertilizer, and skip feeding in winter; over-fertilizing reduces flowers.
Getting It to Rebloom
- 1Raise the light — Low light is the most common cause of no flowers — move the plant to brighter indirect light.
- 2Give a fall cool-down — Allow cooler night temperatures in fall; if summering outdoors, bring plants in when evenings dip into the fifties.
- 3Cut the old spike — Prune the finished spike back to about half an inch above the second node to encourage branching and reflowering.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- University of Maryland Extension — Care of Phalaenopsis Orchids (Moth Orchids) — East/west window indirect light and leaf-color cues, weekly drench watering method and root-color check, orchid bark mix with drainage, repot every 1–2 years, pebble-tray humidity, fertilize every 3rd–4th watering, rebloom via more light + cool fall nights + cutting spike above second node