Phalaenopsis Orchid Care Guide

Temperature
Phalaenopsis are tropical plants that thrive in warm conditions. The ideal temperature range is 78°F to 82°F during the day, with nighttime humidity of 60% or higher.

For spring-flowering Phalaenopsis, flowering is triggered by lowering nighttime temperatures to 62°F for two weeks.
For summer-flowering varieties (e.g., Novelty Phalaenopsis), flowering is encouraged by warmer temperatures around 82°F and longer daylight hours.

Watering

Potted Phalaenopsis: Water when the potting medium is nearly dry. Dry roots appear silver in color.
Phalaenopsis in sphagnum moss: Water every 7 to 10 days.
Mounted Phalaenopsis (on plaques or in baskets): Daily watering is necessary as roots dry out quickly.

As epiphytes, Phalaenopsis do not tolerate prolonged wet roots. Root rot can occur if temperatures drop below 70°F.

Light
Phalaenopsis require bright, indirect light with about 70% shade. Direct sunlight can cause permanent leaf damage.

Humidity
These orchids thrive in 50% to 80% humidity at night. Since Phalaenopsis are CAM (Crassulacean Acid Metabolism) plants, they store carbon dioxide (CO₂) at night for photosynthesis during the day. If humidity is too low, they cannot efficiently produce food.

Fertilizing
Fertilize Phalaenopsis during active growth, which is indicated by new leaves or root tips. Over-fertilization can cause tip burn on leaves and roots.

When grown in sphagnum moss, use a diluted fertilizer at ¼ of the manufacturer’s recommendation.
- Example: If the label suggests 1 teaspoon per gallon of water, reduce it to ¼ teaspoon per gallon.

Placement
For optimal growth, place Phalaenopsis near a bright east- or south-facing window while avoiding direct sunlight. Keep them away from air vents that blow hot or cold air directly onto the plant.

revised: March 20, 2025