Phalaenopsis Orchid Care Guide — Watering, Fertilizer, Pests & Temperature
Phalaenopsis orchids are among the easiest orchids to grow, but proper care makes a big difference in plant health and flowering.
After more than 40 years growing Phalaenopsis, these are the key factors I focus on: water quality, pest prevention, temperature, humidity, and fertilizer use.
Water Quality for Phalaenopsis Orchids
For small collections, distilled water, reverse-osmosis (RO) water, or rainwater works best. Phalaenopsis prefer good-quality water. Tap water in some areas contains high mineral levels (especially calcium), which can slowly accumulate in the potting media and on roots.
If you must use tap water, flushing the pot thoroughly with plain water from time to time helps reduce salt buildup.
Common Phalaenopsis Orchid Pests
A quick weekly inspection is usually enough to stay ahead of pests. Check both the top and underside of leaves and wipe them if needed.
Most infestations happen when growers have too many plants to monitor closely. Healthy plants kept under good conditions rarely require constant pesticide treatments.
Routine spraying every few days is usually unnecessary.
Temperature and Humidity for Phalaenopsis
Phalaenopsis are tropical orchids and grow best when kept warm with higher humidity at night. They thrive in daytime temperatures of 78–85°F, with stable conditions throughout the day and night.
A heat mat can be helpful during cooler months to keep root temperatures around 70°F (21°C) when room temperatures drop.
How to Fertilize Phalaenopsis Orchids
Use a weak fertilizer solution, about ¼ of the recommended strength, and apply it only when the plant is actively growing (when you see new roots or a new leaf).
If the plant is not actively growing, use plain water instead.
Frequently Asked Questions
How often should Phalaenopsis orchids be watered?
Water when the potting media approaches dryness. Most growers water about once a week depending on humidity and pot size.
Should I fertilize orchids every time I water?
No. Fertilizer should only be applied when the plant is actively growing new roots or leaves.
What pests attack Phalaenopsis orchids?
Common pests include mealybugs, scale, and spider mites. Regular inspection of leaves usually prevents serious infestations.
If you're looking for healthy Phalaenopsis orchids, you can see available plants at Big Leaf Orchids.