Phalaenopsis Orchid Care: Complete Growing Guide

The moth orchid (Phalaenopsis) is the most popular orchid for home growers—and for good reason. Its elegant, long-lasting blooms (2–3 months indoors) and forgiving nature make it the ideal entry point into orchid cultivation.

Light Requirements

• Ideal: East or west window with bright, indirect light.
• Acceptable: South window with sheer curtain; north window in summer only.
• Artificial: 12–14 hours under fluorescent/LED grow lights 12 inches above foliage.
• Avoid: Direct midday sun—scorches leaves in minutes.

Leaf color indicates adequacy: bright grassy green = perfect. Dark green = too little light. Reddish edges = too much.

Temperature & Humidity

• Day: 75–80°F (24–27°C)
• Night: 60–65°F (16–18°C) — a 10–15°F drop triggers spike initiation in fall.
• Humidity: 50–75%. Use humidity tray (pebbles + water, pot elevated above water line) or room humidifier.

Watering Protocol

1. Water thoroughly when potting media is nearly dry (every 7–10 days typical).
2. Run tepid water through pot for 30 seconds; drain completely.
3. Never let sit in standing water—root rot is fatal.
4. Winter heating increases evaporation; check more frequently.

Fertilizing

Weakly, weekly: ¼-strength balanced fertilizer (20-20-20) every watering, or ½-strength every 2 weeks. Flush with plain water monthly to prevent salt buildup.

Reblooming Technique

After last flower fades, examine spike for nodes (fleshy bumps). Count 3 nodes from base; cut 1 inch above node #3. A healthy plant often produces a lateral spike with new buds. Repeat for near-continuous bloom cycles.

Repotting

Every 1–2 years in spring, after flowering. Use fresh orchid bark mix. Trim dead roots (brown/mushy); position plant so base of lowest leaf sits slightly above media.

Pest Watch

Inspect weekly for mealybugs, scale, spider mites. Treat with insecticidal soap or neem oil—spray early morning, repeat in 7 days.

With consistent care, a Phalaenopsis becomes a permanent, blooming fixture in your home.