Orchid Repotting: When and How to Repot Phalaenopsis

Understanding Phalaenopsis Orchid Roots and Repotting

Phalaenopsis (moth orchids) are epiphytes—they grow on tree bark in nature, not in soil. Their roots are adapted to air exposure and photosynthesis, which is why they often grow over the pot's edge. This is normal and healthy.

When to Repot

Repot every 1–2 years when the potting medium (bark or sphagnum moss) breaks down, becomes compacted, or stays soggy. Signs it's time:

• Medium smells sour or looks like fine dirt.
• Roots are brown/black and mushy (rot).
• Plant is unstable in the pot.

Pot Size Matters

Orchids prefer being slightly pot-bound. Usually, you can reuse the same size pot or go up only one size. A pot that's too large holds excess moisture and causes root rot.

Repotting Steps

1. Soak the orchid in water for 10 minutes to make roots pliable.
2. Gently remove old medium; trim dead roots (brown/mushy) with sterile scissors.
3. Place in new pot with fresh, damp orchid bark mix.
4. Do not water for 3–5 days to allow any cut roots to callous.

Key Takeaway

Aerial roots are not a sign the plant needs a bigger pot. They are a sign of a happy, healthy orchid. Repot based on medium condition, not root visibility.