How to Repot Orchids: Step-by-Step Guide for Phalaenopsis, Cattleya, and Dendrobium

By Michael Chen · July 21, 2026

When to Repot Your Orchid

Orchids typically need repotting every 1-2 years. Repot when you observe:

Roots growing over the pot edge — the plant has outgrown its container
Media breakdown — bark or moss becomes mushy or smells sour
Poor drainage — water pools on the surface
Root rot visible — brown, mushy roots instead of firm, silvery-green ones
After flowering — the ideal window is right after the bloom spike finishes

Never repot during active flowering unless the plant is in immediate danger.

Choosing the Right Pot and Media

Pot Selection

Clear plastic pots — best choice for monitoring roots
Terra cotta — good for heavy-watering growers
Size rule: Only 2-3cm larger than the root mass

Growing Media by Orchid Type

Orchid Type	Best Media	Why
Phalaenopsis	Medium bark + perlite (3:1)	Balances moisture and airflow
Cattleya	Coarse bark + charcoal (4:1)	Fast drying between waterings
Dendrobium	Medium bark + lava rock (2:1)	Stability and drainage
Paphiopedilum	Fine bark + perlite + sphagnum (2:1:1)	More moisture retention

Step-by-Step Repotting Process

Step 1: Preparation (Day Before)

Water the orchid thoroughly — hydrated roots are flexible
Sterilize scissors with rubbing alcohol
Pre-soak new bark media for 1-2 hours

Step 2: Remove from Old Pot

Turn pot sideways and gently squeeze to loosen root ball
Slide the plant out carefully

Step 3: Clean the Root System

Remove all old media by hand
Rinse roots under lukewarm water
Cut away dead roots (brown, mushy, hollow) with sterile scissors

Step 4: Position in New Pot

Place drainage layer over holes
Add base layer of pre-soaked media
Position orchid — base of lowest leaves just above media surface
Fill around roots with media, tapping to settle — do NOT pack tightly

Step 5: Post-Repot Care

Day 1-3: Do NOT water — let root cuts callous
Day 4: Water thoroughly with lukewarm water
Week 1-2: Keep in lower light (50% of normal)
Week 3-4: Gradually return to normal light
Week 4+: Resume regular care, begin diluted fertilizer

Special Cases

Orchid with Mostly Dead Roots

Place in a clear bag with damp sphagnum moss (humidity tent). New root tips appear in 2-6 weeks. Pot normally once you see 3+ new roots.

Keiki (Baby Plant) on the Spike

Wait until the keiki has 3+ roots of at least 5cm. Cut the spike 2cm above and below. Pot in fine bark + sphagnum.

Back Bulb Division (Cattleya)

Divide when plant has 8+ pseudobulbs. Each division needs at least 3 pseudobulbs with live roots. Dust cuts with cinnamon.

No Bloom After Repotting

Orchids may take 6-12 months to bloom after repotting. Ensure adequate light and maintain a 5-8°C temperature drop at night.

Common Repotting Mistakes

Using regular potting soil — roots suffocate
Choosing too large a pot — excess media stays wet
Packing media too tightly — roots need air pockets
Watering immediately after repotting — open wounds + wet media = rot
Returning to full sun immediately — stressed plants burn

Conclusion

Repotting orchids is straightforward: repot at the right time, use appropriate media, handle roots gently, and give the plant a recovery period. Your orchid will reward you with vigorous growth and spectacular blooms within 6-12 months.