Repotting Oncidium and Phalaenopsis: Step-by-Step for First-Timers

First-time repotting of an Oncidium (pseudobulb type) and Phalaenopsis (monopodial) requires slightly different approaches. Here's a clear, unified guide for both.

Universal Supplies

• Fir bark-based orchid mix (Lowe's, Home Depot, Charley's Greenhouse)
• Plastic pots with abundant drainage/air holes
• Sterile scissors, gloves
• Bucket for soaking bark

Phalaenopsis Repotting

1. Soak bark portion; save rest dry
2. Unpot, rinse roots thoroughly
3. Remove ALL mushy/brown roots
4. Healthy roots: firm, green when wet
5. Pot size: 1-2" larger if incorporating aerial roots
6. Rotate plant slowly into pot to guide roots down
7. Add wet bark, tap to settle
8. Water thoroughly

Oncidium Repotting

1. Same bark soak/unpot/rinse process
2. Remove dead roots and old pseudobulb sheaths
3. Position oldest pseudobulb against pot rim (room for new growth)
4. Newest growth toward center
5. Pot size: accommodate 2 years growth
6. Stake if unstable (rhizome clip or bamboo)
7. Add wet bark, tap, water

Light Preferences

• Phalaenopsis: East window (bright indirect)
• Oncidium: Brighter—south/west or supplemented
• Bloom trigger: Leaves should be light/medium green, not dark green

Post-Repot Care

• Water when bark nearly dry (check with skewer)
• Fertilize weakly weekly once new roots appear
• Repot both annually after flowering

Your Oncidium's vigorous growth (7 pseudobulbs!) and Phalaenopsis's aerial roots show both are ready. Repotting now prevents the root rot that kills more orchids than anything else.