Root Rot Crown Rot Progression on phalaenopsis orchid
What's Happening
Untreated root rot advances upward through the vascular system into the crown—the central meristematic tissue where all leaves and roots originate. When anaerobic bacteria (Erwinia chrysanthemi, Pythium spp.) colonize the crown, the plant loses its ability to regenerate any new growth. Crown rot appears as yellowing at leaf bases, softening of central tissue, and characteristic foul odor. Unlike root rot alone (recoverable), crown rot is typically fatal within 2-4 weeks as the plant's entire growth center liquefies.
How to Fix It
- 1
Immediate crown inspection: Gently separate lower leaves and examine central tissue—healthy crown is firm and pale green
- 2
If crown is firm: Treat as root rot—trim affected roots, sterilize with H2O2, repot with crown exposed to air
- 3
If crown is soft/yellow: Attempt crown rot surgery only if rot is localized to outer tissue
- 4
Surgical option: Use sterile razor to excise all soft tissue until only firm white meristem remains
- 5
Post-surgery care: Treat cuts with cinnamon, maintain 80%+ humidity in recovery chamber, avoid all watering at crown
- 6
Realistic prognosis: Crown rot affecting central meristem has <20% survival rate—propagate from basal keikis if any viable tissue remains
How to Prevent It
Prevent crown rot by treating root rot at first signs of texture change. Never allow water to pool at leaf bases or crown—water only at pot edge, never overhead. Ensure crown sits above pot rim for maximum airflow. Quarantine new plants for 14 days to inspect for early crown infections before introducing to collection.