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Corm Rot on oxalis triangularis

oxalis triangularis with corm rot

What's Happening

Oxalis triangularis corms (underground storage organs) are highly susceptible to anaerobic conditions and bacterial rot when soil remains saturated for 5+ days. Unlike typical fibrous roots, the contractile root system adapted for corm positioning cannot tolerate waterlogged conditions. Erwinia and Pythium species colonize saturated substrate, attacking the corm's basal plate and spreading to daughter corms, causing rapid decline.

How to Fix It

  1. 1

    1. Immediate unpotting and inspection: Remove all soil, examine corms for soft/mushy spots or foul odor

  2. 2

    2. Surgical removal: Trim ALL rotted corm tissue with sterilized blade until only firm, white tissue remains

  3. 3

    3. Sterilization soak: Submerge corms in 3% hydrogen peroxide solution for 15 minutes

  4. 4

    4. Callus period: Air dry treated corms on paper towel in shade for 48-72 hours

  5. 5

    5. Repot in bone-dry mix: Use fresh, dry well-draining soil; wait 7 days before first light watering

How to Prevent It

Use extremely well-draining mix (50% perlite/pumice + 25% orchid bark + 25% potting soil); water only when top 1-2 inches completely dry; employ terracotta pots to wick excess moisture; ensure drainage holes exceed 1/4 inch diameter.

Related Problems

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Frequently Asked Questions

What causes corm rot on my plant?
Oxalis triangularis corms (underground storage organs) are highly susceptible to anaerobic conditions and bacterial rot when soil remains saturated for 5+ days. Unlike typical fibrous roots, the contr...
How do I fix corm rot?
1. Immediate unpotting and inspection: Remove all soil, examine corms for soft/mushy spots or foul odor. 2. Surgical removal: Trim ALL rotted corm tissue with sterilized blade until only firm, white tissue remains.
How do I prevent corm rot from happening again?
Use extremely well-draining mix (50% perlite/pumice + 25% orchid bark + 25% potting soil); water only when top 1-2 inches completely dry; employ terracotta pots to wick excess moisture; ensure drainag...