Stem Rot on philodendron
What's Happening
Stem rot (bacterial soft rot) in Philodendron occurs when moisture accumulates at the stem base or leaf axils, creating entry points for Erwinia chrysanthemi and other bacteria. Unlike root rot which affects below-soil tissue, stem rot targets above-ground meristematic tissue. Symptoms include soft, mushy tissue at soil line, foul odor, and progressive yellowing of attached leaves. High humidity without adequate airflow is the primary trigger, especially in self-heading varieties with dense leaf clusters.
How to Fix It
- 1
Immediate inspection: Unpot plant and examine stem base—healthy tissue is firm and pale green/white
- 2
Surgical removal: Trim ALL soft, discolored, or mushy stem tissue with sterilized razor until only firm white tissue remains
- 3
Sterilize cut surfaces: Apply cinnamon powder or diluted hydrogen peroxide to seal wounds
- 4
Allow callusing: Lay plant on dry paper towel in shade for 48 hours to seal cut wounds
- 5
Repot shallow: Replant at same or slightly higher level to keep stem above soil line
- 6
Modify environment: Increase airflow with fan; reduce humidity temporarily to 40-50%
How to Prevent It
Water at soil level only, avoiding leaf and stem wetting; maintain 40-60% humidity with active air circulation (small fan); ensure pots have drainage and saucers are emptied promptly; avoid deep planting where stems contact moist soil.
Related Problems
Same Problem on Other Plants
Go Deeper
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