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Black Stems Bacterial Rot on pothos

pothos with black stems bacterial rot

What's Happening

Black, mushy stems on pothos indicate bacterial soft rot (Erwinia chrysanthemi) that has progressed from compromised roots into the stem tissue. The bacteria break down parenchyma cells, causing characteristic slimy black decay that travels upward from soil line. Unlike fungal rot, bacterial rot spreads rapidly in warm, humid conditions.

How to Fix It

  1. 1

    Immediate action: Cut 2-3 inches ABOVE the blackened stem section with sterilized scissors—bacteria spread 1-2 inches past visible damage

  2. 2

    Inspect cut end: If tissue is still discolored, cut higher until only white/green healthy tissue is visible

  3. 3

    Sterilize cutting tool with 70% alcohol between EACH cut to prevent cross-contamination

  4. 4

    Dip cut end in cinnamon powder to seal and provide natural antibacterial barrier

  5. 5

    Root rescued cutting in fresh water or moist sterile perlite—do not return to contaminated soil

  6. 6

    Discard affected soil and sterilize pot with 10% bleach solution before reuse

How to Prevent It

Avoid overhead watering that wets stems; ensure good air circulation; water only at soil level; maintain 60-80% humidity without leaf wetness; quarantine new plants; use sterile potting mix; never reuse soil from infected plants.

Related Problems

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Frequently Asked Questions

What causes black stems bacterial rot on my plant?
Black, mushy stems on pothos indicate bacterial soft rot (Erwinia chrysanthemi) that has progressed from compromised roots into the stem tissue. The bacteria break down parenchyma cells, causing chara...
How do I fix black stems bacterial rot?
Immediate action: Cut 2-3 inches ABOVE the blackened stem section with sterilized scissors—bacteria spread 1-2 inches past visible damage. Inspect cut end: If tissue is still discolored, cut higher until only white/green healthy tissue is visible.
How do I prevent black stems bacterial rot from happening again?
Avoid overhead watering that wets stems; ensure good air circulation; water only at soil level; maintain 60-80% humidity without leaf wetness; quarantine new plants; use sterile potting mix; never reu...