89% confidence Based on 20,000+ analyzed cases

Cold Damage on calathea

calathea with cold damage

What's Happening

Calathea are tropical plants that suffer chilling injury when temperatures drop below 60°F (15°C). Cold damage disrupts cellular membranes and enzyme function, causing leaf cells to rupture and leak fluids. Symptoms include dark, water-soaked patches on leaves that turn brown/black as tissue dies. Unlike fungal issues (which spread gradually), cold damage appears suddenly after exposure to cold drafts, open windows, or AC vents. Recovery is often impossible for severely damaged tissue.

How to Fix It

  1. 1

    Move plant immediately to stable 65-80°F location away from drafts

  2. 2

    Trim damaged leaves at base with sterile scissors - do not leave partial damage

  3. 3

    Increase humidity to 70%+ to reduce further stress

  4. 4

    Avoid fertilizing until new growth appears (4-8 weeks)

  5. 5

    Monitor for secondary fungal infection in damaged areas

How to Prevent It

Never place near entryways, open windows, or AC vents. Use thermometer to verify location stays 65°F minimum. Move plants away from windowsills in winter. Avoid purchasing during cold weather unless properly packaged.

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Frequently Asked Questions

What causes cold damage on my plant?
Calathea are tropical plants that suffer chilling injury when temperatures drop below 60°F (15°C). Cold damage disrupts cellular membranes and enzyme function, causing leaf cells to rupture and leak f...
How do I fix cold damage?
Move plant immediately to stable 65-80°F location away from drafts. Trim damaged leaves at base with sterile scissors - do not leave partial damage.
How do I prevent cold damage from happening again?
Never place near entryways, open windows, or AC vents. Use thermometer to verify location stays 65°F minimum. Move plants away from windowsills in winter. Avoid purchasing during cold weather unless p...