cold damage on Calathea
Quick answer
If your Calathea has cold damage, the most likely cause is: 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.
Start here:
- 1. Move plant immediately to stable 65-80°F location away from drafts
- 2. Trim damaged leaves at base with sterile scissors - do not leave partial damage
Why Calathea gets cold damage
Goeppertia spp.
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.
Other documented causes on calathea:
- • Calatheas are tropical plants sensitive to temperatures below 60°F/15°C. Cold damage occurs from exposure to cold drafts, winter window proximity, or transportation in cold weather. Symptoms include water-soaked dark spots, browning, wilting, and leaf collapse. Cellular damage happens when water in plant tissues freezes and ruptures cell walls. Unlike root rot (progressive decline), cold damage appears suddenly after temperature exposure. Rhizomes often survive even when foliage appears dead.
How to reverse cold damage on Calathea
- 1
Move plant immediately to stable 65-80°F location away from drafts
- 2
Trim damaged leaves at base with sterile scissors - do not leave partial damage
- 3
Increase humidity to 70%+ to reduce further stress
- 4
Avoid fertilizing until new growth appears (4-8 weeks)
- 5
Monitor for secondary fungal infection in damaged areas
Keep cold damage off this Calathea
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.