Cold Damage and Frost Injury 🦠
At a glance
- Cause: Cold air, frost, cold glass, drafts, or sudden temperature drops
- Tell-tale sign: Water-soaked tissue that darkens, collapses, or turns papery after a cold event
- Severity: Minor on leaf tips; serious if stems/crowns freeze
How to identify
Cold damage often appears shortly after a chilly night, draft, shipping exposure, frost, or contact with cold window glass. Leaves may look water-soaked, limp, translucent, blackened, or papery. Tender tropical plants can show damage well above freezing if they are exposed long enough.
What causes it
Cold injures plant cells directly and can rupture tissue. Damage is worst on tender new growth, tropical houseplants, succulents with watery tissue, and actively growing plants hit by sudden cold.
Treatment & management
Following Integrated Pest Management:
- Move the plant out of the cold and stabilize temperatures.
- Wait before pruning unless tissue is mushy; some damage takes days to show.
- Remove fully collapsed or rotting tissue with clean tools.
- Water carefully while roots recover; cold-stressed plants use less water.
- Do not fertilize immediately; wait for new healthy growth.
Prevention
Keep houseplants away from cold glass and drafts, protect tender outdoor plants before frost, and harden plants gradually before exposure.
Affects (in this guide)
Tropical houseplants, succulents, tender new growth, seedlings, and frost-sensitive outdoor ornamentals