Environment & care
Cold & draught damage
Sudden blackened, water-soaked or limp patches after a cold night, a draughty window or a chilly car ride home.
What you'd see
- Dark, water-soaked or translucent patches appearing overnight
- Leaves collapsing limp then turning black or papery
- Sudden leaf drop, sometimes of green leaves (ficus, croton)
- Damage on the side facing a window or door
Where to look
Windowsills behind curtains on winter nights, draughts from doors, plants transported in the cold, air-conditioning vents in summer.
How it spreads
Not infectious. Damage stops once the exposure stops.
Is it really this? Look-alikes
- Root rot — Rot builds over days with wet soil; cold damage arrives overnight.
- Bacterial leaf spot — Spots multiply over a week; cold damage all appears at once.
What's going on
Most houseplants are tropical. Below about 10–12 °C (50–55 °F) their cell membranes stiffen and leak; frost forms ice crystals that shred cells. The leaf turns dark because its contents have spilled.
Cold roots also stop taking up water, so a chilled plant may wilt in wet soil — and mistakenly get watered again.
Why?
Knowing the injury happened in a single night tells you to look for the event: the curtain drawn across the sill, the door left open, the drive home. Fix the exposure, do not water more, and wait for new growth before judging.
Grandmother's remedies
What people have always done — with an honest note on each.
Bring them in off the sill at night
Move plants a metre away from cold glass in winter or slip cardboard between glass and plant.
Verdict: Simple and effective.
Wrap for the journey
Sleeve plants in paper or a bag for transport in cold weather.
Verdict: Prevents most cold-shock leaf drop after buying.
Modern remedies
What growers and extension services reach for today.
Wait, then trim
Leave damaged leaves until you can see what is dead, then remove to clean tissue.
Verdict: Correct; premature trimming removes tissue that would have recovered.
Check the roots
If the plant stays wilted with wet soil for a week, check for rot.
Verdict: Sensible — cold and rot travel together.
Honest verdict
Cold damage looks dramatic but the plant often survives if the growing point is intact. Patience beats intervention.
Prevention
- Keep tropicals away from cold glass and draughts
- Never leave plants between curtain and window on winter nights
- Wrap for cold transport
Plants this commonly troubles
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