Keep it warm. Avoid the cold draft.

Peace lilies are tropical. They're comfortable at the same temperatures you are — and miserable in the same drafts.

The unexpected killers

• A windowsill in winter. Glass radiates cold. Keep at least 8 inches off the pane.
• Above an air-conditioning vent. Constant cold blast = leaf curl + browning.
• Near an exterior door. Every winter open lowers the surrounding air by 20°F for minutes at a time.
• A car ride home in winter. Twenty minutes in a 35°F car can blacken every leaf.

Cold damage signs

Cold damage can look like sudden limp leaves, dark water-soaked patches, black leaf edges, or stems that collapse near the base. The damage may not show immediately; a chilled plant can look worse the next day.

Move the plant to a warm stable room, keep it out of direct sun, and avoid fertilizing. Trim blackened tissue only after you can see what is truly dead.

Heat stress signs

Hot rooms dry the pot faster and can curl leaves, crisp tips, or cause repeated wilting. Heat is worse when paired with low humidity or direct sun. If the room is above 85-90 F for long periods, check soil more often and move the plant away from hot glass or vents.

Outdoor temperature rule

A peace lily can enjoy warm shaded patio time, but it should come back indoors before chilly nights. Do not wait for frost. Cool drafts and cold soil are enough to slow or damage a tropical plant.

Winter placement checklist

In winter, place the plant where it gets the best available light without touching cold glass. Keep it away from exterior doors, unheated rooms, fireplaces, radiators, and heat vents. If the windowsill gets cold at night, move the plant back from the window after sunset or use a plant stand instead.

Water less often in cooler rooms because the plant uses water more slowly. Cold wet soil is more dangerous than cool air alone.

After a cold shock

If a peace lily was left in a cold car or near a freezing window, bring it into a warm room and wait. Do not repot immediately unless the soil is also soaked and sour. Do not fertilize. Let the damage declare itself over several days, then remove only tissue that is clearly dead.

Temperature and blooming

Stable warmth supports growth and blooms. A plant that is repeatedly chilled may survive but stall. If your peace lily looks healthy but never seems to move, check both light and nighttime temperature.

Room-by-room notes

Living rooms are often good if the plant is not beside a vent. Bedrooms can work, but cold windows at night are common. Kitchens may be warm and bright, but avoid placing the plant near ovens or exterior doors. Bathrooms are useful only when they have natural light and do not swing between steamy heat and cold drafts.

For a plant stand, choose a spot where the temperature feels boring. Peace lilies like boring. Sudden blasts of hot or cold air create more problems than a room that is simply a little cooler or warmer than ideal.

If you bring one home in winter

Wrap the plant before leaving the store, warm the car first, and go straight home. Even short cold exposure can mark leaves. Once home, let it settle before repotting or fertilizing.

If damage appears, keep the plant warm and steady. New healthy growth matters more than saving every marked old leaf.

How to check the real temperature

Room thermostats do not always describe the plant's spot. A windowsill, tile floor, entry table, or shelf above a vent can be much colder or hotter than the center of the room. Put a small thermometer beside the pot for one night if the plant keeps drooping, curling, or blackening without an obvious watering issue.

Check nighttime temperature as well as daytime temperature. Many homes are warm during the day and chilly near windows after dark, exactly when a peace lily is sitting still in wet soil.