Indoor plants in winter: light, heating, watering and pests

Less light, shorter days

In winter the sun is low and the days are short, so a spot that was bright in summer may now be too dim. Plants respond by growing slowly or stretching toward the window.

• Move plants closer to the brightest window, especially those that need strong light, such as cacti and succulents.
• Wipe dust off large leaves with a damp cloth so they catch more of the weak light.
• Turn pots a quarter turn every week or two to keep growth even (estimated).
• If no window is bright enough, extra artificial light can fill the gap.

Heating, radiators and dry air

Central heating makes rooms warm but dry, and direct heat dries leaves and potting mix quickly.

• Keep plants away from radiators, heat vents, stoves and fireplaces.
• Many houseplants prefer 40–50% relative humidity, which is often more than a heated room offers.
• Grouping plants together raises humidity a little; a humidifier does more.
• Ferns, prayer plants and calatheas cope better in a bright bathroom or kitchen.

Temperatures plants like in winter

Most foliage plants are comfortable at about 65–70°F during the day and 60–65°F at night. Steady temperatures matter more than exact numbers.

Watering less, and doing it well

With less light and slower growth, roots take up much less water. Overwatering is the most common winter mistake.

• Water only when the top 1 in of mix feels dry, or push a wooden chopstick into the pot: if soil sticks to it, wait.
• A plant that needed water daily outdoors in summer may need it only weekly indoors in winter, or less.
• When you do water, water thoroughly until it runs from the drainage holes.
• Let the pot drain for 15–30 minutes, then empty the saucer. Never leave roots in standing water.
• Use pots with drainage holes and water at room temperature (estimated).

Pausing fertilizer

Plants growing slowly in low light use very little fertilizer. Extra feed is not taken up and builds up as salts that can damage roots.

• Reduce or stop feeding through the darkest months.
• Start again in spring, when new leaves appear. Always follow the instructions on the product label.
• Avoid repotting in winter too, unless it is truly necessary.
• A white crust on the mix or pot rim is a sign of salt buildup; flushing the pot with plain water helps.

Cold glass and drafts

A window can be bright and cold at the same time. Glass loses heat at night, and leaves that touch it can be chilled or damaged.

• Keep leaves from touching the glass.
• At night, do not leave plants trapped between a closed curtain and the window.
• Keep plants away from outer doors and leaky windows that let in cold drafts.
• Draft from a vent or open window can cause sudden leaf drop, even in a warm room.

⚠️ Sudden leaf drop in winter is often caused by a cold draft or a big temperature swing, not by disease.

Finding a winter spot, step by step

1. Walk around your home on a sunny day and note which windows get the most light.
2. Move light lovers like cacti and succulents to the brightest window.
3. Move leafy tropical plants a little back from the glass so leaves cannot touch it.
4. Check that no plant sits directly above a radiator or in front of a heat vent.
5. Keep plants away from outer doors and drafty windows.
6. Group humidity lovers together, or move them to a bright bathroom.
7. Check every few days at first: a plant that wilts, yellows or drops leaves may need another spot.

Pests that like a warm, dry room

Dry, warm rooms suit several pests, and plants that are already stressed attract them more.

• Spider mites: fine webbing and pale speckled leaves, common in dry air.
• Aphids: small soft insects and sticky honeydew.
• Mealybugs: white, cottony clusters in leaf joints.
• Scale: brown bumps along stems and leaf veins.
• Fungus gnats: tiny flies around wet mix; a sign of overwatering.

Check the undersides of leaves every time you water. Yellow sticky traps laid flat on the mix help to catch fungus gnats. Isolate any plant with pests.

Common winter problems

Frequently asked questions

Houseplants that need winter attention

CalatheaBoston fernChristmas CactusAfrican VioletEcheveriaSnake PlantPothosFiddle-Leaf Fig