How to Care for Houseplants in Winter: 8 Changes That Keep Them Healthy Until Spring

Your plants sit on the windowsill under a gray sky, a radiator hissing below them, and a few lower leaves have started turning yellow.

Learning how to care for houseplants in winter mostly means adjusting habits that worked fine in July but cause trouble once days shorten and the heat comes on.

The short version: Water less often, move plants closer to your brightest windows, and keep them away from cold glass, drafts, and direct blasts of heat. Raise humidity if the air feels dry, pause most fertilizing, and check leaves for pests every week or two.

This guide covers watering, light, temperature, humidity, cold damage, feeding, repotting, pests, and pet safety for the colder months.

At a Glance

Factor	What it needs
Light	Brightest available window, or a grow light for 12 to 14 hours a day
Water	Less often than summer; check soil before every watering
Humidity	40 to 60 percent for most tropicals; heated rooms often fall to 10 to 30 percent
Temperature	60 to 75°F for most common houseplants; keep tropicals above 50°F
Soil	Well-draining mix that dries between waterings; no soggy pots
Pet safety	Varies by plant; check each species against the ASPCA list
Difficulty	Easy once you shift to a slower winter routine

How to Care for Houseplants in Winter: What Actually Changes

Winter brings less light, drier air, and wider temperature swings near windows, so most houseplants slow their growth. A slower plant uses less water and food, which is why summer routines often lead to rot and yellowing in winter.

Shorter Days Mean Slower Growth

Plants make energy from light, and in December a north-facing room in Chicago may get only a few hours of useful light. With less energy coming in, roots take up water slowly, and new leaves appear less often or not at all.

This slowdown is normal. A plant that holds steady through winter without much new growth is usually doing fine.

Heating Changes the Air Around Your Plants

Forced-air heat and radiators warm a room while pulling relative humidity down sharply. Meanwhile, the glass beside your plant can be 20 or more degrees colder than the middle of the room on a frosty night.

A digital thermometer-hygrometer placed near your plant shelf shows you what the plants actually experience. If you find your windows simply too dim, a full-spectrum LED grow light fills the gap better than any amount of rearranging.

What Stays the Same

Plants still need drainage holes, clean leaves, and soil that is never waterlogged. The basics do not change; only the pace does.

How Often Should You Water Houseplants in Winter?

Water only when the soil reaches the right dryness for that plant, which usually means every 1.5 to 3 times longer between waterings than in summer. Overwatering is the most common winter killer of houseplants.

Check the Soil, Not the Calendar

Push a finger 1 to 2 inches into the soil. For most foliage plants, water once that top layer feels dry; for succulents, cacti, snake plants, and ZZ plants, wait until the pot is dry nearly all the way down.

Lifting the pot also helps. A dry pot feels noticeably lighter, and after a few checks you can judge moisture by weight alone.

Use Room-Temperature Water

Cold tap water can shock roots, especially in tropical plants like calatheas and peace lilies. Fill a watering can and let it sit for a few hours so it reaches room temperature before you use it.

Water thoroughly until it runs from the drainage holes, then empty the saucer after 15 to 30 minutes. Standing water in a cool room keeps roots wet far too long.

Signs You Are Watering Too Much

• Lower leaves turn yellow and soft
• Soil smells sour or stays wet for more than a week
• Stems feel mushy at the soil line
• Tiny flies hover around the pot

Constantly damp soil also invites soil pests. If you see small wriggling larvae, this guide on white worms in house plant soil, what they are and how to get rid of them walks through identification and treatment.

Traveling Over the Holidays

Winter plants dry out slowly, so most can handle a week or more without water if you water thoroughly before you leave.

Lower the thermostat no further than about 60°F, and close curtains only if the plants will not need the light. For longer trips, here is how to care for houseplants while on vacation.

Sophia’s tip: Write the date of each watering on a strip of masking tape stuck to the pot. In winter, intervals stretch so much that memory becomes unreliable, and the tape shows you each plant’s real rhythm.

Where Should Houseplants Sit When Winter Light Is Weak?

Move plants closer to your brightest windows, usually south or west facing in the Northern Hemisphere, and supplement with a grow light if needed. Winter sun is lower and weaker, so spots that scorched plants in summer are often ideal now.

Window Direction in Winter

Window direction	Winter light	Good fits
South	Brightest, several hours of direct sun	Succulents, cacti, citrus, crotons, fiddle leaf figs
West	Bright afternoon sun	Rubber plants, jade, hoyas, monsteras
East	Gentle morning sun	Pothos, philodendrons, peace lilies, ferns
North	Dim, indirect only	Snake plants, ZZ plants, cast iron plants

Distance From the Glass

Light drops off quickly with distance. A plant 3 feet from a window may get a fraction of the light it would get on the sill, so moving plants a foot or two closer makes a real difference in winter.

Keep leaves a few inches from the glass itself, though. Foliage touching a cold pane can develop brown or translucent patches overnight.

Adding a Grow Light

If your plants stretch toward the window, drop leaves, or lose their variegation, they need more light than your windows provide.

Run an LED grow light 12 to 14 hours a day on a timer, positioned about 6 to 12 inches above the foliage for most LED panels or bulbs.

Clean leaves also matter. Dust blocks light, so wipe broad leaves with a damp cloth every few weeks.

Rotate Regularly

Give each pot a quarter turn every week or two. This keeps growth even and stops plants from leaning hard toward the window.

How Do You Protect Plants From Cold Drafts and Radiator Heat?

Keep most houseplants between 60 and 75°F, away from drafty doors, single-pane windows, heat vents, and radiators. Sudden temperature swings stress plants more than a steady temperature that is slightly cool.

Cold Spots to Watch

• Windowsills on freezing nights, especially behind closed curtains
• Floors near exterior doors that open often
• Rooms you keep unheated, like sunporches
• Spots beside leaky window frames

Closing curtains at night traps plants between the fabric and cold glass. Either move them into the room at night or leave the curtains open behind them.

Heat Sources That Cause Damage

Radiators, baseboard heaters, and forced-air vents blow hot, extremely dry air. A plant right above or beside one can dry out in a day and develop crispy brown leaf edges.

Keep plants at least 2 to 3 feet from active heat sources.

If a radiator sits under your best window, a sturdy shelf or plant stand that lifts pots above and slightly forward of it can work, as long as hot air is not rising directly through the leaves.

How Cold Is Too Cold?

Plant group	Comfortable range	Damage risk begins
Tropical foliage (calathea, croton, alocasia)	65 to 80°F	Below 55 to 60°F
Common foliage (pothos, philodendron, monstera)	60 to 80°F	Below 50°F
Tough foliage (snake plant, ZZ, cast iron plant)	55 to 80°F	Below 45 to 50°F
Succulents and cacti	50 to 75°F	Near freezing for most

Many cacti and succulents actually benefit from a cooler, drier winter rest, and some flower better afterward.

How Do You Raise Humidity for Houseplants in Winter?

A room humidifier is the most effective way to raise humidity, with grouping plants and pebble trays offering smaller local gains. Aim for 40 to 60 percent for most tropical plants, though many tough species tolerate lower levels.

What Works

A cool-mist humidifier running in the room where plants live can lift humidity substantially. Clean it regularly according to its instructions, since standing water in the tank can grow mold and bacteria.

Grouping plants together creates a slightly more humid pocket as they release moisture through their leaves. Bathrooms and kitchens are naturally more humid, so light-tolerant plants may do well there.

What Helps a Little

Pebble trays are shallow trays filled with pebbles and water, with the pot sitting above the waterline. They raise humidity only right around the plant, and the effect is modest, but they cost almost nothing.

Keep the water below the top of the pebbles so the pot never sits in it.

What Does Not Really Work

Misting raises humidity for only a few minutes before the water evaporates. Frequent misting of fuzzy-leaved plants like African violets can also leave spots or encourage fungal problems.

Plants That Need Humidity Most

Calatheas, ferns, fittonias, and alocasias show dry-air stress first through crispy edges and curling leaves. Snake plants, ZZ plants, pothos, and most succulents handle dry winter air with little complaint.

Sophia’s tip: Set your hygrometer right among your plants rather than across the room. Readings next to a radiator-side shelf can differ by 10 percent or more from readings near the center of the room.

Cold Damage and Plant Shock: Symptoms and Fixes

Cold damage shows up as dark, water-soaked, or translucent patches, wilting that does not improve after watering, and sudden leaf drop. Move the plant somewhere warm and stable, wait, and trim only what is clearly dead.

Common Symptoms

• Leaves that look glassy, limp, or darkened, often within a day of exposure
• Black or brown patches on leaves that touched the window
• Sudden yellowing and dropping of several leaves at once
• Mushy stems, which signal more serious damage

Leaf drop after a move can also be ordinary shock from a change in light and temperature. Ficus plants are well known for dropping leaves after being relocated.

How to Help a Cold-Damaged Plant

Move it to a spot that stays 65 to 75°F with bright, indirect light. Do not fertilize, and do not water unless the soil is actually dry, since stressed roots take up little moisture.

Wait a week or two before pruning. Damage can keep spreading slightly, and leaving some injured tissue in place gives you time to see which stems are still alive.

When to Trim

Cut away leaves that turn fully brown or mushy using clean scissors. If a stem is soft and collapsed down to the soil, the plant may still regrow from the roots, so keep it warm and lightly watered for a few weeks before deciding.

Bringing Plants Home in Cold Weather

New plants bought in winter can be damaged during the short walk to the car. Wrap them in a paper sleeve or bag, keep the trip brief, and never leave them in a cold car.

Should You Fertilize or Repot Houseplants in Winter?

For most houseplants, stop fertilizing from late fall until new growth appears in late winter or spring, and hold off on repotting unless there is an emergency. Plants growing slowly cannot use extra nutrients, and salts build up in the soil.

Fertilizing

Excess fertilizer in winter can burn roots and leave a white crust on the soil surface. If a plant sits under strong grow lights and keeps actively growing, a diluted feeding at a quarter to half strength once a month is reasonable.

Resume normal feeding when you see fresh leaves in spring. That shift usually lines up with the routine you would use to care for houseplants in summer.

Repotting

Roots recover slowly in winter, so repotting now can leave a plant sitting in excess wet soil. Wait until early spring unless you see root rot, a cracked pot, or roots so crowded that water runs straight through.

If you must repot, go up only 1 to 2 inches in pot diameter and use a fresh, well-draining mix.

Pruning

Light pruning of dead or yellow leaves is fine any time. Save heavy shaping cuts for spring, when the plant can push out new growth quickly.

Plants That Bloom in Winter

Holiday cacti, amaryllis, and cyclamen are actively growing or flowering in winter. These plants are the exception, and they can be watered and fed lightly while in bloom.

Winter Pests and Pet Safety: What to Watch For

Spider mites, fungus gnats, mealybugs, and scale are the most common winter pests, thriving in dry air and damp soil. Check leaf undersides every week or two and treat early with targeted indoor methods.

Spider Mites in Dry Air

Spider mites love warm, dry rooms. Look for fine webbing, speckled or dull leaves, and tiny moving dots on the underside of foliage.

Rinse the plant in the shower, wipe leaves, raise humidity, and treat with insecticidal soap or horticultural oil according to label directions. Repeat treatments every 5 to 7 days for a few weeks to catch new hatchlings.

Fungus Gnats and Soil Pests

Small black flies around pots usually mean the soil stays too wet. Let the top inch or two dry fully, use yellow sticky traps to catch adults, and water less often.

Mealybugs and Scale

Mealybugs look like small cottony clumps in leaf joints. Scale shows up as small brown bumps on stems and leaf veins. Dab both with a cotton swab dipped in rubbing alcohol, then follow up with insecticidal soap.

Treatments to Avoid Indoors

Garden dusts and broad outdoor insecticides do not belong in a heated living room. Here is why I would use Sevin dust on houseplants? Why I’d skip it indoors explains the risks for people and pets.

Isolate any infested plant from the others until it is clean for several weeks.

Pet Safety During Winter

Pets often spend more time indoors and near plants in winter. According to the ASPCA, spider plants, Boston ferns, calatheas, and Christmas cactus are non-toxic to cats and dogs, while pothos, peace lilies, snake plants, and ZZ plants are toxic.

Poinsettias are listed as toxic by the ASPCA but typically cause only mild mouth and stomach irritation. Keep toxic plants on high shelves or in rooms pets cannot reach.

Sophia’s tip: When you move plants closer to windows for winter, check that you have not put toxic species within reach of a cat’s favorite sunny sill. Winter rearranging is when pets most often find new plants.

If you are adding plants this season, a list of the best indoor plants to buy, picked by light, pets and effort, can help you choose species that handle dim, dry months well.

Your Next Steps

• Check soil moisture on every plant before watering this week, and stretch the interval for any that still feel damp.
• Move light-loving plants to your south or west windows, keeping leaves a few inches from the glass.
• Pull plants at least 2 to 3 feet away from radiators, heat vents, and drafty doors.
• Place a thermometer-hygrometer near your plants and add a humidifier if readings stay under 30 percent.
• Pause fertilizing until new spring growth appears, and postpone routine repotting.
• Inspect leaf undersides for spider mites and mealybugs every week or two.

Common Questions About How to Care for Houseplants in Winter