Water houseplants less often in winter, and only when the compost a few centimetres down has dried. In a cool room, the gap between waterings often stretches to around one and a half to two times the summer interval. A pot beside a radiator can dry faster than you expect, though, so check the compost rather than the calendar.
That is the short answer. The longer one matters, because winter is when most houseplant overwatering happens. The plant slows down, the weekly habit does not, and compost that used to dry out in four days now stays wet for ten. Below is why that happens, what to expect plant by plant, and how a heated UK home changes the picture.
Why do houseplants need less water in winter?
Because they are growing less. With lower light and cooler rooms, a plant makes less new growth and loses less water through its leaves, so it draws less from the compost. The RHS puts it plainly: with lower light levels and lower temperatures, plants grow less, so they need less water.
Light is the bigger factor than most people expect. Around the shortest day, London gets under eight hours of daylight, and further north gets less, and much of that light is weak and low. A plant a couple of metres back from a window in December is getting a small fraction of what it got in June. It is not dormant in the way an oak tree is, but it is running at a much slower pace, and its water use slows with it.
The compost changes too. Cooler air means slower evaporation from the surface, so the same pot simply stays wet for longer. Put those together and a plant that wanted water every week in July may be perfectly happy going much longer in January.
How often should you water houseplants in winter?
There is no fixed number of days, but there is a reliable pattern: the same check as summer, with longer gaps between the moments it says yes. The table below covers the common groups, with the exceptions that catch people out.
| Plant group | Winter watering | Worth knowing |
|---|---|---|
| Most leafy houseplants (pothos, monstera, peace lily, spider plant) | When the top few centimetres of compost are dry. Expect longer gaps than summer. | Water thoroughly when you do, then let it drain. Smaller, more frequent sips keep the surface wet and the roots dry. |
| Cacti and most succulents | Minimal or none, roughly November to early March | The RHS suggests cool nights of 8–10°C (46–50°F) and only enough water to stop them shrivelling. |
| Snake plant (sansevieria) | Barely any | The RHS says they barely need water in winter unless they are somewhere particularly warm. |
| Christmas cactus (schlumbergera) | Regularly. This one is the exception. | It flowers in winter and wants warmth and regular watering then, with its rest in summer. |
| Moth orchids (phalaenopsis) | Slightly less than summer | The RHS advises never letting the roots dry out completely, and never leaving them sitting in water. Tepid water, ideally rainwater. |
| Ferns, calatheas, marantas | Less often, but do not let them dry out completely | Dry air is their bigger winter problem. A wide tray of wet pebbles helps. |
If you want a rough starting point for your own plants, take the summer interval and expect it to stretch by about half again, sometimes double, in a cool room. Then let the compost decide. The point of the rule of thumb is to stop you watering on autopilot, not to replace the check.
What changes in a heated UK home?
Central heating pulls in the opposite direction to the season, which is why winter watering confuses so many people. A cool spare bedroom and a warm living room can need completely different routines for the same plant.
- Radiators dry pots out. The RHS notes that pots dry out faster in winter when central heating lowers the humidity, and that being too near radiators or fires can crisp delicate leaves. A plant on a shelf above a radiator may need water more often than the same plant across the room.
- Cool rooms slow everything down. In the RHS's words, plants in a cool room will need watering less often than plants in a warm room. An unheated room or a porch can stretch the interval a long way.
- Windowsills get cold at night. The RHS warns that being left in the cold on windowsills and behind curtains can damage some plants. If you close the curtains on a frosty night, bring tender plants into the room side.
- Draughts matter. A plant by a door that opens onto a cold hall gets repeated chills, which looks a lot like a watering problem and is not.
- Dry air hits thin leaves first. Ferns, calatheas, marantas and orchids appreciate a wide tray of pebbles topped up with water, and grouping plants together helps them share humidity.
The practical upshot: judge each plant by where it actually sits, not by what kind of plant it is.
How do you tell when a houseplant needs water in winter?
The same way as in summer, only more patiently. Feel the compost, lift the pot, and look at the plant, in that order.
- Push a finger a few centimetres into the compost. The surface dries first and is a poor guide. If it is still damp below the surface, wait.
- Lift the pot. The RHS notes that drier pots feel lighter than wet ones. Weigh it in your hand straight after a thorough watering once, and you will have a reference for that pot all winter.
- Look at the plant. Succulents soften and wrinkle slightly when they genuinely need water. Leafy plants droop. But do not water a drooping plant without checking the compost first: in winter, a droop in wet compost is far more often too much water than too little.
Cheap moisture meters can help as a second opinion, but they are easily fooled by salts in the compost. The overwatering vs underwatering guide goes into why, along with a one-minute test for a plant that already looks unhappy.
How should you water houseplants in winter?
Less often, not less thoroughly. When the check says yes, water properly and then get rid of the excess.
- Water until it runs from the drainage hole, then empty the saucer. If the plant sits in a decorative outer pot, the RHS suggests checking about ten minutes later and tipping away what has collected. Standing water in winter is how a healthy plant ends up with rotten roots.
- Use water at room temperature. The RHS warns that cold water can harm plants, which matters in winter when the cold tap is genuinely cold. Leaving tap water to stand for about 24 hours also lets chlorine disperse.
- Use rainwater for acid-loving plants if your tap water is hard, but bring it indoors to warm up first.
- Feed little or not at all. The RHS suggests limiting winter feeding to once a month at most, because light levels are too low for the plant to use it. Never feed dry compost; water first.
- Move plants towards the light. Bringing plants out of dark corners for a stint somewhere brighter is one of the RHS's own winter suggestions. More light means more growth, which means the water you give gets used.
What are the signs of winter overwatering?
Soft yellowing on old and new leaves together, compost that stays damp for a week or more, small dark flies around the pot, and a plant that wilts while the compost is wet. Fungus gnats in particular are a report on how wet the compost has been, which is one of the ways plants tell you about a problem weeks after it started.
If you see these, stop watering, empty anything the pot is standing in, and let the compost dry. If yellowing is the main symptom, the yellow-leaves walkthrough helps separate water from light and nutrients. And if you would rather start from a picture, here is how to identify plant problems from a photo.
Where does Mali help with winter watering?
Mali gives each plant its own watering rhythm rather than one schedule for everything. The interval starts from what that plant needs and is adjusted for whether it is indoors or out, in a pot, and how much sun it gets.
When the cold season arrives, which Mali works out from the typical temperatures where you live, watering reminders switch to a winter pace. For indoor plants, the interval stretches by about half again, so a plant on a six-day rhythm moves to roughly nine. Outdoor plants stretch further and are also adjusted for your local weather, including pushing a reminder back when heavy rain is forecast. Seed trays are left alone, because seedlings still need steady moisture.
The reminder is still an estimate, and Mali cannot see your radiator. That is why a photo check-in is the better habit: Sidney, Mali's AI plant expert, reads the photo along with when the plant was last watered, and tells you if it is not thirsty. Mali is free to use, with an optional Mali+ subscription that lifts the limits on the AI features. It is on iOS and Android, and the home page shows the rest of what it does.
Sidney, our resident purple snail, spends winter sealed in her shell and considers this the correct response to the season. She would like your succulents to take the same approach and stop being offered drinks.
FAQ
Should I water houseplants less in winter?
Yes, for nearly all of them. Lower light and cooler rooms slow growth, so plants use less water and compost dries more slowly. Keep checking the compost a few centimetres down, and water only when it has dried. Christmas cactus is the common exception, since it grows and flowers in winter.
How long can houseplants go without water in winter?
Longer than in summer. The RHS says that in winter houseplants can be left for a week or two without water as long as the room is cool. Move them away from radiators and sunny windows before you go, water thoroughly, and let them drain fully so nothing is left standing in water.
Should I feed houseplants in winter?
Very little, if at all. The RHS suggests no more than once a month in winter, because low light means the plant cannot make much use of the feed. Most houseplants are better left unfed until growth picks up in spring.
Is cold tap water bad for houseplants?
It can be. The RHS advises using water at room temperature, and in winter the cold tap can be very cold. Fill a jug and leave it to stand, ideally for about 24 hours, which also lets chlorine disperse.
Why are my houseplant's leaf tips going brown in winter?
Usually dry air or heat. Central heating lowers humidity, and the RHS notes that plants too near radiators can have their leaves crisp and brown at the edges. Brown edges can also mean underwatering, so check the compost before you move the plant or change anything else.
Keep reading: how to protect plants from frost, how to identify plant problems from a photo, or browse all posts.
— Akhil Madan, founder of Keeda Studios. I once set a weekly watering reminder. It was wrong most of the year, and January was where it showed most.