How To Prepare Your Indoor Plants for Winter ❄️

As the days get shorter and darker and the air gets a little crisper, our houseplants start to feel the changes as much as we do. For those of us who are plant enthusiasts, winter can bring a bit of anxiety: how do we keep our green friends happy and healthy when sunlight is scarce and the air indoors turns dry and toasty? 🤔

The good news is that preparing your houseplants for winter doesn't have to be complicated. With a few adjustments, you can keep them thriving through the colder months. 

Understanding Overwintering vs. Dormancy

Before diving into specific care tips, let’s talk about two natural winter responses your plants might experience: overwintering and dormancy. Knowing the difference can help you give your green friends the right care during these colder months.

Overwintering

Overwintering usually applies to outdoor plants—like herbs, certain veggies, or tender perennials—that you bring inside to keep safe from the frost. These plants are used to more sunlight and fresh air, so they might need a little extra support indoors to stay cosy. They’ll still need some sunlight, water, and humidity, though less than they did outdoors. Think of it as giving them a warm, temporary “home away from home” until they can thrive outside again in the spring.

Dormancy

Dormancy, on the other hand, is like a winter nap for indoor plants. Many common houseplants—like ficus, rubber trees, and snake plants—enter a natural resting phase during the winter, slowing down their growth and sometimes shedding a few leaves to conserve energy. For these plants, less is definitely more. They’ll need less water and no fertiliser while they “hibernate” and save up energy for the growing season ahead.

With this quick background on overwintering and dormancy, let’s jump into specific ways to help all your plants thrive through winter!

 

9 expert tips to winter-proof your indoor plants

 

1. Find the light 💡

When sunlight is limited, your plants will need every bit of it they can get. Even if your plants have been happy in their current spots all summer, winter’s low light levels can make them struggle. Here’s how to give them the best light possible during these darker months:

• Move plants closer to light sources: Start by positioning your plants closer to well-lit areas, like windows, but be cautious with soft-leaved varieties. These plants are more sensitive to cold drafts, so avoid placing them too close to open windows or spots where chilly air might seep through. Dropping a few leaves is normal in winter, but if you notice too many, it might indicate that your plant is feeling the chill.
• Rotate for even growth: Most plants instinctively stretch toward the light, and they’ll reach even more in winter. You’ll ensure that each side gets equal exposure by rotating your plants every week or two. This way, your plant will grow evenly, and you won’t have a “leaning” plant!
• Consider a grow light: If your home doesn’t get enough natural light during winter, consider using a grow light. Modern grow bulbs are game-changers; they’re far more subtle than the bulky, industrial versions of the past and can even fit into your standard fixtures. You can give your plants the light they need with a good grow light without disrupting your decor.

2. Clean windows and leaves 🌿

It’s not just about getting more light—it’s also about maximising what’s available. Dust and grime on windows and leaves can significantly reduce the amount of sunlight that reaches your plants. Here’s a quick checklist to keep things squeaky clean:

• Clean your windows: Dusty windows block out precious sunlight, so take some time to clean your windows thoroughly. It may seem small, but the difference in light absorption for your plants can be surprisingly significant.
• Wipe down leaves: Dust can also accumulate on leaves, making it harder for them to absorb sunlight effectively. Use a damp, soft cloth to wipe down each leaf gently. It’s also a good opportunity to inspect your plants for any pests or issues. Clean leaves look better and are better equipped to handle the limited light.

 

3. Adjust your watering routine 💦

One of the biggest mistakes plant owners make in winter is watering their plants as frequently as in summer. However, plants need far less water in winter due to decreased sunlight, which means less photosynthesis and slower growth.

• Lower the watering frequency: Your plant’s water needs will drop significantly in winter, so reduce the frequency and amount of water. Even if the soil seems drier due to radiator heat, overwatering can lead to root rot, which is far more problematic. Feel the soil before watering; if it’s still moist an inch or so down, hold off.
• Adjust based on each plant’s needs: Every plant has its own “personality” when it comes to watering, and winter is a great time to tune into each plant’s preferences. Plants like cacti and succulents need very little water in winter, while tropical plants might require a bit more but still less than usual. A moisture meter can be a handy tool to prevent overwatering.

 

4. Monitor humidity levels 🥵

Radiators and heaters can make indoor air dry, which is tough on houseplants—especially tropical varieties that are used to high humidity. There are a few tricks to help them feel a bit more at home:

• Group plants together: Placing plants in clusters can create a mini-ecosystem where they naturally help each other retain humidity. This little “community” can combat the drying effects of indoor heat, which can damage leaves and lead to brown edges.
• Mist leaves regularly: Lightly misting leaves can help increase humidity. Be careful not to overdo it, as excessive moisture can lead to mould. A quick spray every few days, especially for plants like ferns, calatheas, or prayer plants, can keep them happy without risking rot.
• Use a humidifier: Investing in a small humidifier can make a noticeable difference for those seriously committed to their plants' wellbeing. Placed near your plants, it can help them weather the dry winter air.

 

5. Keep temperatures consistent 🌡️

Many houseplants are sensitive to sudden temperature fluctuations, so winter can be challenging when cold drafts and radiator blasts alternate throughout the day. 

• Avoid drafty areas: Place plants away from drafty doors and windows, where the temperature can drop quickly. Some plants can tolerate a bit of cold, but for most, consistent warmth is key to keeping them comfortable.
• Be mindful of radiators: It’s tempting to put plants near radiators or heaters to keep them warm, but direct exposure can scorch leaves and dry out the soil too quickly. If you must place plants near a heat source, keep them a foot or two away to prevent direct heat damage.

 

6. Keep an eye on pests 👀

Winter is prime time for pests to make an appearance. Spider mites, in particular, thrive in dry indoor environments and can quickly become a problem if left unchecked.

• Inspect plants regularly: Take a few moments each week to check your plants’ leaves, especially the undersides, for any signs of pests like spider mites or aphids. Catching these early can prevent a full-blown infestation.
• Treat mild infestations fast: If you spot pests, treat the affected areas immediately with a gentle insecticidal soap or a solution of water and mild dish soap. Neem oil can also be an effective, plant-friendly remedy.

 

7. Be patient with growth 🧘

Winter isn’t the time for rapid plant growth. In fact, many plants will go dormant, which is perfectly natural. During this period, they’re conserving energy and don’t need as much attention.

• Embrace a slower growth phase: Your plants will likely grow slower in winter, and that’s okay. Resist the urge to over-fertilise to speed things up, as this can stress the plant and lead to salt buildup in the soil.
• Appreciate their resting phase: Think of winter as a time when your plants are “recharging” for the burst of growth that comes in spring. A little patience and gentle care now will pay off when the days lengthen.

 

8. Refresh the soil surface 🤎

Winter is a great time to inspect and refresh the top layer of your plant’s soil, which can accumulate dust, mineral salts, or pests over time.

• Remove the top inch of soil: Gently scoop out the top inch of soil and replace it with fresh potting mix. This can help remove any lingering salts or debris and give the plant a fresh start without disturbing the roots.
• Check for drainage issues: While refreshing the soil, ensure drainage is still working properly. Good drainage is crucial during winter to avoid waterlogging, which can lead to root rot. If water sits on top too long, you may need to repot in a better-draining soil mix or inspect the drainage holes.

10. Plan for spring repotting 📝

While winter is a rest period, it’s also the perfect time to make a mental checklist of plants that may need repotting come spring. Repotting is typically best done in early spring when plants are ready to grow again, but now’s a great time to prepare for it.

• Identify cramped roots: If you see roots peeking out from the drainage holes or on the soil surface, make a note to repot that plant when warmer months arrive.
• Get supplies early: Stocking up on potting soil, new pots, and tools in winter can save you the rush in spring and ensure you’re ready for a smooth repotting process.

Winter might make plant care feel tricky, but it’s also a chance to get to know what your plants really need. With a few small tweaks to their surroundings, a little change-up in your routine, and some extra TLC, you’ll help them cruise through the colder months. After all, they work hard to keep our spaces lively even on the darkest days—returning the favour just feels right!