Winter is (almost) here – so it’s time to prepare your potted plants

Are you ready for ice-cold wind, snow, and frost? What about your plants? It seems like summer passed in a blink, and if you love gardening, you most likely worry about your plants because they don’t love the cold season. Most plants (balcony, garden, and even indoor) must be prepared for when the temperatures drop. But when should you start? Depending on your location, a drop in temperature could indicate that you need to focus on preparing the plants for the colder months. During autumn, the temperature might be warm during the day, but at night, it drops, and your plants might not handle the shock very well. 

While some plants can withstand winter, many are sensitive, and you need to move them indoors before the first frost. If you lack knowledge about how to prepare your potted plants for winter, this guide should help. 

Assess the Plants’ Needs

Before winter sets in, it’s essential to understand the specific needs of each of your potted plants because some can withstand cold temperatures, while others are sensitive to frost and need special care. Start by dividing your plants into two categories:

• Cold-hardy plants: These plants can tolerate cooler temperatures and may be left outside with minimal protection. Examples include pansies, evergreen shrubs, and some herbs like rosemary.
• Frost-sensitive plants: These plants need to be brought indoors or provided with significant protection, such as tropical plants (e.g., ferns, palms), succulents, and houseplants.

Move Plants Indoors

Moving frost-sensitive plants indoors is often the best way to protect them from harsh winter conditions. However, this transition needs to be done thoughtfully to avoid shock and ensure the plants adjust to their new environment. Don’t wait for the first frost to bring plants inside. Once nighttime temperatures start consistently dropping below 50°F (10°C), it’s time to move them indoors to give them a gradual acclimatization period. Sudden changes in light and humidity can shock plants so move them into a covered porch or garage for a few days before bringing them fully inside. This gradual shift helps them adjust to the lower light levels indoors. Before getting any plants inside, thoroughly inspect them for pests such as aphids, spider mites, or scale. Remove any visible insects, and if needed, treat the plant with a mild insecticidal soap to avoid bringing pests indoors.

Gently wash the outside of the  pots to remove any dirt, debris, or insects hiding in crevices and maintain indoor cleanliness. 

Adjust Light Levels

Indoor conditions during winter are often darker and less sunny than outdoors. To help plants thrive inside, make sure they have adequate light, so place potted plants near south-facing windows where they can receive the most sunlight during the shortened daylight hours. For plants that need high levels of sunlight (such as succulents or citrus trees), consider supplementing natural light with grow lights to mimic the sun’s spectrum and help maintain the plant’s photosynthesis. Rotate your plants every few days to ensure all sides receive equal exposure to light, preventing uneven growth.

Control Temperature and Humidity

Indoor heating can drastically reduce humidity levels, which may stress plants, especially those that thrive in humid environments, such as ferns and tropical varieties. For most houseplants, try to keep indoor temperatures between 60°F and 70°F, and avoid placing plants near drafty windows, doors, or heating vents, as these areas can create temperature extremes.

To combat dry indoor air, you can mist plants regularly, place a humidifier near them, or group them to create a micro-humid environment. Another option is to place pots on trays filled with water and pebbles, ensuring the pots themselves are not sitting in the water.

Adjust Watering Routines

Watering needs change in the winter as plants generally grow slower and require less moisture. Overwatering is a common issue during winter as plants in cooler conditions or reduced light levels don’t need as much water because they’re not actively growing. Allow the top few inches of soil to dry out before watering again and make sure all pots have proper drainage to avoid waterlogging, which can lead to root rot. If pots don’t have drainage holes, be extra cautious about watering and consider repotting them into containers with adequate drainage. Use room-temperature water when watering plants because cold water can shock the roots and harm the plants, especially when adjusting to cooler weather.

Reduce Fertilization

Most potted plants go dormant or significantly slow their growth during the winter months; hence, they don’t need as much fertilizer. Stop fertilizing your plants by mid-fall, as their nutrient requirements decrease, and over-fertilizing during dormancy can result in unhealthy growth or nutrient burn. Once the weather starts to warm up and plants begin actively growing again, you can slowly reintroduce a fertilization routine to encourage robust growth.

Provide Outdoor Protection

Take measures to protect cold-hardy plants that remain outside during winter from frost, snow, and wind.

• Mulch: Add a thick layer of mulch around the base of outdoor potted plants to insulate the soil and keep the roots warm, especially for perennials.
• Wrap pots: For extra protection, wrap the pots in burlap, bubble wrap, or an old blanket to shield the root ball from freezing temperatures.
• Elevate pots: Keep pots off cold surfaces like concrete or stone, which can freeze during the winter. Elevating pots on bricks or pot feet prevents cold from seeping into the roots.
• Cluster plants together: Grouping outdoor plants closely together provides a shared microclimate, protecting them from wind and frost. 
• Cover plants: Cover outdoor plants with frost cloths or old sheets overnight if a hard freeze is expected. 

Prune and Clean Up

Pruning plants before winter can help prevent disease and encourage healthy growth in the spring. However, be mindful of the plant type and its needs. Remove any yellowing, dead, or damaged leaves and stems from your potted plants. This improves the plant’s appearance and prevents the spread of disease or pests.

• Hold off on heavy pruning: While light pruning is beneficial, avoid heavy pruning before winter, especially for plants that bloom on old wood, like hydrangeas or lilacs. Heavy pruning can stimulate new growth that may not survive the cold.
• Clean fallen debris: Regularly remove fallen leaves and plant debris from the pots and surrounding area to prevent mold and attract pests.

Repot if Necessary

If any of your greeneries have outgrown their plant pots, fall is an excellent time to repot them into slightly larger containers. Repotting should be done before bringing plants indoors or before freezing temperatures arrive as it stimulates root growth. Plants need a few weeks to adjust to their new homes before the stress of winter. Always use fresh, well-draining potting soil to give your plants a nutrient boost, and avoid garden soil, which may compact or retain too much water.

Monitor for Pests and Diseases

Finally, keep a close eye on your potted plants throughout winter. Reduced light, increased humidity, and indoor environments can make plants more susceptible to pests and diseases. Check your plants for signs of common pests like spider mites, mealybugs, or scale, and look for webbing, sticky residue, or discolored leaves.

By following these steps, you can successfully care for your potted plants and ensure they survive winter in good health. Each plant’s needs may vary, but attention to light, water, temperature, and protection will make the seasonal transition smoother.

See more of my plant-related posts here

Becky

Meet the award-nominated UK lifestyle blogger behind Spirited Puddle Jumper – a mum of three living in South East London! Becky shares the real ups and downs of family life, parenting tips, and lifestyle inspiration, proving that being a mum doesn’t mean you stop being fun or having other interests! Follow along for honest insights into UK family life and opinions on a whole range of topics, from travel and food, to beauty reviews, home and DIY, business and health and wellness.