Table of Contents
- Introduction
- Understanding Your Begonia Type
- Transitioning Outdoor Begonias Indoors
- Winter Care for Active Growers
- Overwintering Tuberous Begonias
- Watering and Fertilizing During the Winter
- Spring Awakening
- Conclusion
- FAQ
Introduction
As the autumn air turns crisp and the days grow shorter, many gardeners feel a pang of sadness at the thought of leaving their vibrant begonias behind. These tropical beauties are the stars of the summer garden, offering lush foliage and brilliant blooms. The good news is that you do not have to say goodbye to your favorite plants when the temperature drops. Bringing your begonias indoors for the winter is a rewarding way to extend the gardening season and ensure your plants are ready to dazzle again next spring.
At Longfield Gardens, we want to help you keep that garden magic alive all year long. Whether you are caring for a flashy Rex begonia on your windowsill or tucking away Non-Stop begonias for a winter nap, the process is straightforward and enjoyable. This guide is designed for home gardeners who want to understand the different needs of various begonia types during the cold months. We will walk you through the simple steps to transition your plants from the garden to the living room or the storage shelf.
Successful indoor winter care depends on identifying which type of begonia you have and matching your care routine to its natural seasonal cycle. By following a few basic steps, you can enjoy beautiful greenery indoors and a head start on next year’s garden.
Understanding Your Begonia Type
The first step in successful winter care is knowing which type of begonia you are growing. Begonias are incredibly diverse, and their winter needs vary significantly depending on their growth habit. In the gardening world, we generally group them into four main categories based on their root systems and growth styles.
Cane-Stemmed Begonias
These are often called "Angel Wing" or "Dragon Wing" begonias because of their elongated, wing-shaped leaves. You can identify them by their upright, woody stems that have swollen joints, much like a stalk of bamboo. Varieties like the 'Dragon Wing' are popular for their vigor and pendulous clusters of flowers. These begonias are evergreen and do not go dormant in the winter. They are happy to live as houseplants in a bright room.
Rhizomatous Begonias
This group is prized more for its foliage than its flowers. You can identify a rhizomatous begonia by looking at the base of the plant. You will see thick, fleshy stems called rhizomes that creep along the surface of the soil. These rhizomes store food and water for the plant. These begonias stay green throughout the winter and make excellent low-light houseplants.
Rex Begonias
Rex begonias are a specific type of rhizomatous begonia known for their "electrifying" foliage. Their leaves come in a stunning array of swirls, spots, and metallic colors ranging from silver and pink to deep purple. While they are slightly more sensitive to humidity than other types, they remain active growers throughout the winter and do not require a dormancy period.
Tuberous Begonias
These begonias, including the popular 'Non-Stop' and 'Illumination' series, grow from a round, potato-like tuber. They are famous for their large, rose-like flowers and beautiful mounding habit. Unlike the other types, tuberous begonias require a period of rest. In the winter, they naturally want to go dormant. Trying to keep them growing actively indoors all winter can stress the plant, so it is best to let them sleep.
Key Takeaway: Identify your begonia type first. Cane, Rex, and Rhizomatous types stay green all winter, while Tuberous types need a period of dormancy.
Transitioning Outdoor Begonias Indoors
Moving a plant from the great outdoors to the controlled environment of your home is a big change. To ensure your begonias stay healthy, the transition should be gradual. Sudden changes in light, temperature, and humidity can cause a plant to drop its leaves. While leaf drop is often a temporary response to stress, we can minimize it with a little planning.
The Timing of the Move
The best time to bring begonias indoors is before the first frost. Most begonias are tropical plants that prefer temperatures above 50°F. When the night temperatures consistently dip into the low 50s, it is time to start the moving process. If you wait until a frost is imminent, the plant may already be under significant cold stress.
A Gradual Acclimation
Instead of moving your plants directly from a shady garden spot to a heated living room, try a 7-day acclimation schedule.
- Days 1–2: Bring the plants into a porch or a garage overnight and move them back outside during the day.
- Days 3–4: Keep the plants in a sheltered porch or entryway full-time.
- Days 5–7: Move the plants to their final indoor location, ideally a room that is slightly cooler than the rest of the house.
This slow move allows the plant’s "breathing" pores on its leaves to adjust to the drier, lower-light conditions inside.
Checking for Pests
Before your begonias settle into their winter home, give them a thorough inspection. Check the undersides of the leaves and the stems for small insects like aphids or spider mites. A quick rinse with a gentle spray of water from the garden hose can knock off most hitchhikers. You can also wipe the leaves with a damp cloth. This simple step keeps your indoor garden healthy and prevents pests from spreading to your other houseplants.
What to Do Next
- Monitor local weather forecasts for night temperatures below 55°F.
- Clear a space near a bright window for your incoming plants.
- Inspect each pot for any signs of garden pests or debris.
- Begin the gradual move-in process over one week.
- Trim away any yellowing or damaged leaves to help the plant focus its energy.
Winter Care for Active Growers
If you are keeping Cane, Rex, or Rhizomatous begonias as houseplants, your goal is to maintain their health until they can go back outside in the spring. During the winter, these plants enter a slower growth phase. They aren't sleeping, but they aren't pushing out new growth as fast as they do in July.
Finding the Right Light
Indoors, begonias need bright, indirect light. An east-facing or west-facing window is usually the best spot. While they love the sun, direct midday sunlight through a window can sometimes be too intense and may scorch the leaves. If you notice the leaves looking pale or "bleached," the light might be too strong. Conversely, if the stems become long and "leggy" (stretching toward the light), the plant needs a brighter location.
Temperature and Comfort
Begonias thrive in temperatures that humans find comfortable, typically between 60°F and 75°F. Keep them away from cold drafts near doors or windows, and avoid placing them directly in front of heating vents. The hot, dry air from a furnace can dry out the foliage very quickly.
Managing Humidity
One of the biggest challenges for growing begonias indoors during winter is the dry air. Central heating significantly reduces indoor humidity. Rex begonias, in particular, will show their displeasure with brown, crispy edges on their leaves if the air is too dry.
A simple and effective solution is a pebble tray. Fill a shallow tray with small stones or pebbles and add water until it is just below the top of the stones. Place your begonia pot on top of the stones, making sure the bottom of the pot does not touch the water. As the water evaporates, it creates a small zone of higher humidity right around the plant. This is much more effective than misting the leaves, which can actually encourage fungal issues like powdery mildew.
Key Takeaway: For begonias that stay green, focus on bright indirect light and increased humidity via pebble trays to prevent crispy leaf edges.
Overwintering Tuberous Begonias
Tuberous begonias, such as the 'Non-Stop' varieties we offer at Longfield Gardens, require a different strategy. These plants use the winter to rest and recharge their energy in their tubers. Trying to keep them blooming all winter usually results in a weak, spindly plant. Instead, we follow the dormancy method.
Initiating Dormancy
In late autumn, you will notice your tuberous begonias beginning to look a bit tired. The leaves may yellow, and the flower production will slow down. This is your cue to stop fertilizing and reduce watering. Allow the soil to dry out significantly. If the plants are in the ground, wait until the first light frost kills the top growth. The frost sends a signal to the plant to move all its nutrients down into the tuber.
Lifting and Cleaning
Once the stems have turned yellow or have been hit by a light frost, cut the stems back to about one inch above the soil. Carefully lift the tubers out of the soil using a garden fork or trowel. Be gentle to avoid nicking or bruising the fleshy tuber.
Brush off the excess soil and let the tubers sit in a warm, dry, frost-free place for about a week. This "curing" process allows the outer skin to toughen up and any remaining stem bits to dry up and fall off naturally.
Storage Conditions
Once cured, store the tubers in a way that prevents them from drying out completely but also prevents rot. The best method is to place them in a box filled with dry peat moss, vermiculite, or sawdust. Store the box in a cool, dark, and dry place where temperatures stay between 45°F and 55°F. A cool basement or an insulated crawl space is often ideal.
Check your tubers once a month during the winter. If they look shriveled, you can lightly mist the packing material with a tiny bit of water. If you see any soft spots or signs of rot, remove that tuber immediately so it doesn't affect the others.
Watering and Fertilizing During the Winter
Whether your begonias are growing in the window or resting in the cellar, their "dietary" needs change in the winter. Overwatering is the most common cause of trouble during the indoor months.
The "Deep then Dry" Rule
For begonias that remain active houseplants, water them thoroughly until water runs out of the drainage holes, then wait until the top inch of soil feels dry to the touch before watering again. In the winter, the soil takes much longer to dry out because the plant is not growing as fast and there is less intense sunlight.
Avoid the temptation to give them a little water every day. This keeps the roots too wet and can lead to root rot. If the soil stays soggy, the roots cannot "breathe," and the plant will eventually suffer. Drainage is simply how fast water leaves the soil; always ensure your pots have holes in the bottom to let excess water escape.
Skip the Fertilizer
Most begonias do not need fertilizer during the winter. Since they are in a resting or slow-growth phase, adding nutrients can lead to weak, thin growth that is more susceptible to pests. Wait until you see vigorous new growth in the spring—usually around March or April—to resume a regular feeding schedule. When you do start again, use a balanced water-soluble fertilizer at half the recommended strength to gently wake the plants up.
What to Do Next
- Use your finger to check the soil moisture before every watering.
- Empty any water that collects in the saucer under the pot.
- Put your fertilizer away in a storage shed or closet until spring.
- Rotate your plants a quarter turn every week so they grow evenly toward the light.
Spring Awakening
As the days grow longer in late February and March, you will notice your indoor begonias starting to perk up. This is an exciting time! For your houseplants, you can begin to increase the amount of water slightly and perhaps move them to an even brighter spot.
For your dormant tuberous begonias, it is time to wake them from their winter nap. Around 8 to 12 weeks before the last expected frost in your area, bring the tubers out of storage. Look for small pink or white "eyes" or buds starting to form on the concave (hollow) side of the tuber.
Starting Tubers Indoors
Place the tubers in a shallow tray filled with moist potting soil. Position the tubers with the hollow side facing up. Do not bury them deep; the top of the tuber should be just level with the soil surface. Place the tray in a warm, bright spot (about 70°F). Water sparingly at first—just enough to keep the soil from being bone dry. Once you see green shoots emerging, you can begin to water more regularly and provide more light.
Starting your begonias indoors gives them a massive advantage. By the time the weather is warm enough to move them back into the garden, you will have established plants ready to bloom much sooner than if you had waited to plant the tubers directly in the ground.
Conclusion
Growing begonias indoors through the winter is a wonderful way to preserve your favorite varieties and enjoy the greenery of the garden all year long. Whether you are tending to the brilliant leaves of a Rex begonia or carefully storing 'Non-Stop' tubers for the next season, the process is all about working with the plant's natural rhythm. By providing the right light, managing humidity, and being mindful of your watering can, you can ensure a successful winter for your plants.
At Longfield Gardens, we take pride in providing high-quality bulbs and perennials that help your garden thrive. We stand behind our plants with a 100% quality guarantee, ensuring that what you plant is true to variety and arrives in prime condition. If you ever have questions about your plants' performance during their first growing season, our team is here to support you with practical advice and solutions.
As you look forward to the coming spring, remember that the care you provide now is the foundation for a spectacular garden later. Gardening is a journey of patience and observation, and the reward of seeing those first spring sprouts is always worth the wait.
"Winter is a time of rest for the garden and a time of preparation for the gardener. Caring for begonias indoors keeps us connected to the soil until the sun returns."
Key Takeaways for Winter Begonia Care:
- Identify if your plant is an active grower (Cane, Rex, Rhizomatous) or a dormant type (Tuberous).
- Acclimate outdoor plants to the indoors over a week to prevent leaf drop.
- Use pebble trays to provide the humidity begonias crave in dry winter air.
- Store tuberous begonias in a cool, dark, dry place in peat moss or vermiculite.
- Wait until spring growth appears before resuming fertilization.
We look forward to seeing your gardens bloom! For more planning guides and gardening tips, feel free to explore our other resources. Happy indoor gardening!
FAQ
Can I keep my tuberous begonias growing as houseplants all winter?
While it is technically possible, it is not recommended for the long-term health of the plant. Tuberous begonias naturally want to enter a period of dormancy to recharge their energy for the next blooming cycle. If forced to grow year-round, they often become weak and prone to disease. It is much better to let them rest in a cool, dark place for the winter months.
Why are the leaves falling off my begonia now that I brought it inside?
This is a very common reaction to a change in environment. The air inside our homes is usually much drier and the light is less intense than it is outdoors. This causes the plant to drop its "outdoor" leaves so it can grow new ones that are better adapted to indoor conditions. As long as the stems remain firm and you provide bright indirect light, new leaves should appear soon.
Do I need to use a grow light for my begonias in the winter?
It depends on the natural light available in your home. If you have a bright east- or west-facing window, your begonias will likely be fine. However, if your home is quite dark, a simple LED grow light can help keep the plants compact and healthy. Keep the light on for about 12 to 14 hours a day to mimic the longer days of the growing season.
How often should I water my dormant begonia tubers in storage?
You should actually avoid watering dormant tubers. The goal of storage is to keep them dry enough to prevent rot but protected enough so they don't turn into hard, shriveled pebbles. If the peat moss or vermiculite feels completely bone dry and the tubers look a bit wrinkled, you can very lightly mist the packing material once a month. Never let the tubers sit in wet material, as they will rot quickly.