Introduction
There is a unique kind of joy that comes from watching the lush, vibrant blooms of a begonia brighten up a shaded corner of your garden. Whether you love the massive, rose-like flowers of tuberous varieties or the electrifying, patterned foliage of Rex types, these plants are true showstoppers. As the autumn air turns crisp, you do not have to say goodbye to these beauties. With a few simple steps, you can help your plants survive the cold months and return even stronger next year.
At Longfield Gardens, we want to help you enjoy your garden all year long. Caring for begonias through the winter—a process often called overwintering—is a rewarding way to preserve your favorite varieties and save money on next year's planting. If you are starting from scratch, our Begonia Flower Bulbs for Sale collection is the best place to explore the full range. This guide will walk you through the two main ways to handle begonias: keeping them active as houseplants or helping them enter a healthy period of rest. By matching your care to the specific type of begonia you own, you can ensure a successful transition from the garden to the Great Indoors.
Identifying Your Begonia Type
Before you bring a single pot inside, it is important to know which "family" your begonia belongs to. Begonias are a diverse group, and they do not all handle winter the same way. Some prefer to stay green and growing all year, while others require a nap (dormancy) to recharge for the following spring. For a deeper overview of the main begonia groups, see our All About Begonias guide.
Tuberous Begonias
These are the superstars of the shade garden, known for large, spectacular flowers in shades of red, pink, yellow, and white. Popular series like Non-Stop, Illumination, and AmeriHybrid fall into this category. These plants grow from a thick, fleshy root called a tuber, which stores energy. Tuberous begonias are seasonal performers; they naturally want to go dormant in the winter.
Rex and Rhizomatous Begonias
Rex begonias are grown primarily for their incredible foliage. Their leaves can feature swirls of silver, purple, pink, and deep green. Rhizomatous begonias grow from a thick stem (the rhizome) that creeps along the soil surface. Both types can live happily as houseplants throughout the winter without needing a dormancy period.
Cane-Stemmed and Wax Begonias
Cane begonias, often called "Angel Wing" begonias, have tall, bamboo-like stems and clusters of drooping flowers. Wax begonias are the classic bedding plants with glossy, rounded leaves. Both of these are "fibrous-rooted" begonias. They are evergreen and can continue to grow and even bloom indoors if given enough light.
Key Takeaway: The first step to winter success is knowing if your plant needs a rest (tuberous) or wants to keep growing (Rex, Cane, and Wax).
Moving Plants Indoors: The Transition
The most successful indoor transition happens when you work with the weather rather than against it. Most begonias are tropical in origin and do not appreciate a sudden chill.
When to Make the Move
You should aim to bring your begonias inside before the nighttime temperatures consistently drop below 60°F. If you wait for the first frost, you may lose the foliage of your evergreen types, or the tubers of your flowering types could be damaged. A gradual transition is best. Move pots to a porch or a more sheltered area for a few days before bringing them into the house to help them adjust to lower light levels.
Preparing for the Indoors
Before bringing plants inside, give them a quick "spa day." Gently spray the leaves with water to remove dust and any lingering outdoor hitchhikers. Check the undersides of leaves and the stems for small insects. It is much easier to address these outdoors than in your living room. If the plant has grown very large, you can lightly trim back the stems of Cane or Wax begonias to make them more manageable for your indoor space.
Safety Note for Pet Owners
While begonias are beautiful, it is important to remember that they can be toxic to cats and dogs if eaten. The most toxic part is usually the underground portion (the tuber or rhizome). When placing your plants indoors for the winter, make sure they are on high shelves or in rooms that are inaccessible to curious pets.
Caring for Evergreen Begonias as Houseplants
If you are growing Rex, Cane, or Wax begonias, your goal for the winter is to keep them healthy and vibrant until spring. The indoor environment is different from the garden, so a few adjustments to your routine will go a long way.
Light Requirements
Indoors, light is much less intense than it is outside. Place your begonias in a spot that receives bright, filtered light. An east-facing window is often perfect, as it provides gentle morning sun. Avoid placing them in direct, harsh afternoon sunlight, which can scorch their leaves. If your home is naturally dark, you can use a simple LED grow light to provide the extra energy they need.
Watering Correctly
Watering is where many indoor gardeners run into trouble. In the winter, plants grow more slowly and need less water. The best rule is to wait until the top inch of soil feels dry to the touch. When you water, do so thoroughly until water runs out of the bottom of the pot, then empty the saucer. Never let your begonias sit in standing water, as this can lead to root rot—which is just a fancy way of saying the roots are drowning.
The Humidity Factor
Most homes become very dry once the heater starts running. Begonias, especially Rex varieties, love humidity. To keep them happy without making your house feel like a swamp, try these simple methods:
- The Pebble Tray: Fill a shallow tray with small stones and add water until it is just below the top of the stones. Set your pot on the stones. As the water evaporates, it creates a humid "micro-zone" around the plant.
- Grouping: Place several plants close together. As they naturally release moisture through their leaves, they create a more humid environment for each other.
- Avoid Misting: While it seems helpful, misting leaves directly can sometimes encourage fungal issues. The pebble tray is a much more effective long-term solution.
Temperature and Airflow
Begonias prefer temperatures between 65°F and 75°F. Keep them away from cold drafts near doors or windows, and away from direct heat sources like radiators or vent covers. Consistent temperatures help prevent leaf drop.
What to Do Next:
- Identify a bright, east-facing window for your indoor begonias.
- Set up a pebble tray to boost humidity before the heat comes on.
- Check soil moisture with your finger twice a week to avoid overwatering.
Overwintering Tuberous Begonias (Dormancy)
If you have tuberous begonias like the Non-Stop or Illumination series we provide, you will likely notice they start to look a bit tired in the fall. This is completely normal! These plants are designed to take a winter break. You can either keep them in their pots or dig up the tubers for storage. If you want a ready-made version of this type, our Non Stop Begonias collection is a useful reference.
Triggering Dormancy
As the days get shorter and cooler, reduce your watering. This tells the plant that it is time to start storing energy in the tuber. You will see the leaves begin to yellow and the stems may become a bit soft. Once the foliage has died back—or after the first very light frost has nipped the leaves—it is time to act.
Storing in Pots
If your begonias are in containers, the easiest method is to simply move the entire pot into a cool, dry, dark place, such as a basement or an attached garage. The temperature should stay between 45°F and 55°F. Do not water them at all during this time. The soil will dry out completely, and the tuber will sit safely inside until spring.
Digging and Storing Tubers
If your begonias are planted in the ground, or if you want to save space, you can dig up the tubers.
- Lift Carefully: Use a garden fork or a small spade to lift the tuber out of the ground. Be careful not to nick or cut the flesh.
- Clean and Dry: Gently shake off excess soil. Cut the stems back to about an inch above the tuber. Place the tubers in a warm, dry spot indoors for about a week to "cure" or dry out.
- Pack Them Up: Place the dry tubers in a cardboard box or paper bag. Surround them with a dry material like peat moss, vermiculite, or sawdust. This keeps them separated and prevents them from shriveling too much.
- Store: Keep the box in a cool (45–55°F), dark, and dry location. Check them once a month to make sure they are firm and not showing signs of rot.
Spring Awakening: Replanting and Moving Back Out
When the days begin to lengthen in late February or March, it is time to wake your begonias up. This is an exciting moment that marks the beginning of a new gardening season.
Starting Early Indoors
To get the most out of the blooming season, you can start your tuberous begonias indoors about 6–8 weeks before the last frost date. Place the tubers in a shallow tray of potting soil with the indented side facing up. Barely cover them with soil and give them a light drink of water. Place them in a warm, bright spot. Once you see sprouts, you can move them into their permanent pots.
Hardening Off
When the weather stays reliably above 60°F at night, you can begin moving your begonias back outside. This must be done gradually. Start by putting them in a shady, protected spot for a few hours a day, slowly increasing their time outside over a week or two. This "hardening off" period helps the leaves toughen up for the wind and outdoor light levels.
Key Takeaway: Patience is your best friend in spring. Waiting for the soil and air to truly warm up will lead to faster growth and more blooms than rushing them out into the cold.
Troubleshooting Common Winter Issues
Even with the best care, you might see your begonias react to the change in environment. Leading with the right approach helps you solve these quickly.
Leaf Drop
If you bring an evergreen begonia inside and it immediately drops several leaves, don't panic. This is often just a reaction to the lower light levels. The plant is shedding leaves it can no longer support so it can grow new ones that are better adapted to indoor light. Keep providing bright, indirect light, and you should see new growth within a few weeks.
Brown Leaf Edges
This is usually a sign of low humidity. If you see crispy brown edges on your Rex or Cane begonias, it is time to check your pebble tray or move the plant further away from a heating vent. Ensuring the air around the plant stays moist is the best way to keep the foliage looking pristine.
Yellowing Leaves
Yellow leaves can be a sign of overwatering. In the winter, the "water only when dry" rule is essential. If the soil feels soggy, stop watering immediately and allow it to dry out completely before your next session. If the yellowing is happening on a tuberous begonia in late fall, it is simply a sign that the plant is ready for its winter nap.
What to Do Next:
- If you see yellow leaves, check the soil moisture first.
- Check your humidity levels if leaf tips look brown or crispy.
- Ensure your storage area for tubers stays above freezing but below 60°F.
Regional Success: Does Your Zone Matter?
While this guide focuses on indoor care, your USDA hardiness zone determines how much work you need to do. Begonias are generally hardy in zones 9–11. If you want a quick reference for how Longfield Gardens groups plants by region, the site’s shipping information page is also helpful.
- Zones 3–8: You must bring begonias indoors or dig up tubers if you want them to survive the winter. The ground will freeze deep enough to destroy the plant.
- Zone 9: You may be able to leave begonias in the ground if they are in a very sheltered spot and you provide a thick layer of mulch. However, bringing them in is the safest bet.
- Zones 10–11: Begonias can often stay outside all year. Even here, they may go through a period of slower growth during the "cool" months.
At us, we ship our begonias based on your specific hardiness zone to ensure they arrive at the ideal planting time for your region. Understanding your local climate helps you decide exactly when to bring your plants in for their winter holiday.
Conclusion
Caring for begonias indoors during the winter is a wonderful way to extend the life of your garden. Whether you are keeping a colorful Rex begonia on your windowsill or tucking away tuberous begonias for a well-earned rest, the process is straightforward and deeply satisfying. By paying attention to light, humidity, and the specific needs of your plant type, you can enjoy these tropical treasures for many years to come. If you are planning your spring refresh, Upright Double Begonias offer a dramatic option for containers and borders.
- Identify your type: Know if your plant needs dormancy or houseplant care.
- Watch the clock: Bring plants in before temperatures drop below 60°F.
- Mind the moisture: Water less in winter and boost humidity with pebble trays.
- Store safely: Keep dormant tubers cool, dry, and dark.
We are here to support your gardening journey every step of the way. With a little bit of winter care, your begonias will be ready to dazzle you with even more spectacular colors and blooms when the warm spring sun returns. For a compact indoor-friendly option, the Begonia Hanging Golden Balcony is another standout choice.
"Winter care is not just about survival; it's about preparing your garden for its next great performance."
FAQ
How do I know if my begonia is tuberous or fibrous-rooted?
The easiest way to tell is by looking at the flowers and the base of the plant. Tuberous begonias usually have very large, rose-like flowers and a thick, potato-like lump at the soil line. Fibrous-rooted begonias, like Wax or Cane types, have many thin, thread-like roots and smaller, more frequent clusters of blooms.
Can I keep my tuberous begonia growing all winter instead of letting it go dormant?
It is not recommended. Tuberous begonias have a biological clock that requires a rest period to stay healthy. If you force them to grow through the winter, they often become weak, leggy, and prone to disease. Letting them sleep ensures a much better show of flowers in the summer. For container setup ideas, see How to Plant Tuberous Begonias in Containers.
Why is my Rex begonia losing its bright colors indoors?
This is almost always due to low light. While Rex begonias don't like direct sun, they still need "bright indirect" light to produce those vivid pigments. Try moving your plant closer to a window or adding a small grow light to help it regain its colorful glow.
My stored tubers feel soft or mushy. What should I do?
If a tuber feels mushy or has a foul smell, it has likely developed rot. This usually happens if the tuber was too wet when stored or if the storage area was too damp. You should discard any mushy tubers immediately so the rot doesn't spread to the healthy ones. If only a small spot is soft, you can try cutting it away and letting the tuber dry, but usually, a firm tuber is the only one that will grow well.
