How to Successfully Overwinter Begonias Indoors

Table of Contents

1. Introduction
2. Identify Your Begonia Type
3. Overwintering Tuberous Begonias through Dormancy
4. Keeping Wax and Cane Begonias as Houseplants
5. Special Care for Rex Begonias
6. The Simple Rules of Winter Care
7. Moving Begonias Back Outside
8. Troubleshooting Common Winter Issues
9. Conclusion
10. FAQ

Introduction

Watching your begonias flourish during the summer is one of the true highlights of the gardening season. These versatile plants offer everything from cascading blooms in hanging baskets to striking, colorful foliage in shaded garden beds. As the first touch of autumn chill hits the air, you might find yourself wishing you could keep that beauty around for just a little longer. The good news is that you do not have to say goodbye to your favorite plants when the temperatures start to drop.

At Longfield Gardens, we believe that gardening should be a year-round source of joy. Learning how your begonias can overwinter indoors is a wonderful way to extend your gardening hobby into the colder months. Whether you want to keep them growing as active houseplants or store them as dormant tubers, the process is straightforward and very rewarding. By following a few simple steps, you can ensure your plants are ready to put on another spectacular show when spring returns.

This guide will walk you through the different methods for saving your begonias based on the specific varieties you grow. We will cover how to identify your plants, the best ways to move them inside, and how to provide the care they need to survive the winter. With a little bit of planning, you can preserve your investment and enjoy the satisfaction of seeing your plants thrive for many years to come.

Identify Your Begonia Type

Before you bring any plants inside, you must determine which type of begonia you are growing. Not all begonias handle the winter in the same way. Some prefer to stay green and active all year, while others require a period of deep rest to stay healthy. Using the right method for the right plant is the first step toward success.

Tuberous Begonias

Tuberous begonias are famous for their large, rose-like flowers and their ability to brighten up shady corners. These plants grow from a thick, potato-like root called a tuber. In their native environments, these plants go dormant during the dry season. To survive a US winter, they need a similar period of rest. You will usually find these in varieties like the Non Stop series or Illumination series. If your plant dies back to the ground after a frost but has a solid, woody root underneath, it is likely a tuberous type.

Wax Begonias and Fibrous Begonias

Wax begonias are the classic bedding plants often used in garden borders or containers. They have fleshy, succulent-like stems and waxy leaves that can be green, bronze, or variegated. These begonias have a fibrous root system rather than a tuber. They do not have a natural dormancy period. If you provide enough light and warmth, they will continue to grow and even bloom throughout the winter.

Rex and Foliage Begonias

Rex begonias are grown primarily for their stunning leaves, which feature swirls of silver, purple, pink, and green. Like wax begonias, they have fibrous roots or creeping rhizomes. They do not go dormant and are often kept as year-round houseplants. They are particularly sensitive to humidity and light, making them a slightly more advanced choice for overwintering, but they are well worth the effort.

Cane-Stemmed Begonias

Often called "Angel Wing" begonias because of the shape of their leaves, these plants grow tall, bamboo-like stems. They are very sturdy and can become quite large over several years. Like the wax and Rex types, these are evergreen and will stay active indoors if given a bright spot near a window.

Key Takeaway: Always check the root system and growth habit of your begonia before choosing an overwintering method. Tuberous begonias must go dormant, while fibrous and rhizomatous types should stay active as houseplants.

Overwintering Tuberous Begonias through Dormancy

Tuberous begonias are stunning in the summer, but they need a "winter nap" to recharge for the following year. Trying to keep a tuberous begonia growing actively indoors all winter can often lead to a weak plant that fails to bloom well the next summer. The dormancy method is the most reliable way to keep these varieties healthy.

Timing the Transition

The best time to start the process is when you notice the foliage beginning to yellow in late summer or early autumn. This is the plant's way of saying it is finished for the season. You can also wait until the first light frost hits. A light frost will blacken the leaves but will not harm the tuber protected underground. This cold snap often acts as a signal for the plant to move all its energy down into the root. If you want a broader refresher on the process, see How to Overwinter Begonia Plants.

Lifting and Cleaning the Tubers

Once the foliage has yellowed or been touched by frost, carefully dig up the tubers. Use a garden fork or a small hand trowel to lift the soil around the plant. Be gentle, as the tubers can be brittle. Once they are out of the ground, cut the stems back to about one or two inches above the tuber.

Shake off the loose excess soil, but do not worry about getting them perfectly clean yet. Do not wash them with water, as excess moisture can lead to rot during storage. Let the tubers sit in a dry, protected area like a garage or a porch for a few days. This allows the outer skin to "cure" or toughen up. For more on lifting and storing tubers, Can Begonias Be Planted in the Ground? covers the basics.

Proper Storage Conditions

After the tubers have dried for a few days, the remaining stem segments should fall off easily. If they do not, give them a few more days. Once the stems are gone, you can brush away any remaining dry soil.

To store them, you need a medium that holds just a tiny bit of moisture but stays mostly dry. Common choices include:

• Dry peat moss
• Vermiculite
• Perlite
• Wood shavings or sawdust

Place the tubers in a cardboard box or a paper bag filled with your chosen medium. Make sure the tubers are not touching each other. This prevents a single spot of rot from spreading to the whole group. Store the box in a cool, dark, and dry place. A basement or a cool closet that stays between 40°F and 50°F is ideal. Avoid areas that might freeze or places that are too warm, like a furnace room.

Monthly Check-ins

Even though the plants are dormant, it is a good idea to check on them once a month. Look for any tubers that feel soft or mushy. If you find one, remove it immediately to protect the others. If the tubers look shriveled, you can very lightly mist the storage medium with water, but be careful not to overdo it.

What to do next:

• Wait for the first light frost to trigger dormancy.
• Lift tubers carefully and cut stems to one inch.
• Cure the tubers in a dry spot for several days.
• Pack in dry peat moss or vermiculite in a cardboard box.
• Store in a cool, dark location around 45°F.

Keeping Wax and Cane Begonias as Houseplants

If you have wax, Angel Wing, or bedding begonias, you do not need to let them go dormant. In fact, these plants enjoy the transition to life indoors. Because they are tropical perennials, they can live for many years if they are protected from the frost. Bringing them inside is a simple way to keep your home bright and cheerful during the dark winter months.

Preparing the Plants for the Move

The most successful transitions happen when you move the plants before the weather gets too cold. Aim to bring your begonias inside when nighttime temperatures are still in the 50s. This minimizes the shock of moving from a cool garden to a warm, dry house. If you want help choosing a suitable planting window, the hardiness zone map is a useful place to start.

If your begonias are in the ground, you will need to pot them up. Choose a container with excellent drainage holes. Begonias hate sitting in soggy soil. Use a high-quality, soil-free potting mix. We recommend avoiding garden soil for indoor pots. Garden soil is too heavy and can bring unwanted pests or diseases into your home.

Cleaning for Pests

Before you bring any plant inside, give it a thorough inspection. Look under the leaves and along the stems for hitchhikers like aphids, spider mites, or fungus gnats. A simple way to clean the plants is to give them a gentle spray with a garden hose to knock off any insects. You can also use a mild insecticidal soap if you see active pests. Taking the time to clean your plants now will save you a lot of trouble later in the winter.

Managing the Transition Shock

It is normal for a begonia to drop a few leaves when it first moves indoors. The light inside a house is much lower than the light outdoors, even on a cloudy day. The plant reacts by shedding its "outdoor" leaves and growing new ones that are better adapted to lower light levels. To help the plant adjust, place it in the brightest spot you have for the first few weeks, then move it to its permanent winter home. If you want a broader overview of indoor and outdoor care, see How to Plant and Care for Begonias.

Light and Temperature Needs

Indoor begonias need bright, indirect light. A window facing east or west is usually perfect. If you only have a north-facing window, you might need to use a small grow light to keep the plant from getting "leggy" (stretching toward the light).

Keep the temperature consistent. Begonias prefer the same temperatures that humans do—somewhere between 65°F and 75°F. Keep them away from cold drafts near doors or the drying heat of radiators and vents. For ideas on shade-loving plants that perform well outdoors, browse Summer Flowers for Shade.

Special Care for Rex Begonias

Rex begonias are the divas of the begonia world, but their spectacular foliage makes them worth the extra attention. While they follow the same general rules as wax begonias, they have a few specific needs that will help them thrive during an indoor winter.

The Importance of Humidity

The biggest challenge for Rex begonias indoors is dry air. Modern heating systems strip moisture from the air, which can cause the edges of the beautiful leaves to turn brown and crispy. To keep your Rex begonia happy, you need to boost the humidity around the plant.

The best way to do this is with a pebble tray. Fill a shallow tray with small stones and add water until it is just below the top of the stones. Set your begonia pot on top of the stones. As the water evaporates, it creates a humid microclimate right where the plant needs it. Avoid misting the leaves directly with a spray bottle, as trapped water on the foliage can lead to fungal issues or leaf spots.

Watering and Soil

Rex begonias have very fine, sensitive roots. They like to be kept consistently moist but never waterlogged. A good rule is to wait until the top inch of soil feels dry to the touch before watering again. When you do water, do it thoroughly until water runs out of the drainage holes, then empty any water that collects in the saucer.

Key Takeaway: Rex begonias thrive on humidity. Use a pebble tray to prevent brown leaf edges and avoid overwatering, which can lead to root rot.

The Simple Rules of Winter Care

Once your begonias are settled indoors, your goal is to help them survive until spring, not necessarily to push for massive growth. Winter is a slow time for plants because the days are shorter and the light is weaker.

Water Correctly, Not Constantly

Overwatering is the most common reason plants fail indoors. In the winter, plants use much less water than they do in the summer. Always check the soil with your finger before reaching for the watering can. If the soil feels damp, wait a few more days. For most indoor begonias, the "deep water, then dry out" method works best. This encourages the roots to grow deep into the pot looking for moisture.

Skip the Fertilizer

Most begonias do not need fertilizer during the winter. Since they aren't growing quickly, the extra nutrients can build up in the soil and burn the roots. Wait until you see new, vigorous growth in late February or March before you start a regular feeding schedule. When you do start fertilizing, use a balanced, water-soluble fertilizer at half the recommended strength.

Pruning for Shape

If your cane-stemmed or wax begonias start to look a bit wild or thin, do not be afraid to prune them. Cutting back the stems by a few inches encourages the plant to branch out and become bushier. This is also a great time to remove any yellowing leaves or spent flowers to keep the plant looking its best.

Moving Begonias Back Outside

As the days get longer and the weather warms up, it is exciting to think about moving your plants back to the garden. However, patience is key. Begonias are tropical plants and have no tolerance for frost.

Watching the Temperature

Do not move your begonias outside until the nighttime temperatures are consistently above 50°F. Even if the days are warm, a cold night can stun the plant and set back its growth for weeks. In most regions, this means waiting until a few weeks after the last expected frost date.

The Hardening Off Process

Your plants have been living in a protected, low-light environment all winter. Moving them directly into the sun will cause the leaves to burn. You must "harden them off" by gradually reintroducing them to the outdoors.

1. Place them in a fully shaded, protected spot for a few hours on a mild day.
2. Bring them back inside at night.
3. Over the next 7 to 10 days, gradually increase their time outside and their exposure to filtered sunlight.
4. Once they are acclimated, you can plant them back in the garden or move their containers to their summer spots.

Replanting Tubers

For the tubers you stored in dormancy, you can start them indoors about 6 to 8 weeks before the last frost. Place the tubers in a shallow tray of potting mix with the hollow side facing up. Keep them in a warm, bright spot and water sparingly until you see sprouts. This gives them a head start so you can enjoy flowers much earlier in the summer. For timing details, see the Shipping Information page.

Troubleshooting Common Winter Issues

Even with the best care, you might run into a few hurdles. Most indoor begonia problems are easy to fix if you catch them early.

Leaf Drop

As mentioned before, some leaf drop is normal during the transition. However, if the plant continues to lose leaves all winter, it might be a sign of low light or poor drainage. Try moving the plant to a brighter window and double-check that the pot isn't sitting in a puddle of water inside its decorative saucer.

Brown Leaf Edges

This is almost always a sign of low humidity. If you aren't using a pebble tray, now is the time to start. It can also be a sign of "salt" buildup from tap water. If you have hard water, try using filtered water or rainwater for your begonias occasionally to flush out the soil.

Leggy Growth

If your begonia stems are getting very long and thin with a lot of space between the leaves, it is "reaching" for more light. Move it closer to a window or add a small LED grow light to provide the energy the plant needs to stay compact.

Fungus Gnats

These tiny black flies live in the top layer of damp soil. They are more of a nuisance than a danger to the plant, but they are a sign that the soil is staying too wet. Let the soil dry out more between waterings, and the gnats will usually disappear on their own.

Conclusion

Overwintering begonias is a rewarding way to save your favorite varieties and enjoy a touch of the garden inside your home. Whether you are tucking tuberous begonias away for a quiet winter rest or placing a Rex begonia on your windowsill, the effort you put in now pays off with bigger, healthier plants next summer. Gardening is all about learning and observing, and bringing these tropical beauties indoors gives you a great chance to see how they grow up close.

At Longfield Gardens, we want to help you make your home and garden as beautiful as possible. Saving your plants from year to year is not just practical; it connects you more deeply to the rhythm of the seasons. Remember that every garden and every home is different, so do not be afraid to experiment to find the perfect spot for your winter guests. You can also explore About Us to learn more about our approach.

• Identify if your begonia needs dormancy (tuberous) or stays active (fibrous).
• Use high-quality potting mix and clean pots for indoor plants.
• Monitor water and humidity closely during the dry winter months.
• Be patient with the transition back to the garden in the spring.

Saving your begonias is a simple, effective way to ensure a head start on next year's color. With just a little bit of care, these plants will continue to reward you season after season.

FAQ

Can all begonias stay green indoors through the winter?

No, tuberous begonias specifically require a dormancy period to remain healthy and produce flowers the following year. While you can keep them in a pot, you should stop watering them and let the foliage die back so the tuber can rest. Wax, Rex, and cane-stemmed begonias, however, are evergreen and can stay green and active all winter if provided with enough light and warmth.

How do I know if my begonia is tuberous or fibrous?

The easiest way to tell is by looking at the base of the plant. Tuberous begonias grow from a single, thick, brown root that looks like a flattened potato or a ginger root. Fibrous begonias have a mass of thin, thread-like roots that spread throughout the soil. Additionally, tuberous begonias usually have larger, more dramatic flowers, while fibrous types like wax begonias have smaller flowers and thicker, waxy leaves.

Should I fertilize my begonias while they are indoors for the winter?

Generally, you should avoid fertilizing begonias during the winter months. Because there is less natural sunlight, the plants grow much more slowly and do not require extra nutrients. Adding fertilizer during this time can lead to a buildup of salts in the soil, which can damage the roots. It is best to wait until you see vigorous new growth in the early spring before you begin a regular feeding routine.

My begonia is losing leaves after I brought it inside. Is it dying?

It is very common for begonias to drop leaves when moved indoors. This is usually a reaction to the change in light and humidity rather than a sign of disease. The plant is simply adjusting its foliage to match the new environment. As long as the stems remain firm and you see new, smaller leaves beginning to grow, your plant is likely healthy and just needs a little time to acclimate to its winter home.