Introduction
There is something incredibly rewarding about watching a favorite plant thrive and grow larger with each passing season. Begonias are a perfect example of this joy, offering lush foliage and brilliant blooms that feel like a tropical escape in your own backyard. Knowing how to winter a begonia plant allows you to preserve that beauty year after year, turning a single season of color into a long-term gardening success story.
At Longfield Gardens, we believe that gardening should be a relaxing and successful experience for everyone. Saving your begonias for next year is a simple process once you understand the specific needs of the variety you are growing. Whether you have tuberous begonias that require a winter nap or stunning Rex and Angel Wing varieties that can live as houseplants, the steps are straightforward and achievable.
This guide is designed for home gardeners who want to protect their investment and enjoy even bigger, better blooms next spring. We will walk you through the timing, the techniques for different types of begonias, and the best ways to store them so they return with vigor. By following these steps, you can ensure your garden remains a vibrant, colorful sanctuary for years to come.
Preserving your begonias through the winter is an easy win that rewards your patience with a spectacular display every summer.
Understanding Your Begonia Type
Before you start preparing for the cold, it is important to know which type of begonia you are growing. Not all begonias handle the winter in the same way. Some are "tuberous," meaning they grow from a thick, potato-like root that stores energy. Others are "fibrous" or "rhizomatous," and these plants behave more like traditional houseplants. Matching your winter care to the specific plant type is the first step toward success.
Tuberous Begonias
Tuberous begonias are famous for their massive, rose-like flowers and their ability to brighten up shady corners. Varieties like the Non-Stop series or the cascading Illumination series are garden favorites because they provide constant color all summer long. These plants have a natural life cycle that includes a period of dormancy.
In their native habitats, they experience a dry season where they die back to the ground to save energy. In a typical US garden, the onset of winter triggers this same response. To keep these plants alive, we must help them enter this dormant state and protect the tubers from freezing temperatures.
Rex and Cane-Type Begonias
Rex begonias are grown primarily for their electrifying foliage, featuring swirls of silver, purple, and deep green. Cane-type begonias, often called Angel Wing or Dragon Wing begonias, grow upright with stems that resemble bamboo and clusters of delicate flowers. Unlike tuberous types, these begonias do not go dormant.
They prefer to keep growing all year round. In most parts of the country, they cannot survive a frost, so they must be brought indoors to live as houseplants until the weather warms up again. Because they don’t go "to sleep," their care involves managing light and humidity rather than storage.
Wax Begonias
Wax begonias are the classic bedding plants often found in parks and borders. While they are technically perennials in very warm climates, most gardeners treat them as annuals. They have fibrous roots rather than tubers. You can bring them indoors, but they often require very high light levels to look their best during the winter. Most gardeners find it easiest to start with fresh plants in the spring, but the process for keeping them is the same as for Cane-type begonias.
Key Takeaway: Identifying your plant is the foundation of winter success. Tuberous begonias need a cool, dry resting period, while Rex and Cane types need a cozy spot inside your home.
How to Overwinter Tuberous Begonias
For tuberous begonias, the goal of winter care is to guide the plant into a healthy rest. Think of this as a "power nap" that allows the plant to come back even stronger next year. The process involves three main phases: preparation, curing, and storage.
Preparation: Timing Your Move
The best time to start the process is in late summer or early fall. As the days grow shorter and the night temperatures begin to dip into the 50s, the plant will naturally start to slow down. At this stage, you should stop fertilizing. This tells the plant to stop producing new leaves and start sending energy down into the tuber for storage.
You can also begin to reduce watering. Let the soil dry out more than usual between waterings. If your begonias are in the ground, you can wait until the first light frost kills back the top growth. The foliage will turn black or mushy, but don't worry—the tuber underground is still safe. If your begonias are in pots, you have the option to bring them into a garage or shed before the frost hits to let them dry out naturally.
Digging and Curing the Tubers
Once the foliage has died back, it is time to lift the tubers. Use a hand trowel or a garden fork to gently lift the root ball out of the soil. Be careful not to nick or bruise the tuber, as any damage can lead to rot during storage. At this point, the stems should be easy to remove. If they don't fall off with a gentle tug, you can cut them back to about an inch above the tuber.
The next step is "curing." This is a vital part of the process where the tuber dries out and the skin toughens up.
- Find a dry, shaded area that stays between 60°F and 70°F.
- Spread the tubers out on a tray or a piece of cardboard.
- Avoid direct sunlight, as this can dry them out too fast.
- Let them sit for about two to three weeks.
During this time, any remaining soil will dry up and become easy to brush off with your hands or a soft brush. Once the tubers feel firm and dry to the touch, they are ready for their long winter sleep.
Choosing the Right Storage Material
Proper storage is about balancing moisture. You want the tuber to stay dry enough so it doesn't rot, but not so dry that it shrivels up and dies. We recommend using a breathable packing material to provide a stable environment. Good options include:
- Dry peat moss
- Wood shavings or sawdust
- Vermiculite
- Sand
Place a layer of your chosen material in a cardboard box or a paper bag. Arrange the tubers so they aren't touching each other. This prevents any potential issues from spreading between plants. Cover them with more packing material and close the container.
Finding the Ideal Storage Spot
The perfect storage spot is dark, dry, and cool. Ideally, the temperature should stay between 40°F and 50°F. A root cellar, an unheated basement, or a cool closet in a garage usually works well. It is important that the temperature stays above freezing. If the tubers freeze, the water inside their cells will expand and destroy the plant.
What to do next:
- Mark your calendar for the first frost date in your area.
- Gather your storage supplies (cardboard boxes and peat moss) in advance.
- Check your stored tubers once a month to ensure they remain firm and healthy.
Transitioning Begonias Indoors as Houseplants
If you are growing Rex, Cane, or Rhizomatous begonias, you don't need to worry about tubers or dormancy. Instead, you get to enjoy these plants as part of your indoor decor. However, the transition from the humid, bright outdoors to the dry, climate-controlled indoors can be a bit of a shock for any plant.
The Pest Inspection
Before you bring any plant into your home, it is essential to check for "hitchhikers." Insects like aphids, spider mites, or mealybugs love begonias. Check the undersides of the leaves and the spots where the leaves meet the stems.
A simple win is to give the plant a gentle spray with a garden hose to knock off any visible pests. You can also wipe the leaves with a damp cloth. If you see signs of insects, consider using a mild insecticidal soap according to the label instructions before the plant enters your living space.
Adjusting to Indoor Light
The light inside a house is much weaker than the light outdoors, even on a cloudy day. To help your begonias adjust, place them in the brightest spot you have. An east or west-facing window is usually perfect. If the plant starts to look "leggy" (long stems with few leaves), it is likely searching for more light.
If you don't have a bright window, begonias respond very well to artificial grow lights. You don't need a complex setup; a simple LED grow bulb in a standard lamp can provide the extra boost they need to stay vibrant through the dark winter months.
Managing Humidity and Water
The biggest challenge for indoor begonias is the dry air caused by home heating systems. Begonias thrive in humidity. When the air is too dry, the edges of the leaves may turn brown and crispy. To fix this without a messy humidifier, you can create a pebble tray.
A pebble tray is just a shallow dish filled with small stones and a little water. Place your begonia pot on top of the stones, making sure the bottom of the pot isn't sitting directly in the water. As the water evaporates, it creates a small zone of humid air right around the foliage.
When it comes to watering, remember the rule: "deep, then let it dry." In the winter, begonias grow more slowly and need less water than they do in the summer. Always check the soil with your finger. If the top inch feels dry, it's time to water. If it still feels damp, wait a few more days.
Winter Maintenance
During the winter, you should stop or significantly reduce fertilizing. Since the plant isn't growing as fast, it doesn't need the extra nutrients. Feeding a dormant or slow-growing plant can lead to a buildup of salts in the soil, which can damage the roots.
If your plant drops a few leaves shortly after moving inside, don't worry. This is a common way for begonias to react to a change in environment. They will often grow new leaves that are better adapted to the lower light levels of your home.
Key Takeaway: Indoor begonias appreciate a bright window, a boost in humidity, and a light hand with the watering can. Treat them like valued roommates, and they will reward you with beautiful foliage all winter.
Common Winter Scenarios and Solutions
Every garden is different, and sometimes the weather doesn't follow the rules. Here are a few common situations you might encounter and the best way to handle them.
Scenario: The Unexpected Early Frost
If a surprise frost hits before you've had a chance to move your begonias, don't panic. Tuberous begonias are actually quite resilient. As long as the ground didn't freeze solid, the tuber is likely fine. Simply cut away the damaged black foliage and proceed with the digging and curing process as normal. For Rex or Cane types, move them indoors immediately. Trim off the frost-damaged leaves; as long as the stems are still firm, the plant will usually recover and grow new foliage from the center.
Scenario: High Humidity in Storage
If you live in a very humid climate, your stored tubers might be at a higher risk for rot. In this case, use a very dry packing material like sand or vermiculite, and avoid using plastic bags. Check the tubers more frequently—perhaps every two weeks. If you see a small soft spot, you can often save the tuber by cutting out the soft area and letting it dry out completely before putting it back into storage.
Scenario: Space-Saving for Large Collections
If you have dozens of begonias, individual pots can take up a lot of room. For tuberous varieties, the box-and-peat method is the ultimate space-saver. For foliage begonias, you can take small cuttings in late summer. These cuttings will root easily in water or moist potting soil, allowing you to keep the "genetics" of your favorite plants on a sunny windowsill without needing to bring in massive heavy pots.
Waking Up Begonias in the Spring
The excitement of spring is even better when you know your stored begonias are ready to grow. Around 8 to 10 weeks before the last expected frost date in your area, it's time to check on your tubers. Look for "eyes" or small pink/green bumps on the concave side of the tuber. These are the new sprouts.
Starting Tubers Indoors
To get a head start on the season, you can "start" your tubers indoors.
- Fill a shallow tray with well-draining potting mix.
- Place the tubers on the surface with the hollow side facing up.
- Press them gently into the soil, but don't bury them deeply. The top of the tuber should be just at the soil line.
- Water them lightly and place the tray in a warm, bright spot.
Once the sprouts are a few inches tall and have a couple of leaves, you can move them into their individual summer pots.
Hardening Off
Whether you kept your begonias as houseplants or started tubers indoors, they need to be "hardened off" before they live outside permanently. This means gradually getting them used to the wind, sun, and temperature swings of the outdoors. Start by putting them in a shaded, protected spot for an hour or two a day, gradually increasing the time over a week.
Wait until all danger of frost has passed and the nighttime temperatures stay consistently above 50°F before leaving them outside overnight. This patience ensures that your plants don't experience a setback right at the start of their best growing season.
What to do next:
- Identify your local "last frost" date so you know when to start your tubers.
- Keep a small supply of fresh potting soil on hand for spring replanting.
- Check the "eyes" on your tubers in late winter to see if they are waking up early.
Why Quality Matters for Longevity
When you start with high-quality plants, the process of wintering them becomes much easier. Strong, healthy plants produce robust tubers and resilient stems that are better equipped to handle the stress of dormancy or moving indoors. At Longfield Gardens, we work with experienced growers to ensure that the begonias we ship are at the peak of health.
Our trial gardens allow us to evaluate different varieties for their performance and vigor. We only offer plants that we know will provide a beautiful display for our customers. This focus on quality means your begonias are more likely to thrive during the summer and survive the winter, giving you the best possible results for your efforts.
We stand behind our plants with a 100% quality guarantee. If your items arrive with any issues, our team is here to help. When you start with a healthy foundation, the simple steps of winter care become a rewarding part of your yearly gardening rhythm.
Conclusion
Wintering your begonia plants is a wonderful way to connect with the natural cycles of your garden. It transforms the way you look at your plants, moving from a single-season mindset to a long-term partnership with your landscape. Whether you are tucking tuberous begonias into a bed of peat moss or finding the perfect sun-drenched window for your Rex begonias, these small acts of care ensure a more beautiful yard and garden for the years ahead.
- Identify if your begonia is a tuberous type (needs dormancy) or a foliage type (needs to be a houseplant).
- Dig and cure tuberous begonias after the first frost, then store them in a cool, dry place.
- Bring foliage begonias inside before the cold hits and provide extra humidity.
- Start your tubers indoors in late winter for a head start on spring blooms.
Our team at Longfield Gardens is dedicated to helping you succeed in every season. By taking a little time this fall to protect your begonias, you are setting the stage for a spectacular display of color and texture next summer. Gardening is a journey, and saving your favorite plants is one of the most satisfying steps you can take along the way.
"The effort you put into protecting your plants during the winter is always repaid in the vibrant colors of spring. It is one of the simplest ways to grow your garden and your confidence as a gardener."
FAQ
Can I leave my tuberous begonias in their pots over the winter?
Yes, you can leave them in the pots if you have a cool, frost-free place to store the entire container. Simply stop watering in the fall, cut back the foliage once it dies, and move the dry pot to a basement or garage. This is an easy way to store them, though digging the tubers allows you to inspect them for health and save space. See this guide to overwintering begonias in pots for additional guidance.
My begonia tuber is shriveled in the spring; is it still alive?
A slightly wrinkled tuber is often just thirsty and can still be viable. If it is still firm when you squeeze it, it likely just needs to be planted and watered to wake up. However, if the tuber feels hollow, light, or mushy, it has likely either dried out completely or rotted and should be replaced.
Why did my Rex begonia lose all its leaves when I brought it inside?
This is a common reaction to the lower humidity and different light levels inside a home. The plant is shedding leaves that are efficient at outdoor light levels to grow new ones that work better indoors. Keep the soil lightly moist and provide a pebble tray for humidity, and you should see new growth appear within a few weeks. The indoor begonia care guide covers these adjustments in more detail.
Is it necessary to use a fungicide on stored begonia tubers?
While not strictly necessary for most home gardeners, dusting tubers with a sulfur-based fungicide can provide an extra layer of protection against rot. This is most helpful if you have had issues with rot in the past or if your storage area tends to be slightly damp. For most situations, keeping the tubers dry and well-ventilated is enough to keep them healthy.
