Growing Begonias Indoors in Winter: A Care Guide

Table of Contents

1. Introduction
2. Identifying Your Begonia Type
3. Bringing Begonias Indoors as Houseplants
4. Essential Winter Care for Indoor Begonias
5. Overwintering Tuberous Begonias
6. Regional Advice for Winter Success
7. Troubleshooting Common Winter Issues
8. Summary of Begonia Winter Care
9. FAQ

Introduction

As the autumn air turns crisp and the first frost approaches, many gardeners feel a pang of sadness saying goodbye to their summer blooms. Begonias are among the most beloved garden plants, offering everything from massive, rose-like flowers to electrifying, colorful foliage. The good news is that you don't have to treat these plants as annuals. Bringing your begonias indoors in winter is a rewarding way to extend the gardening season and keep your favorite varieties thriving for years to come.

At Longfield Gardens, we want to help you enjoy the beauty of begonias throughout every season. Whether you are growing tuberous begonias for their spectacular summer show or enjoy the year-round charm of Rex and wax begonias, winter care is straightforward once you know a few basics. This guide will walk you through the process of moving your plants inside, whether you want them to keep growing on a sunny windowsill or prefer to let them rest until spring.

Understanding the specific needs of your plant is the key to success. This post covers the different methods for overwintering based on the type of begonia you have, from storage techniques for tubers to humidity tips for indoor foliage. With a little preparation, you can ensure your begonias survive the cold months and return even stronger next year. For a broader overview of begonia types, see our What is a Begonia Plant? guide.

Identifying Your Begonia Type

Before you bring any plants inside, you need to know exactly which type of begonia you are growing. Begonias are a diverse group of plants, and their winter needs vary significantly. Some varieties want to stay green and active all winter, while others require a period of deep sleep, known as dormancy.

Tuberous Begonias

These are the heavy hitters of the shade garden. Varieties like the 'Non-Stop' series or 'Illumination' cascading begonias grow from a thick, potato-like underground structure called a tuber. They produce large, dramatic flowers. These begonias require a dormant period in the winter to recharge for the next growing season. They cannot stay green indoors all year; they must be allowed to die back and rest. If you grow the Non-Stop Mix, it should be stored and rested for winter.

Wax and Fibrous Begonias

Wax begonias are the classic bedding plants often seen in garden borders. They have succulent stems and waxy, rounded leaves that are either green or bronze. These plants have a fibrous root system rather than a tuber. They do not go dormant. You can bring them indoors as houseplants, where they may even continue to bloom if they receive enough light.

Rex and Rhizomatous Begonias

These begonias are grown primarily for their incredible foliage. Rex begonias feature swirling patterns of silver, purple, pink, and burgundy. Rhizomatous begonias are identified by their thick, fleshy stems (rhizomes) that creep along the surface of the soil. Both types are excellent houseplants. They prefer to stay active during the winter, though their growth will naturally slow down during the shorter days.

Cane-Stemmed Begonias

Often called Angel Wing begonias because of their wing-shaped leaves, these plants grow tall, woody stems with distinct joints, similar to bamboo. Like wax and Rex begonias, cane types do not go dormant. They are very happy living indoors near a bright window through the winter months.

Key Takeaway: Always check the base of your plant. If it grows from a thick, woody tuber and has large, fleshy flowers, it likely needs a winter nap. If it has thin, fibrous roots or creeping surface stems, it can stay active as a houseplant.

Bringing Begonias Indoors as Houseplants

If you have wax, Rex, or cane-stemmed begonias, you can treat them as houseplants until spring. The transition from the humid, breezy outdoors to a climate-controlled home can be a bit of a shock, so a gradual move is the best approach.

Step 1: The Transition Period

Plants are sensitive to sudden changes in light and temperature. If you wait until a frost is forecast and rush your begonias inside, they may react by dropping many of their leaves. Start the process about two weeks before you expect the first frost. Move your pots to a more shaded area of the porch or yard for a few days to get them used to lower light levels. Then, begin bringing them inside at night and putting them back out during the day. This gradual shift helps the plant adapt its "breathing" to indoor conditions. For more indoor-overwintering help, see Can You Bring Begonia Plants Inside for the Winter?.

Step 2: Pest Inspection and Cleaning

Before any plant enters your home, give it a thorough check for "hitchhikers." Look under the leaves and along the stems for aphids, mealybugs, or spider mites. A gentle spray with a garden hose can wash away many pests. For a deeper clean, you can wipe the leaves with a soft cloth and a very mild solution of water and a drop of dish soap. If the plant was growing in the ground, carefully dig it up and move it into a pot with fresh, well-draining potting soil.

Step 3: Finding the Right Spot

Indoors, begonias need bright, filtered light. A window facing east or west is usually perfect. Avoid placing them in direct, harsh afternoon sun, which can scorch the leaves. Keep your plants away from cold drafts near doors or the drying heat of radiators and vents. A steady room temperature between 60°F and 75°F is ideal.

What to do next:

• Move pots to a shady outdoor spot two weeks before frost.
• Check leaf undersides for small insects.
• Repot ground plants into containers with drainage holes.
• Place the plants in a room with bright, indirect light.

Essential Winter Care for Indoor Begonias

Once your begonias are settled inside, their care routine changes. Because there is less sunlight in winter, the plants grow more slowly and need less intervention.

Mastering Winter Watering

The most common mistake gardeners make with begonias indoors in winter is overwatering. In the cooler, darker months, soil takes much longer to dry out. Begonias are susceptible to root rot if they sit in soggy soil.

Wait until the top inch of soil feels dry to the touch before watering. When you do water, do it thoroughly until water runs out of the drainage holes, then empty the saucer. If the leaves look yellow or feel mushy, the plant is likely getting too much water. If the edges of the leaves turn brown and crispy, it may be too dry. For a deeper look at winter watering, see How to Care for My Begonia Plant.

Boosting Humidity

Our homes become very dry in the winter due to heating systems. Begonias love humidity, which simply means the amount of moisture in the air. You don't need a greenhouse to keep them happy.

A simple "pebble tray" is a great solution. Fill a shallow tray with small stones or pebbles and add water until it is just below the tops of the stones. Set your begonia pot on top of the pebbles. As the water evaporates, it creates a small pocket of humid air right around the foliage. Avoid misting the leaves with a spray bottle, as trapped water on begonia leaves can lead to fungal issues like powdery mildew. If low humidity is a recurring problem, our begonia winter care guide covers more ways to help.

Pausing the Fertilizer

Since the plants aren't actively pushing out a lot of new growth in the winter, they don't need extra food. Stop fertilizing your begonias in late autumn. You can resume a regular feeding schedule in the spring once you see new leaves beginning to emerge and the days grow longer.

Pruning for Health

It is normal for a few older leaves to yellow and drop during the winter. Simply pinch these off to keep the plant tidy. If a cane-type begonia becomes too tall or "leggy" (stems that are long with few leaves), you can trim the stems back by about a third. This encourages the plant to grow fuller and bushier when spring arrives.

Key Takeaway: Think of winter as a "maintenance mode" for your begonias. Focus on providing bright light and just enough water to keep the soil from drying out completely.

Overwintering Tuberous Begonias

Tuberous begonias are different. They need a rest period to stay healthy. If you try to force them to grow all winter, the tuber will eventually weaken and the plant may not bloom well the following year. For additional growing advice, browse Tips for Growing Tuberous Begonias.

Recognizing the Signs of Dormancy

As the days get shorter in September and October, you will notice your tuberous begonias starting to look a bit tired. The leaves may turn yellow, and the plant will stop producing new flowers. This is a natural signal that it is time to go to sleep. You can help this process by reducing the amount of water you give the plant.

If a light frost hits before you've moved the plant, don't worry. A touch of frost actually tells the plant to send all its energy down into the tuber. However, you must dig them up before a "hard" or killing frost that freezes the ground.

Digging and Curing

If your begonias are in the ground, carefully lift the entire root ball with a garden fork. If they are in pots, you can simply pull the plant out of the container.

1. Trim the stems: Cut the stems back so only about an inch or two remains above the tuber.
2. Clean gently: Shake off the excess soil, but don't worry about getting them perfectly clean yet. Be careful not to nick or bruise the fleshy tuber.
3. Curing: This is the most important step. Lay the tubers out on a newspaper in a warm, dry, and airy place (like a garage or a basement) for about two weeks. This allows the outer skin to toughen up, which prevents rotting during storage. After two weeks, any remaining bits of stem should go brittle and fall off easily. If you're not sure which end of the tuber faces up, this planting guide is helpful.

Storing for the Winter

Once cured, your tubers are ready for their winter home. Place them in a cardboard box or a paper bag. To keep the moisture levels stable, many gardeners pack them in slightly damp peat moss, vermiculite, or sawdust.

Store the box in a cool, dark, and dry place. The temperature should ideally stay between 40°F and 50°F. An unheated basement or a cool closet usually works well. Check on your tubers once a month. If any feel soft or show signs of mold, remove them immediately to keep the rest of the batch healthy.

What to do next:

• Reduce watering in October to encourage dormancy.
• Lift tubers after the first light frost.
• Let tubers dry (cure) on newspaper for 14 days.
• Store in a box with peat moss in a cool, dark area.

Regional Advice for Winter Success

Depending on where you live, your strategy for begonias indoors in winter might change slightly. While the plants themselves have the same requirements, the external environment plays a role in how you manage them.

Northern Gardeners

In colder climates, the transition indoors happens earlier, often in September. Because winter days are very short in the North, your indoor begonias will almost certainly stop blooming and enter a state of semi-dormancy. Don't worry if they look a bit static; they are just waiting for more light. Using a simple grow light can help keep foliage begonias like Rex looking vibrant through the dark months of January and February. To check your area, use the Hardiness Zone Map.

Southern Gardeners

In the South, you may be able to leave your begonias outside much longer. In frost-free areas, some begonias can stay in the garden year-round. However, even if it doesn't freeze, winter is often the "rainy season" in many Southern states. Begonias hate being cold and wet at the same time. If your winter involves lots of rain and temperatures in the 40s, it is still a good idea to move your potted begonias under a porch roof or into a garage to keep their roots from rotting in the damp soil.

Moving Back Outdoors in Spring

Regardless of your region, the "hardening off" process in spring is just as important as the acclimation in fall. Once the danger of frost has passed and night temperatures stay above 50°F, you can begin moving your plants back outside. Start with just an hour or two in a shaded spot, gradually increasing their time in the sun and air over the course of a week.

For stored tubers, you can start them indoors in pots about 6 to 8 weeks before the last frost date. This gives them a "head start" so you get flowers much earlier in the summer. Place the tuber hollow-side up in a pot of moist soil, barely covering the top, and put it in a warm, bright spot. For step-by-step timing, see How to Start Tuberous Begonias Indoors.

Troubleshooting Common Winter Issues

Gardening is a learning process, and sometimes your begonias might show signs of stress. Most winter problems are easy to fix by adjusting one or two simple things.

Dropping Leaves

If your wax or Rex begonia suddenly sheds leaves after being moved inside, it is likely reacting to the change in humidity or light. As long as the stems feel firm and you see small green buds at the joints, the plant is okay. Just reduce your watering and wait for it to adjust. It will grow new leaves that are better suited to the indoor environment.

Powdery Mildew

This looks like a light dusting of white flour on the leaves. It usually happens when the air is too still and damp. To fix this, improve the air circulation around your plants. Make sure they aren't crowded too closely together. If you see affected leaves, snip them off and dispose of them to stop the spread.

Yellowing Foliage

Yellow leaves are almost always a sign of too much water. Remember that plants "breathe" through their roots, and they need air as much as they need water. If the soil stays saturated, the roots can't function. Let the soil dry out significantly before the next watering. If the plant is in a pot with no drainage holes, move it to a different container immediately.

Leggy or Stretched Stems

If your begonia is growing long, thin stems with lots of space between the leaves, it is "reaching" for more light. Move it to a brighter window or add a small LED grow light nearby. You can also pinch back the tips of the stems to encourage the plant to grow more compactly.

Key Takeaway: Most begonia issues in winter can be solved by doing less, not more. Less water and less fertilizer, combined with a little more light, will solve the majority of problems.

Summary of Begonia Winter Care

Taking care of begonias indoors in winter is a simple way to protect your investment and enjoy beautiful greenery year-round. By matching your care to the specific type of begonia you own, you can ensure each plant gets exactly what it needs to thrive.

• Identify: Know if your plant is a tuberous, wax, Rex, or cane-type begonia.
• Acclimate: Move indoor varieties inside gradually to prevent leaf drop.
• Water Wisely: Only water when the top inch of soil is dry; never let the plant sit in water.
• Humidity: Use pebble trays to keep the air moist around foliage begonias.
• Dormancy: Allow tuberous begonias to die back, then cure and store the tubers in a cool, dark place.
• Patience: Expect slower growth during the winter months and wait for spring to resume fertilizing.

At Longfield Gardens, we believe that gardening should be a source of joy, not stress. Keeping your begonias through the winter is a wonderful way to connect with your plants on a deeper level. When spring arrives and you see those first green shoots emerging from a stored tuber or a fresh flush of growth on a Rex begonia, you'll know that your simple winter care steps were well worth the effort. If you'd like more growing inspiration, visit our Begonias collection or browse Upright Double Begonias.

"The secret to wintering begonias is understanding their natural rhythm. Whether they are sleeping or just growing slowly, a light touch and a bright window are your best tools for success."

Ready to start your begonia collection or add new varieties for the coming season? Browse our selection of premium begonias and find the perfect colors for your home and garden.

FAQ

Can I keep my tuberous begonias growing as houseplants all winter?

It is not recommended to keep tuberous begonias growing through the winter. These plants naturally require a dormant period to rest their internal systems. If forced to grow year-round, the plant will eventually become weak, produce fewer flowers, and the tuber may fail. It is much better to let them sleep for a few months so they can return with vigor in the spring.

Why are the edges of my Rex begonia leaves turning brown?

Brown, crispy edges on begonia leaves are usually a sign of low humidity. The air in our homes in the winter is much drier than the outdoor air begonias prefer. To fix this, place the pot on a pebble tray filled with water or move the plant to a naturally more humid room, like a bathroom or kitchen, provided there is enough light. If you'd like a broader overview of winter issues, see Can You Grow Begonias Indoors in the Winter?.

Do I need to fertilize my begonias while they are indoors?

No, you should generally stop fertilizing begonias during the winter. Because the days are shorter and temperatures are cooler, the plants are not in an active growth phase. Adding fertilizer during this time can lead to a buildup of salts in the soil, which can damage the roots. Start fertilizing again in the spring once you see consistent new growth.

How do I know if my stored begonia tubers are still healthy?

Check your stored tubers once a month during the winter. A healthy tuber should feel firm, similar to a potato. If a tuber feels soft, mushy, or looks shriveled and dried out like a prune, it has likely rotted or desiccated. If you see any fuzzy mold growing on the surface, wipe it off and ensure the storage medium (like peat moss) isn't too wet. If you need help with order timing or delivery, see our Shipping Information page.