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Longfield Gardens

Are Begonias Inside or Outside Plants? How to Choose

Table of Contents

  1. Introduction
  2. The Versatile World of Begonias
  3. Tuberous Begonias: The Outdoor Stars
  4. Wax Begonias: The Flexible All-Rounders
  5. Rex Begonias: The Indoor Foliage Favorites
  6. Cane-Stemmed Begonias: The Best of Both Worlds
  7. Choosing Based on Your Light
  8. The Role of Climate and Hardiness Zones
  9. Planting for Success: Indoors vs. Outdoors
  10. Water and Fertilizer: The Basics of Care
  11. Transitioning: The "Hardening Off" Process
  12. Overwintering: Bringing the Outside In
  13. Matching the Variety to the Location
  14. Common Myths About Begonia Locations
  15. Summary of Begonia Placement
  16. Conclusion
  17. FAQ

Introduction

Finding a plant that fits perfectly into your lifestyle is one of the most rewarding parts of gardening. Whether you have a sprawling shaded backyard or a sunny windowsill in a city apartment, begonias are often the answer. These versatile plants are famous for their lush foliage and jewel-toned flowers, but a common question many gardeners ask is whether begonias are meant to be inside or outside plants.

The simple answer is that begonias can be both, depending on the variety you choose and the climate where you live. At Longfield Gardens, we see these begonias as the ultimate bridge between the indoor and outdoor garden. They provide a splash of color to porch containers all summer and can transition to becoming elegant houseplants when the weather turns chilly.

In this guide, we will explore the different types of begonias and help you determine which ones belong in your garden beds and which ones should stay on your dining room table. Whether you are a beginner looking for your first easy-win plant or an experienced gardener planning a shade garden, understanding the "where" and "how" of begonias will ensure your plants stay healthy and vibrant. Begonias are flexible, adaptable, and surprisingly easy to grow once you know a few basic rules.

The Versatile World of Begonias

Begonias are a massive family of plants with over 2,000 different species. Because they originate from tropical and subtropical climates, they have a natural love for warmth and humidity. This heritage is exactly why they work so well in two very different environments: the humid heat of a North American summer and the stable, protected environment of a modern home.

When deciding if a begonia should be inside or outside, the first step is identifying which type you have. Most begonias fall into four main categories: tuberous, wax, rex, and cane-stemmed (often called angel-wing). Each has a "preferred" home, but many can adapt if their basic needs for light and water are met.

In most parts of the United States, begonias are treated as outdoor annuals. They spend the summer brightening up shady corners and then are either brought inside for the winter or composted. However, in warmer regions like Florida or parts of California (Zones 8-11), many begonias can stay outside year-round. For everyone else, the indoor-outdoor transition is a seasonal rhythm that keeps the garden going through the frost.

Tuberous Begonias: The Outdoor Stars

Tuberous begonias are the showstoppers of the begonia world. They grow from a thick, potato-like underground stem called a tuber. These are the Upright Double Begonias we often feature at Longfield Gardens because they produce massive, rose-like blooms in shades of apricot, scarlet, yellow, and white.

Why They Love the Outdoors

Tuberous begonias are primarily outdoor plants. They thrive in the filtered light of a porch or the dappled shade under a large tree. They are particularly popular for Hanging Begonias and window boxes because their heavy flower heads and lush leaves create a full, luxurious look.

While they can be started indoors to get a head start on the season, they usually perform best outside where they can benefit from natural air circulation and the cooling effect of evening dew. Their primary requirement is shade; intense afternoon sun can scorch their delicate petals and leaves.

Can They Live Indoors?

You can keep tuberous begonias indoors temporarily while they are blooming, but they are not the best long-term houseplants. They have a specific life cycle that requires a period of dormancy. Once the weather gets cold in the fall, tuberous begonias naturally want to shut down and rest for the winter. Trying to keep them growing in a warm living room year-round often leads to a spindly plant that refuses to bloom.

Key Takeaway: Tuberous begonias are best treated as outdoor summer stars that "sleep" indoors as dormant tubers during the winter months.

Wax Begonias: The Flexible All-Rounders

If you have ever seen neat rows of red or pink flowers in a public park or a garden border, you were likely looking at wax begonias. These are named for their glossy, waxy leaves that help the plant retain moisture.

Outdoor Bedding Plants

Wax begonias are the most common "outside" begonia. They are incredibly tough and can handle more sun than their tuberous cousins. They are often used as bedding plants because they stay compact and bloom continuously from planting until the first frost. They are an "easy win" for beginners because they don't require much fussing once they are in the ground.

Transitioning Indoors

Wax begonias are unique because they transition between inside and outside very easily. If you have a favorite wax begonia in a pot on your patio, you can simply move it to a sunny windowsill before the first frost. They will continue to bloom indoors throughout the winter as long as they get enough light. Many gardeners treat them as "disposable" annuals, but they are perfectly happy to live as year-round houseplants.

Rex Begonias: The Indoor Foliage Favorites

Rex begonias are grown for their spectacular leaves rather than their flowers. Their foliage comes in swirls of silver, purple, burgundy, and emerald green. Because they are so focused on leaf production, they have slightly different needs than the flowering varieties.

Why They Excel Indoors

Rex begonias are the kings of the indoor begonia world. They prefer the consistent temperatures of a home and do not like the dramatic temperature swings that can happen outdoors. Their leaves are somewhat fragile and can be damaged by heavy rain or strong winds. Indoors, on a pebble tray to provide a little extra humidity, they look like living pieces of art.

Can They Go Outside?

You can move Rex begonias outside for the summer, but they must stay in full shade. They are great for adding color to a shaded patio table where their intricate leaf patterns can be admired up close. However, they are sensitive to the heat. If your summer afternoons are consistently above 90°F, a Rex begonia will likely be happier inside in the air conditioning.

Cane-Stemmed Begonias: The Best of Both Worlds

Cane-stemmed begonias, commonly called angel-wing begonias due to the shape of their leaves, are perhaps the most versatile of all. They grow on tall, bamboo-like stems and can reach several feet in height.

Indoor Elegance

In many homes, an angel-wing begonia is a legacy plant passed down through generations. They are incredibly resilient houseplants. They can tolerate lower light than wax begonias and are less fussy about humidity than Rex begonias. Their silver-spotted leaves and clusters of drooping flowers make them a beautiful focal point in a living room.

Outdoor Summering

Many gardeners choose to "summer" their cane begonias outdoors. Moving these plants to a shaded porch for the months of June, July, and August often results in a massive growth spurt. The natural light and humidity of the outdoors act like a tonic for them. Just remember to bring them back inside well before the nights drop below 50°F.

Choosing Based on Your Light

The "inside or outside" question often comes down to one factor: light. Begonias are often called shade plants, but "shade" means something very different indoors versus outdoors.

Understanding Outdoor Light

When we say a begonia needs shade outdoors, we usually mean filtered light or morning sun. Total, dark shade under a heavy evergreen hedge is often too dark for flowering varieties like tuberous begonias. They need about four hours of indirect light to produce those big, beautiful blooms. However, the direct, midday sun in a US summer is too intense. It can literally cook the water inside the fleshy stems of the plant.

Understanding Indoor Light

Indoors, the "shade" of a room is often too dark for a begonia. To a plant, a spot ten feet away from a window is nearly pitch black. If you are keeping begonias inside, they need "bright, indirect light." This means a spot near a window where the sun doesn't shine directly onto the leaves, or a window with a sheer curtain. If your begonia starts to look "leggy"—meaning the stems are long, thin, and stretching toward the glass—it is telling you it needs more light.

What to do next:

  • Observe your yard: Find the spots that get morning sun but afternoon shade.
  • Check your windows: Identify North or East-facing windows for indoor begonias.
  • Avoid the "Hot Zone": Never place an indoor begonia in a South-facing window without a curtain to block direct rays.

The Role of Climate and Hardiness Zones

Your location in the United States plays a huge role in whether your begonias are inside or outside plants. In the gardening world, we use the USDA Hardiness Zone Map to explain which plants can survive the winter outdoors.

Warm Climates (Zones 8-11)

In the Southern US, the Southwest, and parts of the West Coast, begonias are often permanent outside plants. They can live in the ground year-round. In these areas, the challenge isn't the cold; it’s the heat and humidity. Gardeners in these zones need to ensure their begonias have excellent drainage (how fast water leaves the soil) so the roots don't rot during heavy tropical rains.

Cooler Climates (Zones 3-7)

For the majority of the US, begonias are outside plants only for the summer. They are "frost-tender," which means even a light touch of frost will turn their leaves to mush. In these zones, you have two choices:

  1. Treat them as annuals and plant fresh tubers or starts each spring.
  2. Bring them inside to overwinter.

At Longfield Gardens, we ship our tubers based on your specific zone’s planting time; see our Shipping Information for details. We make sure they arrive when your soil is warming up and the danger of frost is passing, so your outdoor begonias get the best possible start.

Planting for Success: Indoors vs. Outdoors

Whether you are placing a begonia in a garden bed or a decorative pot for your kitchen, the planting process is the foundation of success.

Soil and Drainage

Begonias hate "wet feet." This is true whether they are inside or outside.

  • Outdoors: If you are planting in the ground, choose a spot where water doesn't puddle after a rain. Mixing in some compost or peat moss can help create the loose, airy soil begonias love.
  • Indoors: Use a high-quality potting mix, not garden soil. Look for a mix that contains perlite (the little white "popcorn" bits) to help with drainage. Ensure every indoor pot has a hole at the bottom.

Planting Tuberous Begonias

If you are starting with tubers, remember the "bowl" rule. How to Plant Tuberous Begonias: Which End Is Up? explains which side should face up. One side of the tuber has a slight depression or hollow. This side should face up. Cover the tuber with only about an inch of soil. If you plant them too deep, the sprouts might struggle to reach the surface.

Spacing and Airflow

Outside, don't crowd your begonias. Giving them about 8 to 12 inches of space allows air to move between the plants. This prevents common issues like powdery mildew, which looks like a dusting of white flour on the leaves. Indoors, try to avoid huddling too many plants together in a corner for the same reason.

Water and Fertilizer: The Basics of Care

Begonias are consistent plants. They don't like to be flooded with water, and they don't like to be bone-dry. The goal is "evenly moist."

The "Finger Test"

The best way to tell if your begonia—inside or out—needs water is to stick your finger an inch into the soil. If it feels dry, it’s time to water. If it feels damp, wait a day or two.

  • Outdoor Watering: Container plants dry out much faster than those in the ground. During a heatwave, a hanging basket might need water every day.
  • Indoor Watering: Indoor plants dry out much slower. Overwatering is the most common cause of trouble for indoor begonias. If the leaves turn yellow and drop off, it’s often a sign the soil is too wet.

Feeding Your Plants

Begonias are "heavy feeders," meaning they use a lot of energy to produce those constant flowers and lush leaves. Tips for Growing Tuberous Begonias covers the basics of keeping them blooming.

  • Outdoors: Use a balanced, water-soluble fertilizer every two weeks during the summer.
  • Indoors: Feed once a month during the spring and summer. In the winter, when the plant’s growth slows down, you can stop fertilizing entirely.

Transitioning: The "Hardening Off" Process

If you have kept a begonia inside all winter and want to move it outside for the summer, you cannot do it all at once. The plant needs to be "hardened off." This is the process of gradually getting it used to the wind, sun, and temperature changes of the outdoors.

  1. Day 1-2: Place the plant outside in a fully shaded, protected spot for just two or three hours, then bring it back in.
  2. Day 3-4: Increase the time to five or six hours.
  3. Day 5-7: Leave it out all day, but bring it in at night.
  4. Day 8: If the nights are warm (above 60°F), the plant is ready to stay outside for the season.

This slow introduction prevents the leaves from getting "sunburned" or shocked by the sudden change in environment.

Overwintering: Bringing the Outside In

As autumn approaches, you’ll need to decide what to do with your outdoor begonias. If you have tuberous begonias, the process is very simple and doesn't even require a sunny window.

Saving Tuberous Begonias

When the leaves start to yellow in the fall, or after the first very light frost, dig up the tubers. Cut the stems back to about an inch above the tuber. Let them sit in a dry, shady spot for a few days until the soil on them feels dry. Brush off the excess dirt, wrap them in newspaper, and store them in a cool, dark place (like a basement or closet) that stays around 50°F. Next spring, they will be ready to wake up and start the cycle again!

Saving Wax and Angel-Wing Begonias

For these types, you’ll want to bring the whole plant inside. Before you bring them in, give them a good rinse with a garden hose to wash away any hitchhiking bugs. Check the undersides of the leaves carefully. Once inside, place them in a bright window. Don't be alarmed if they drop a few leaves in the first week; they are just adjusting to the lower light levels of your home.

Key Takeaway: You don't have to choose between inside or outside for many begonias; you can enjoy them outdoors in the sun and indoors during the snow.

Matching the Variety to the Location

To make your decision easier, here is a quick reference for where to put your begonias:

Common Myths About Begonia Locations

There is a lot of advice online about where begonias "must" grow, but gardening is rarely about strict rules.

Myth: Begonias can't handle any sun.

  • The Reality: While they are shade-lovers, many begonias (especially wax begonias) can handle several hours of morning sun. In cooler northern climates, begonias can actually handle more sun than they can in the deep South.

Myth: Indoor begonias need a greenhouse to survive.

  • The Reality: Most begonias are very happy in standard home temperatures (65-75°F). As long as you don't put them right next to a freezing drafty window or a blowing heater vent, they will be just fine.

Myth: You can't grow begonias in the ground.

  • The Reality: Tuberous begonias are wonderful in the ground, provided the soil is loose and well-drained. They are often used to brighten up the edges of woodland gardens alongside hostas and ferns.

Summary of Begonia Placement

Choosing where to put your begonia is about matching the plant's natural habits to your home's environment. Begonias are flexible, meaning you can experiment until you find the "sweet spot" where your plant looks its best.

Next Steps for Success:

  • Check your soil: Ensure it's light and airy for both indoor pots and outdoor beds.
  • Monitor the light: Move your plant if it looks scorched (too much sun) or leggy (too little light).
  • Water wisely: Use the finger test to avoid overwatering.
  • Plan for the seasons: Decide now if you want to save your tubers for next year or enjoy your wax begonias as year-round houseplants.

Conclusion

Whether you choose to grow begonias as permanent residents of your living room or as the stars of your summer garden, these plants offer a level of beauty that is hard to match. Their ability to thrive in both environments makes them one of the most practical choices for the modern gardener. By simply paying attention to light, drainage, and temperature, you can enjoy their vibrant colors and stunning leaves regardless of the season.

At Longfield Gardens, we believe that gardening should be a source of joy, not stress. Begonias embody this philosophy perfectly—they are reliable, versatile, and rewarding. We invite you to try a few different varieties this season. Plant some in your garden, keep one on your desk, and see for yourself why these plants have been favorites for generations.

Begonias are the ultimate "anywhere" plant. With the right variety and a little bit of care, you can bring tropical beauty into every corner of your life, both inside and out.

If you are ready to start your begonia journey, the best next step is to choose a variety that fits your favorite spot and get planting!

FAQ

Can I move my indoor begonia outside for the summer?

Yes, most indoor begonias, especially Angel-Wing and Rex varieties, love spending the summer outdoors. However, you must move them gradually through a process called "hardening off" to prevent shock. Always keep them in a shaded, protected area to avoid leaf scorch from the sun and damage from wind or heavy rain.

Do begonias need a lot of sunlight when grown indoors?

Indoor begonias need bright, indirect light rather than direct sun. A spot near an East-facing window or a South-facing window with a sheer curtain is usually ideal. If the plant doesn't get enough light, it will become "leggy" and stop blooming; if it gets too much direct sun through the glass, the leaves may turn brown and crispy.

Will begonias survive the winter outside?

In most parts of the United States (Zones 3-7), begonias will not survive the winter outside because they are very sensitive to frost. In these areas, you should either bring the plants indoors or dig up the tubers to store them in a cool, dry place. In warm, frost-free climates (Zones 8-11), begonias can often stay in the garden year-round.

How often should I water begonias in pots?

There is no set schedule, as it depends on the temperature and humidity. The best rule is to water when the top inch of soil feels dry to the touch. Outdoor pots usually need more frequent watering than indoor ones—sometimes every day in the peak of summer—whereas indoor plants might only need water once every week or two.

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