Can You Plant a Begonia Outside? A Simple Guide to Success

Table of Contents

1. Introduction
2. Understanding Your Begonia Type
3. When to Move Begonias Outdoors
4. Finding the Perfect Outdoor Spot
5. How to Plant Begonia Tubers and Transplants
6. Essential Care for Outdoor Begonias
7. Handling Challenges: Pests and Weather
8. Safety Note: Pets and Children
9. What to Do When the Season Ends
10. Why Begonias Are Worth the Effort
11. Conclusion
12. FAQ

Introduction

Bringing a splash of vibrant color to a shaded porch or a quiet corner of the yard is one of the most rewarding parts of the spring season. Begonias are a favorite for this very reason, offering lush foliage and brilliant blooms that seem to glow in the shadows. If you have been admiring these plants in a greenhouse or keeping them as houseplants, you might find yourself wondering: can you plant a begonia outside?

The short answer is a resounding yes. Begonias are incredibly versatile plants that thrive in outdoor settings across the United States, provided the conditions are right. At Longfield Gardens, we see firsthand how these tropical beauties can transform a summer landscape into a lush, floral retreat. Browse our begonia collection for current options.

In this guide, we will walk through everything you need to know about transitioning begonias to your garden. We will cover the different types available, the best timing for planting, and the simple care steps that ensure your plants flourish from late spring until the first frost. For a classic tuberous example, Begonia Upright Double Roseform Pink is a favorite.

With a little bit of planning regarding temperature and light, you can enjoy the nonstop beauty of begonias in your own beds, borders, and containers.

Understanding Your Begonia Type

Before you grab your trowel, it is helpful to know which type of begonia you are working with. While they all belong to the same family, different varieties have slightly different preferences for light and moisture. Matching the right plant to the right place is the first step toward a beautiful garden.

Tuberous Begonias

These are the showstoppers of the begonia world. Tuberous begonias grow from a thickened underground stem called a tuber. They are famous for their large, dramatic flowers that can look like roses, camellias, or carnations. They come in two main forms: upright and trailing. Upright varieties are perfect for garden beds and window boxes, while trailing types are the gold standard for hanging baskets, which makes our Hanging Begonias collection especially useful. These begonias prefer partial shade and need well-draining soil to keep their tubers healthy.

Wax Begonias (Fibrous-Rooted)

If you have ever seen a tidy row of begonias bordering a walkway, they were likely wax begonias. These are fibrous-rooted plants with shiny, succulent-like leaves that are either green or bronze. They are incredibly tough and can handle more sun than most other varieties. Wax begonias are often grown as annuals and are loved for their "self-cleaning" nature, meaning they drop their old blooms automatically so you don't have to deadhead them.

Rex Begonias

Rex begonias are grown primarily for their breathtaking foliage rather than their flowers. Their leaves feature swirls of silver, purple, burgundy, and emerald green. While often kept as houseplants, they make excellent additions to outdoor containers in deep shade. They bring texture and color to areas where few other plants can thrive.

Cane Begonias (Angel Wing)

Named for their long, bamboo-like stems and wing-shaped leaves, cane begonias are upright and elegant. They often feature silver spots on their leaves and produce clusters of drooping flowers. These can grow quite tall in a single season, making them great "thriller" plants for the center of a large outdoor pot. For another upright option, browse Upright Double Begonias.

Key Takeaway: Identify your begonia type first. Wax begonias handle more sun and heat, while tuberous and Rex varieties prefer cooler, shaded spots with plenty of airflow.

When to Move Begonias Outdoors

Timing is everything when it comes to planting begonias outside. Because these plants are native to tropical and subtropical climates, they have no natural defense against freezing temperatures. To keep your plants happy and healthy, patience is your best friend.

The Magic Number: 60°F

The most important rule for begonias is to wait for the weather to warm up. We recommend waiting until the danger of frost has completely passed and night temperatures are consistently above 50°F or 60°F. If you're not sure about your area, check the Hardiness Zone Map.

In most parts of the country, this means planting outdoors in late May or early June. A quick check of your local weather forecast or a soil thermometer can take the guesswork out of the process. If you plant too early, a late-season cold snap could damage the tender stems and leaves.

Hardening Off Your Plants

If you have been growing your begonias indoors or just brought them home from a warm greenhouse, they need a little time to adjust to the "real world." This process is called hardening off.

For about 7 to 10 days before you plant them in the ground, place your begonias outside in a sheltered, shady spot for a few hours each day. Gradually increase their time outside and their exposure to light. If you are starting tubers indoors, our How to Start Tuberous Begonias Indoors guide walks through the process.

Shipping and Planting Windows

When you order bulbs or tubers, they are typically shipped based on your USDA hardiness zone. This ensures they arrive close to the time they should be started. If you receive your tubers while there is still snow on the ground, don't worry. See our Shipping Information for the details. You can start them indoors in pots about 8 to 12 weeks before the last frost. This gives them a head start so they are already established by the time the summer weather arrives.

Finding the Perfect Outdoor Spot

Once the weather is warm, the next step is choosing the right location. Begonias are famous for their love of shade, but "shade" can mean many things.

Light Requirements

Most begonias prefer filtered light or dappled shade. Imagine the light under a tall tree where the sun peeks through the leaves—that is the "sweet spot."

• Morning Sun: A spot that gets 2 to 4 hours of gentle morning sun followed by afternoon shade is ideal for tuberous begonias.
• Deep Shade: Rex begonias and some cane varieties thrive in full shade, making them perfect for north-facing porches.
• Full Sun: While some bronze-leafed wax begonias can tolerate full sun in northern climates, they generally perform better if they have some relief from the scorching afternoon heat.

For more planting ideas by light level, explore our Summer Flowers for Shade collection.

If you notice the leaves of your begonia turning brown and crispy at the edges, it might be getting too much direct sun. If the plant becomes "leggy" (stretched out with few flowers), it is likely looking for a bit more light.

Soil and Drainage

The word "drainage" simply refers to how fast water leaves the soil. Begonias have succulent stems that hold a lot of moisture, which makes them prone to rotting if they sit in soggy earth.

For the best results, use a light, fertile soil mix. If you are planting in the ground, you can improve heavy clay soil by mixing in some compost or finely ground bark. If you are working with pots or planters, Easy Summer Bulbs for Shady Containers has more container-friendly guidance. This creates air pockets in the soil, allowing the roots to breathe and water to move through freely.

Airflow

Begonias enjoy humidity, but they also need good air circulation. If plants are packed too tightly together, they can develop powdery mildew (a white, dusty-looking fungus on the leaves). Spacing your plants 8 to 12 inches apart ensures they have the room they need to grow and stay dry between waterings. For a broader overview of begonia types, read All About Begonias.

• What to do next:
  • Observe your garden at different times of day to find spots with dappled light.
  • Check your soil after a rain; if water puddles for hours, consider using a raised bed or container.
  • Plan your spacing—give each plant at least 8 inches of breathing room.

How to Plant Begonia Tubers and Transplants

Whether you are starting with dormant tubers or young plants from a nursery, the planting process is straightforward.

Planting Tuberous Begonias

Tuberous begonias are unique because the tubers have a definite "top" and "bottom." When you look at the tuber, you will see a side that is indented or bowl-shaped. This is the top, where the sprouts will emerge.

1. Prepare the spot: Loosen the soil to a depth of about 6 inches.
2. Position the tuber: Place the tuber in the soil with the indented side facing up.
3. Depth: Cover the tuber with only about a half-inch of soil. If you bury them too deeply, they may struggle to sprout.
4. Spacing: Space tubers about 10 to 12 inches apart.
5. Water: Give them a gentle drink to settle the soil around them, but don't soak them until you see active growth.

If you want a quick visual reference, our How to Plant Tuberous Begonias: Which End Is Up? guide explains the tuber shape in more detail.

Planting Transplants (Wax or Cane)

If you are moving a potted begonia into the garden, treat it like any other bedding plant.

1. Dig a hole: Make the hole twice as wide as the current pot and just as deep.
2. Loosen the roots: If the plant is "root-bound" (roots circling the inside of the pot), gently tease them outward with your fingers.
3. Leveling: Set the plant in the hole so the top of the root ball is level with the surrounding soil.
4. Backfill: Fill in the gaps with soil and press down gently with your hands to remove large air pockets.

Key Takeaway: For tuberous begonias, remember "hollow side up." Keeping them near the surface of the soil prevents rot and encourages faster sprouting.

Essential Care for Outdoor Begonias

Once your begonias are settled in their outdoor home, a few simple maintenance tasks will keep them blooming beautifully all season long.

Watering Correctly

The goal with begonias is to keep the soil "evenly moist." This means the soil should feel like a wrung-out sponge—not soaking wet, but not bone-dry either.

• The Finger Test: Stick your finger two inches into the soil. If it feels dry, it is time to water. If it still feels damp, wait a day.
• Avoid the Foliage: When watering, try to direct the stream at the base of the plant. Getting the leaves wet constantly can lead to fungal issues or leaf spotting.
• Container Considerations: Plants in pots and hanging baskets dry out much faster than those in the ground. During the heat of mid-summer, you may need to water your containers every day.

For more detailed care tips, see Tips for Growing Tuberous Begonias.

Feeding Your Plants

Begonias are "heavy feeders," meaning they need regular nutrients to produce those spectacular flowers. A balanced, water-soluble fertilizer applied every two to three weeks is usually sufficient. Alternatively, you can mix a slow-release granular fertilizer into the soil at planting time. This provides a steady "snack" for the plants throughout the season.

Pruning and Deadheading

Most modern begonias are bred to be low-maintenance. Wax begonias and many hybrid varieties like the "Surefire" series are self-cleaning. If you want a low-maintenance planting that keeps the color coming, Non Stop Begonias are a good match. Tuberous begonias, however, may benefit from having spent blooms removed. This keeps the plant looking tidy and encourages it to put more energy into new flowers.

If your cane begonias or wax begonias start to look "leggy" or stretched out, don't be afraid to pinch back the stems. Using your thumb and forefinger to snap off the top inch of a stem will encourage the plant to grow more side branches, resulting in a fuller, bushier look.

Handling Challenges: Pests and Weather

Gardening always involves a bit of cooperation with nature. While begonias are generally trouble-free, there are a few things to keep an eye on.

Managing Pests

Outdoors, begonias are occasionally visited by slugs or snails, especially in damp, shaded areas. These pests like to nibble on the tender leaves. A simple way to manage them is to keep the area around your plants free of leaf litter and debris where they like to hide.

You might also see aphids or mealybugs. A quick spray with a garden hose can often knock these insects off. For persistent issues, an insecticidal soap can be helpful, but always follow the label instructions carefully.

Wildlife

While begonias are not the first choice for deer and rabbits, hungry animals will sometimes take a nibble. If you live in an area with high deer pressure, consider placing your begonias in pots on a raised porch or using a physical barrier like a decorative garden fence.

Rainy Periods

Extended periods of heavy rain can be a challenge for begonias. Because they prefer to dry out slightly between waterings, constant rain can lead to soggy soil. If you have begonias in containers, you can temporarily move them under a porch roof or awning during a week of heavy storms to prevent the roots from becoming waterlogged.

Safety Note: Pets and Children

It is important to note that begonias contain calcium oxalate crystals. If ingested, these can cause irritation to the mouth and throat in pets and humans. To be safe, keep your begonias out of reach of curious puppies, kittens, or small children. Hanging baskets are an excellent way to enjoy begonias while keeping them safely out of reach.

What to Do When the Season Ends

As summer winds down and the first hints of autumn appear, you have a few choices for your begonias. Because they are not frost-hardy, they will not survive a winter in zones 2 through 8.

Treating Them as Annuals

Many gardeners choose to enjoy their begonias for one glorious season and then compost them in the fall. This is a simple, stress-free approach that allows you to try new varieties and colors every year.

Overwintering Tuberous Begonias

If you have grown tuberous begonias, you can save the tubers to plant again next year.

1. Wait for frost: Let the first light frost touch the foliage. This tells the plant it is time to go dormant.
2. Dig them up: Carefully lift the tubers out of the soil and cut the stems back to about an inch.
3. Dry them out: Let the tubers sit in a sunny, dry spot indoors for about a week until the remaining stem falls off naturally.
4. Store: Place the clean, dry tubers in a paper bag or a box filled with peat moss or sawdust. Keep them in a cool, dark, and dry place (like a basement or garage) where temperatures stay between 40°F and 50°F.

Bringing Them Indoors as Houseplants

Rex begonias and cane begonias often make the transition from outdoors to indoors quite well. Before the first frost, bring the pots inside and place them in a bright window. They may drop a few leaves as they adjust to the lower humidity of your home, but they will often bounce back and continue to grow as houseplants throughout the winter.

• What to do next:
  • Mark your calendar for the average first frost date in your area.
  • Decide if you want to store your tubers or treat the plants as annuals.
  • If bringing plants inside, check them thoroughly for any "hitchhiking" bugs before they enter the house.

Why Begonias Are Worth the Effort

There are very few plants that can compete with the sheer color output of a begonia in the shade. While many shade plants focus on green textures, begonias provide the "wow factor" usually reserved for full-sun gardens. A container-friendly example like Begonia Upright Double Superba White keeps that look neat and full.

At Longfield Gardens, we believe that gardening should be a source of joy, not a chore. That promise is backed by our 100% Quality Guarantee. The reason we recommend begonias so highly is that once they are planted in the right spot, they are remarkably self-sufficient. They don't require constant pruning, they are relatively drought-tolerant once established, and they bloom consistently from the moment they are planted until the frost arrives.

Whether you are a seasoned gardener or someone just starting out with their first patio pot, begonias offer a high reward for a small amount of care. Their ability to thrive in those "difficult" shady spots makes them an essential tool for creating a beautiful, cohesive landscape.

Conclusion

Planting a begonia outside is a simple way to bring professional-looking color to your home. By waiting for warm weather, choosing a spot with dappled light, and ensuring your soil has good drainage, you are setting yourself up for a successful growing season. These plants are resilient, beautiful, and adaptable to many different garden styles.

• Wait for nighttime temperatures to stay above 50-60°F before planting.
• Choose a location with morning sun and afternoon shade for best results.
• Water only when the top of the soil feels dry to the touch.
• Save your tuberous begonias in the fall for a head start next spring.

We are here to help you grow a garden you love. To find your next favorite variety and see our full selection of begonias, visit our website and let us help you get growing.

Gardening is about the journey as much as the bloom. With begonias, that journey is filled with nonstop color and simple, rewarding care that anyone can achieve.

FAQ

Can begonias grow in full sun?

Most begonias prefer shade or partial sun, but some varieties can handle more light. Wax begonias with bronze foliage are the most sun-tolerant and can perform well in full sun in northern climates, provided they receive consistent moisture. Tuberous and Rex begonias, however, will likely scorch or wilt if left in the direct afternoon sun.

Do I need to deadhead my begonias to keep them blooming?

It depends on the type. Wax begonias and many hybrid varieties are "self-cleaning," meaning they drop their old flowers and don't require deadheading. Tuberous begonias don't strictly require it to keep blooming, but removing spent flowers helps the plant look tidier and prevents old petals from rotting on the leaves during wet weather.

How often should I water my begonias outside?

The frequency of watering depends on your local weather and whether the plant is in the ground or a pot. Generally, you should water whenever the top two inches of soil feel dry. In the height of summer, begonias in hanging baskets or containers may need water every day, while those in the ground might only need it two or three times a week.

Are begonias perennial or annual?

In most of the United States (USDA zones 2-8), begonias are treated as annuals because they cannot survive freezing temperatures. However, they are technically tender perennials. In frost-free climates (zones 9-11), they can live outdoors year-round. In colder zones, you can overwinter the tubers or bring certain varieties indoors as houseplants to keep them alive for the next year.