Can You Grow Begonias Outside? A Practical Guide

Table of Contents

1. Introduction
2. Can You Grow Begonias Outside?
3. Matching the Variety to Your Garden
4. Timing Your Move Outdoors
5. Finding the Perfect Location
6. How to Plant Begonias Outside
7. Summer Care for Outdoor Begonias
8. Handling Challenges: Weather and Pests
9. Overwintering: Bringing Begonias Back Inside
10. Why We Love Outdoor Begonias
11. FAQ

Introduction

There is a unique kind of excitement that comes with finding the perfect plant for a shady corner of your yard. If you have been looking for a way to add brilliant, jewel-toned color to your porch, patio, or flower beds without needing full sun, you have likely wondered: can you grow begonias outside? The answer is a resounding yes. These versatile plants are beloved by home gardeners for their ability to bloom continuously from early summer right through the first frost.

At Longfield Gardens, we know that begonias are among the most rewarding plants you can add to your outdoor space. Whether you are looking for the massive, rose-like blooms of tuberous begonias or the reliable, waxy foliage of bedding varieties, there is a begonia for almost every garden setting. This guide is designed for home gardeners who want to move beyond the windowsill and bring these tropical beauties into the open air.

We will cover the essential steps for success, including choosing the right location, timing your planting to avoid late spring chills, and maintaining healthy growth all season long. By following a few simple principles, you can transform your outdoor spaces with the effortless elegance of begonias. Growing these stunning flowers is an achievable joy for gardeners of all experience levels.

Can You Grow Begonias Outside?

The short answer is yes, you can absolutely grow begonias outside. While many people first encounter begonias as houseplants, most varieties thrive in the fresh air and natural light of an outdoor garden. In fact, many types of begonias grow more vigorously and produce more flowers when they have the space and airflow provided by an outdoor environment.

Success with outdoor begonias depends on understanding their tropical origins. Most begonias are native to the forest floors of Central and South America, Asia, and Africa. This means they are naturally adapted to warm temperatures, high humidity, and filtered light. When you move them outside, your goal is to mimic these conditions as closely as possible.

In most parts of the United States, begonias are grown as "tender annuals." This means they enjoy the warm summer months outdoors but cannot survive a freeze. In southern climates (USDA zones 9 through 11), some varieties can live outside year-round. For everyone else, growing begonias outside is a seasonal highlight that begins in late spring and lasts until the autumn air turns crisp.

Matching the Variety to Your Garden

Before you head out to plant, it is helpful to know which type of begonia you are working with. Not all begonias have the same preferences for light and moisture. Matching the right variety to your specific outdoor spot is the first step toward a beautiful display.

Tuberous Begonias

These are the showstoppers of the begonia world. They grow from a thick, potato-like tuber and produce large, spectacular flowers that often resemble roses or camellias. Tuberous begonias 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. They prefer dappled shade and consistent moisture.

Wax Begonias (Semperflorens)

If you are looking for a reliable "bedding" plant to edge a walkway or fill a large garden bed, wax begonias are the answer. They have succulent, waxy leaves that are either green or bronze. These are the most sun-tolerant of the group, though they still appreciate some protection from the intense afternoon sun. They are also incredibly resilient and keep blooming even in heat and humidity.

Rex Begonias

Rex begonias are grown primarily for their stunning foliage rather than their flowers. Their leaves feature swirling patterns of silver, burgundy, purple, and forest green. While they are popular houseplants, they make excellent additions to outdoor shade containers. They provide a high-contrast "thriller" element that looks beautiful next to ferns or hostas.

Cane-Like and Angel Wing Begonias

These begonias grow on tall, bamboo-like stems and often feature spotted, wing-shaped leaves. They can reach impressive heights when grown outdoors in large pots. They produce clusters of dangling flowers and enjoy a bit more light than the Rex varieties.

Key Takeaway: Choose tuberous begonias for big blooms in baskets, wax begonias for low-maintenance garden beds, and Rex begonias for dramatic foliage in shaded containers.

Timing Your Move Outdoors

Timing is the most important factor when moving begonias outside. Because these are tropical plants, they are very sensitive to cold. Even a light frost can damage the leaves and stems, and cold, damp soil can cause the roots or tubers to rot before they have a chance to grow.

As a general rule, do not move your begonias outside until the danger of frost has completely passed. It is best to wait until nighttime temperatures consistently stay above 50°F (10°C). If the weather is still bouncing between warm days and chilly nights, your plants will be much happier staying in a protected area like a garage or indoors near a bright window.

If you are starting with dormant tubers, many gardeners choose to "wake them up" indoors about 8 to 12 weeks before the last frost. This gives the plants a head start so they are already leafy and ready to bloom by the time the weather warms up.

What to Do Next: Timing Checklist

• Check your local estimated last frost date.
• Monitor nighttime temperatures until they stay above 50°F.
• Gradually "harden off" your plants by placing them in a sheltered outdoor spot for a few hours a day.
• Increase their time outside over 7 to 10 days before planting them in their permanent home.

Finding the Perfect Location

Once the weather is warm enough, the next step is choosing the right spot. The "right place" for a begonia is usually one that offers protection from the two things they dislike most: harsh midday sun and strong winds.

Light Requirements

Most begonias prefer "dappled" or "filtered" sunlight. This is the kind of light you find under a leafy tree or on a covered porch.

• Morning Sun: Nearly all begonias love the gentle light of the morning. An east-facing spot that gets sun until 10:00 AM or 11:00 AM is often ideal.
• Full Shade: While begonias are famous shade-lovers, "deep shade" (where no direct light ever reaches) can lead to leggy plants and fewer flowers. Aim for bright, indirect light.
• Sun Tolerance: If you have a sunnier spot, look for wax begonias with bronze-colored leaves. The darker foliage acts as a natural sunblock, helping the plant handle more direct light than green-leaved varieties.

Wind and Shelter

Begonias have succulent, watery stems that can be somewhat brittle. A strong summer thunderstorm or a very windy balcony can easily snap the stems of upright tuberous begonias. To keep your plants looking their best, tuck them into corners that are sheltered from prevailing winds or use the structure of your house to provide a windbreak.

Soil and Drainage

Begonias are very specific about their soil. They need plenty of moisture to support their lush growth, but they cannot sit in soggy soil.

• For Containers: Use a high-quality, well-draining potting mix. If the soil feels heavy, you can mix in a bit of perlite or coarse sand to improve drainage.
• In the Ground: If you have heavy clay soil, it is better to grow begonias in raised beds or containers. If you plant directly in the ground, amend the area with compost to ensure the soil stays light and aerated.

How to Plant Begonias Outside

Planting begonias is a simple process, but there are a few tricks to getting the depth and orientation right, especially for tuberous varieties.

Planting Tuberous Begonias

If you are planting dormant tubers directly into the garden or a pot, look closely at the tuber. One side will be slightly hollow or indented (like a bowl), and the other side will be rounded.

1. Direction: Plant the tuber with the hollow side facing up. This is where the sprouts will emerge.
2. Depth: Do not bury them too deep. In a container, the top of the tuber should be just barely covered with about half an inch of soil.
3. Spacing: Space tubers about 10 to 12 inches apart to allow for airflow and room to grow.

Planting Potted Begonias

If you have purchased "starts" or small plants in nursery pots, the process is even easier.

1. Dig a hole: Make it twice as wide as the current pot but no deeper.
2. Loosen the roots: If the plant is root-bound, gently tease the roots outward.
3. Leveling: Set the plant in the hole so the top of the root ball is level with the surrounding soil.
4. Watering: Water immediately after planting to help settle the soil around the roots.

Key Takeaway: When planting tuberous begonias, always place the hollow side up and barely cover the tuber with soil to prevent rot.

Summer Care for Outdoor Begonias

Once your begonias are settled in their outdoor home, they are relatively low-maintenance. However, a little consistent attention will keep them blooming at their peak through the heat of summer.

The Golden Rule of Watering

The most common mistake with begonias is overwatering. Because they have succulent stems, they store a fair amount of water internally. The goal is to keep the soil moist like a wrung-out sponge, but never saturated.

• Check the soil: Stick your finger about an inch into the soil. If it feels dry, it is time to water. If it feels damp, wait another day.
• Water at the base: Try to avoid splashing water directly onto the leaves or into the center of the plant. Wet foliage in a shaded area is an invitation for mildew and spots.
• Morning is best: Watering in the morning allows any accidental splashes on the leaves to dry out during the day.

Feeding Your Plants

Begonias are "heavy feeders," meaning they use a lot of energy to produce those constant blooms. If you are growing them in containers, the nutrients in the potting soil will be used up within a few weeks.

• Use a balanced fertilizer: A water-soluble fertilizer applied every two to four weeks is usually perfect. Look for a balanced formula (like a 10-10-10) or one slightly higher in phosphorus to encourage blooming.
• Follow the label: It is always better to under-fertilize than to over-fertilize. A half-strength solution applied more frequently is often safer than a full-strength dose all at once.

Grooming for Beauty

Most modern begonias are "self-cleaning," meaning the old flowers fall off on their own. However, you can still help the plant by doing a little light grooming.

• Deadheading: If you see spent flowers hanging on or turning brown, go ahead and pinch them off. This keeps the plant looking tidy and prevents mold from growing on old blossoms.
• Pinching: If your begonias are starting to look "leggy" (long stems with few leaves), you can pinch off the tips of the stems. This encourages the plant to branch out and become bushier.

Handling Challenges: Weather and Pests

While begonias are generally easy to care for, growing them outside does expose them to the elements. Here is how to handle the most common outdoor challenges.

Heavy Rain

A sudden downpour can be tough on begonias. Excess water can collect in the hollow "cup" of a tuber, leading to rot. If you know a major storm is coming, move your hanging baskets and containers under a porch roof. For plants in the ground, ensure your mulch is not piled up against the stems, as this can trap moisture.

Summer Heat

While begonias love warmth, they can struggle in extreme heat (above 90°F). During a heatwave, you may notice the plants wilting slightly in the afternoon. This is often a defense mechanism rather than a sign of thirst. Check the soil before watering; if the soil is already damp, do not add more water. Instead, move the plants to a deeper shade until the heat subsides.

Pests and Animals

One of the best things about growing begonias outside is that they are generally deer and rabbit resistant. Most grazers find the leaves bitter or unpalatable. You may occasionally see slugs or snails, especially in damp, shady spots. A light application of bird-safe slug bait or simply moving the pots off the ground can solve this.

Overwintering: Bringing Begonias Back Inside

As summer fades and the first frost approaches, you have a choice to make. You can treat your begonias as annuals and let them go with the season, or you can save them to grow again next year.

Saving Tuberous Begonias

This is the most popular way to "overwinter" begonias.

1. Wait for the first light frost: This will turn the foliage yellow or black, signaling to the plant that it is time to go dormant.
2. Lift the tubers: Carefully dig up the tubers and cut off the stems, leaving about an inch attached.
3. Cure: Let the tubers dry in a cool, dry place for a few days.
4. Store: Place the dry tubers in a box of peat moss or sawdust and keep them in a cool, dark place (around 45–50°F) until spring.

Saving Wax and Rex Begonias

Since these don't have large tubers, the best way to save them is to bring the entire plant inside.

1. Bring them in early: Move the pots indoors before the nighttime temperature drops below 50°F.
2. Light and water: Place them in a bright window but keep them away from heater vents, which can dry out the air. Reduce your watering significantly during the winter months while the plant rests.

Key Takeaway: In cold climates, you can save your tuberous begonias for next year by digging them up after the first frost and storing the tubers in a cool, dry place.

Why We Love Outdoor Begonias

At Longfield Gardens, we believe that every yard has a "difficult" spot—that area under the oak tree or the north-facing porch that feels a bit bare. Begonias are the perfect solution for these spaces. They bring high-impact color to the parts of the garden where other sun-loving flowers struggle to survive.

Growing begonias outside is a rewarding experience that offers a massive return on a very small investment of time. From the moment you see the first sprouts emerge from a tuber to the final flush of flowers in October, these plants provide a constant sense of beauty and accomplishment.

Whether you are a seasoned gardener or just starting your first container garden, we encourage you to give begonias a try. Their resilience, variety, and stunning visual appeal make them a must-have for any outdoor space. With the right timing and a little bit of shade, you can enjoy a tropical paradise right in your own backyard.

"Gardening with begonias is about finding beauty in the shadows. These plants prove that you don't need a sun-drenched field to have a vibrant, blooming landscape."

Next Steps for Your Begonia Garden

• Choose your style: Decide if you want the big blooms of tuberous begonias or the foliage of Rex varieties.
• Check your calendar: Wait for those 50°F nights before planting.
• Prepare your containers: Get high-quality potting soil and ensure your pots have drainage holes.
• Start small: If you're a beginner, try two or three wax begonias in a patio pot to get a feel for their watering needs.

FAQ

Can begonias grow in full sun if they are outside?

Most begonias prefer partial shade or filtered light. However, wax begonias—especially those with bronze-colored leaves—can handle significantly more sun than other types. In cooler northern climates, begonias can generally tolerate more direct sun than they can in the hot, intense light of the southern United States.

How often should I water begonias planted in the ground?

Begonias in the ground usually need water every 2 to 4 days, depending on the weather and soil type. The goal is to keep the soil consistently moist but never soggy. If you have had a heavy rain, skip watering until the top inch of soil feels dry to the touch. Always try to water at the base of the plant to keep the leaves dry. For more planting tips, see begonias in the ground.

Are begonias perennial or do I have to replant them every year?

Begonias are tropical perennials, meaning they can live for many years in frost-free regions (USDA zones 9–11). In most of the United States, they are grown as annuals because they cannot survive freezing temperatures. However, you can "overwinter" tuberous begonias by digging up the tubers and storing them indoors until spring. If you want a broader overview, read Are Begonia Plants Annuals?.

Why are the leaves on my outdoor begonias turning brown at the edges?

Brown edges on begonia leaves are usually caused by one of three things: too much direct sun (leaf scorch), low humidity, or inconsistent watering. If the plant is in a very sunny spot, try moving it to an area with more afternoon shade. Ensure you are watering deeply enough to reach the roots, and avoid letting the soil dry out completely. If you are planning new plantings, where to plant begonias for the best blooms can help you choose a better site.

When should I order begonias for spring planting?

It is best to order early so you can plant as soon as your weather is warm enough. Longfield Gardens’ Shipping Information page explains how shipping is tied to USDA hardiness zones and seasonal ship weeks.

What if I want a stronger guarantee before I buy?

Longfield Gardens backs its plants with a 100% Quality Guarantee, so you can shop with confidence.