Can I Plant a Begonia Outside?

Table of Contents

1. Introduction
2. Knowing Your Begonia Types
3. When to Move Begonias Outside
4. Choosing the Best Outdoor Location
5. How to Plant Begonias Outside
6. Watering and Feeding for Success
7. Simple Maintenance and Care
8. Bringing Begonias Back Inside
9. Enhancing Your Garden with Begonias
10. Conclusion
11. FAQ

Introduction

Begonias are a favorite for home gardeners because they offer some of the most reliable and vibrant colors you can find for shaded areas. Whether you are looking for massive, rose-like blooms or striking, patterned foliage, these plants bring a tropical flair to any backyard. At Longfield Gardens, we enjoy seeing how these versatile begonias transform porches, patios, and garden beds with very little effort.

You absolutely can plant a begonia outside, and for many varieties, the fresh air and natural light of a garden setting help them grow fuller and bloom more prolifically. This guide is for anyone who wants to transition their begonias from the indoors to the garden or start fresh with new tubers this spring. We will cover the best timing, the ideal locations, and the simple steps you can take to ensure your plants thrive all season long.

Successful outdoor planting depends on matching the right variety to your specific garden conditions. Once you understand their preference for warmth and filtered light, you can enjoy a continuous display of color from the moment you plant them until the first frost. Bringing begonias outdoors is an easy win for any gardener looking to brighten up their landscape.

Knowing Your Begonia Types

Before you move a plant outside, it helps to identify which type of begonia you have. Each variety has slightly different preferences for light and moisture. Understanding these differences allows you to choose the perfect spot in your yard.

Tuberous Begonias

These are the showstoppers of the begonia world. They grow from a thick, potato-like tuber and produce large, multi-petaled flowers that look like roses or camellias. Varieties like the Double Delight® series are popular because they have a trailing habit. This makes them perfect for hanging baskets where the heavy blooms can spill over the edges. They prefer filtered shade and consistent moisture to keep their large flowers looking fresh.

Wax Begonias

Wax begonias are the hardy workers of the summer garden. They are named for their glossy, waxy leaves which help them retain moisture. These begonias are usually smaller and more compact, making them excellent for edging a garden path or filling in a flower bed. Unlike some other types, wax begonias can often handle a bit more sun, especially if they have bronze-colored foliage.

Interspecific Begonias

These varieties are modern hybrids that combine the best traits of different species. The Surefire® series is a great example of an interspecific begonia. These plants are exceptionally vigorous and grow much larger than standard wax begonias. They are very adaptable and can thrive in both sun and shade, which takes the guesswork out of finding a planting location.

Rex and Rhizomatous Begonias

While many people grow these as houseplants, they can spend a very happy summer outdoors. Rex and Rhizomatous Begonias are grown primarily for their foliage, which features swirls of silver, purple, pink, and deep green. Because their leaves are so decorative, they act as a "thriller" in mixed container displays. They are more sensitive to direct sun than other types and should be kept in a protected, shady spot.

Key Takeaway: Identifying your begonia type helps you decide where to plant it. Tuberous begonias love hanging baskets in the shade, while wax and interspecific begonias are great for garden beds.

When to Move Begonias Outside

The most important rule for planting begonias outside is to wait for the warmth. These plants are tropical by nature and do not appreciate cold soil or chilly nights. If you plant them too early, they may sit still and refuse to grow, or they might be damaged by a late-season cold snap.

The 50-Degree Rule

As a general rule, you should wait to move begonias outside until nighttime temperatures are consistently above 50°F. If the nights are still dipping into the 40s, it is better to keep your plants indoors or in a protected garage. Begonias thrive when the soil has warmed up to at least 60°F. In most parts of the United States, this means waiting until late May or early June to move them into the garden permanently.

Hardening Off Your Plants

If your begonias have been growing indoors or in a greenhouse, they need a little time to get used to the outdoor environment. This process is called hardening off. Start by placing your plants in a shaded, wind-protected area for a few hours each day. Gradually increase the amount of time they spend outside over the course of a week. This prevents the leaves from scorching and helps the stems toughen up against the breeze.

Shipping and Planting Times

Our team at Longfield Gardens schedules shipments based on your USDA hardiness zone. We aim to have your tubers arrive about two weeks before the ideal planting time in your area. This gives you time to prepare your pots or garden beds so you are ready to go as soon as the weather settles.

• Check your local frost date: Use this as your baseline for when it is safe to plant.
• Observe your soil: If it feels cold to the touch, wait another week.
• Watch the forecast: Avoid planting right before a heavy rainstorm or a cold front.

Choosing the Best Outdoor Location

Once the weather is warm enough, the next step is finding the right home for your plants. Begonias are famous for loving the shade, but "shade" can mean many things. Finding the right balance of light and protection is the secret to a season of heavy blooming.

Light Requirements

Most begonias prefer filtered light or dappled shade. Imagine the light under a tall tree with a high canopy—this is the ideal environment.

• Morning Sun: A spot that gets 2 to 4 hours of soft morning sun followed by afternoon shade is usually perfect.
• Afternoon Shade: The afternoon sun is often too intense and can bleach the leaves or cause the edges to turn brown.
• Dense Shade: While they will survive in deep shade, they may produce fewer flowers. If your plant looks leggy or isn't blooming, try moving it to a spot with just a little more light.

Protection from the Elements

Begonia stems are often thick but can be quite brittle. A strong gust of wind can easily snap a heavy branch laden with flowers. To prevent this, plant your begonias in a spot that is sheltered from prevailing winds. This could be near a fence, the side of a house, or tucked among other sturdy shrubs. If you are planting in a hanging basket, make sure it is securely fastened so it doesn't swing too violently during a summer thunderstorm.

Soil and Drainage

Drainage simply refers to how fast water leaves the soil. Begonias have fleshy stems that store water, which makes them prone to rot if they sit in soggy earth.

• In the Garden: Amend your soil with compost or peat moss to create a loose, airy texture. This helps water move through while keeping enough moisture for the roots.
• In Containers: Always use a high-quality potting mix and ensure your containers have plenty of drainage holes at the bottom.

What to do next:

• Walk through your garden at different times of the day to see where the light falls.
• Identify a sheltered spot that stays out of the path of strong winds.
• Check your soil by digging a small hole and filling it with water; it should drain away within a few minutes.

How to Plant Begonias Outside

Whether you are starting with tubers or transplanting established plants, the process is straightforward. Getting the depth and spacing right early on gives your plants the room they need to reach their full potential.

Planting Tubers Directly

If you are planting upright double begonias directly into the garden or a pot:

1. Find the "Up" side: Look for the indented or hollow side of the tuber. This is where the sprouts will emerge.
2. Dig a shallow hole: Place the tuber about 1 inch deep. You do not need to bury it deep; a light covering of soil is enough.
3. Orientation: If you live in an area with very heavy rain, you can plant the tuber at a slight angle. This prevents water from pooling in the center "bowl" of the tuber, which can lead to rot.
4. Spacing: Space tubers about 8 to 12 inches apart to allow for good air circulation as they grow.

Moving Potted Plants to the Garden

If you bought begonias in nursery pots or started them indoors:

1. Prepare the hole: Dig a hole that is twice as wide as the current pot but no deeper.
2. Gently loosen the roots: If the plant is "pot-bound" (roots circling the inside of the pot), gently tease them outward with your fingers.
3. Level the plant: Set the begonia in the hole so the top of the root ball is level with the surrounding soil. Planting it too deep can cause the stem to rot.
4. Backfill and water: Fill in the gaps with soil, press down gently to remove air pockets, and water immediately to help settle the roots.

Using Containers and Hanging Baskets

Containers are one of the best ways to grow begonias because you can move them around to find the perfect light. When planting in a pot, leave about an inch of space between the top of the soil and the rim of the pot. This "headroom" makes it easier to water the plant without the soil washing over the edge. For a full look, you can plant three begonias in a 12-inch hanging basket.

Watering and Feeding for Success

Outdoor begonias need a slightly different begonia care routine than those kept inside. The wind and sun will dry them out faster, so staying on top of moisture and nutrients is key.

The Right Way to Water

The goal is to keep the soil evenly moist, like a wrung-out sponge, but never soggy.

• Check the soil daily: Stick your finger about an inch into the soil. If it feels dry, it is time to water.
• Water the base: Try to apply water directly to the soil rather than over the leaves. Wet foliage in the shade can lead to mildew or fungal issues.
• Morning is best: Watering in the morning allows any moisture on the leaves to dry during the day.
• Pots dry faster: Plants in clay pots or hanging baskets may need water every day during a heatwave.

Feeding Your Plants

Begonias are "heavy feeders," meaning they need a regular supply of nutrients to keep producing those big, beautiful flowers.

• Start with compost: Adding compost to your soil at planting time provides a slow-release source of energy.
• Use a balanced fertilizer: Every two weeks, apply a water-soluble fertilizer formulated for flowering plants. A standard "all-purpose" or "tomato" fertilizer works well.
• Avoid over-fertilizing: If you see the edges of the leaves turning brown or curling, you may be using too much. Dilute your fertilizer to half-strength to see if the plant recovers.

Simple Maintenance and Care

One of the reasons we love begonias is that they are generally low-maintenance. However, a little bit of grooming goes a long way in keeping the display looking professional and tidy.

Deadheading

Deadheading is the process of removing old, faded flowers. While many modern begonias, like the Surefire® series, are "self-cleaning" (meaning the old flowers fall off on their own), tuberous begonias benefit from a little help. Snipping off spent blooms prevents the plant from putting energy into seed production and encourages it to grow more flowers instead. It also prevents the old petals from sticking to the leaves, which can sometimes cause rot.

Pinching for Fullness

If your begonias are starting to look a little tall and "leggy" with long gaps between the leaves, you can pinch off the tips of the stems. This signals the plant to grow more side branches, resulting in a bushier, fuller appearance. Use your thumb and forefinger to snap off the top inch of a stem just above a set of leaves.

Watching for Pests

Fortunately, begonias are not a favorite snack for most garden pests. However, you might occasionally see slugs or snails if the area is very damp. Keeping the garden floor clean of fallen leaves and debris helps reduce their hiding spots. If you notice small holes in the leaves, a simple organic slug bait or a saucer of beer can usually solve the problem quickly.

Key Takeaway: Regular watering at the base of the plant and a bi-weekly feeding will keep your begonias blooming until the first frost of autumn.

Bringing Begonias Back Inside

As the summer winds down and the first frost approaches, you have a choice to make. While many gardeners treat begonias as annuals and compost them at the end of the season, you can easily save them for next year.

Saving Tuberous Begonias

When the leaves begin to turn yellow in the fall, stop watering the plant. After the first light frost kills the top growth, dig up the tubers.

1. Cut the stems back to about an inch above the tuber.
2. Let the tubers dry in a cool, sunny spot for about a week until the remaining stem falls off naturally.
3. Shake off any excess soil and store them in a box of peat moss or sawdust.
4. Keep the box in a cool, dark, and dry place (like a basement) where temperatures stay around 40-50°F.

Overwintering Wax and Rex Begonias

These can be brought back inside as houseplants. Before the first frost, prune the plants back by about a third to make them easier to manage. Check them thoroughly for any outdoor hitchhikers like aphids or spiders. Place them in a bright window with indirect light and reduce your watering frequency. They will likely slow down their growth during the winter, which is normal.

Enhancing Your Garden with Begonias

Begonias play well with others. Because they thrive in the shade, they are the perfect companions for other shade-loving plants.

Design Ideas

• Texture Contrast: Pair the bold, broad leaves of a begonia with the fine, lacy fronds of a fern.
• Color Echoing: Plant red begonias alongside caladiums that have red veins in their leaves. This creates a cohesive, designed look.
• Height Variation: Use tall cane begonias in the back of a container and trailing tuberous begonias in the front to create a "layered" effect.

Realistic Expectations

Every garden is a little different. Your begonias may grow faster or slower depending on your local humidity and soil quality. If your neighbor’s begonias are blooming sooner than yours, it might just be a difference in sun exposure. Gardening is a rewarding process of observation. If a plant doesn't seem happy in one spot, don't be afraid to move the pot a few feet to see if it prefers the new light.

Conclusion

Planting begonias outside is a wonderful way to bring life and vibrant color to the quieter, shadier corners of your yard. By simply waiting for the warm weather and choosing a spot protected from the wind, you set yourself up for a successful growing season. These plants are remarkably rewarding, offering a constant parade of blooms and beautiful foliage with minimal fuss.

Whether you choose the massive flowers of tuberous varieties or the reliable performance of wax begonias, you are adding a touch of tropical beauty to your home. We are proud to provide high-quality begonia tubers from Longfield Gardens to help you achieve these results. With a little water, some regular food, and the right light, your begonias will be the highlight of your summer garden.

• Wait for nighttime temperatures to stay above 50°F.
• Find a spot with dappled shade and protection from the wind.
• Water the soil, not the leaves, to keep the plant healthy.
• Fertilize every two weeks for the best bloom production.

Ready to get started? High-quality begonia tubers are a simple and affordable way to fill your garden with color this year.

FAQ

Can I plant begonias in full sun?

Most wax begonias prefer shade or partial shade, but some varieties like the Surefire® series or wax begonias with bronze leaves can handle more sun. If you plant them in a sunny spot, you will need to water them more frequently to prevent the soil from drying out completely. In very hot climates, afternoon shade is still highly recommended to prevent leaf scorch.

How often should I water begonias planted in the ground?

Begonias in the ground generally need water every 2 to 3 days, depending on the weather. In hot or windy conditions, they may need daily attention. The best way to tell is to check the soil moisture with your finger; if the top inch is dry, it is time to water. Always aim to keep the soil moist but never standing in water.

What should I do if my begonia leaves are turning yellow?

Yellow leaves are often a sign of too much water. If the soil feels soggy, stop watering and let the plant dry out for a few days. Ensure that your soil or container has good drainage so water can escape. If the soil is not wet, yellow leaves might indicate a need for a balanced liquid fertilizer to provide essential nutrients.

Do begonias need to be cut back in the summer?

Begonias do not require heavy pruning, but pinching can help. If your plant is becoming too tall or sparse, pinching off the growing tips will encourage more side branches and a bushier shape. You can also snip off any dead or damaged leaves throughout the season to keep the plant looking its best and to improve air circulation.