Introduction
Finding the perfect splash of color for a shady corner is one of the most rewarding parts of garden planning. While many sun-loving flowers struggle in the shadows, begonias thrive, offering lush foliage and brilliant blooms that last from early summer right until the first frost. At Longfield Gardens, we love how these versatile plants can transform a quiet porch or a dim garden border into a vibrant sanctuary. Whether you are looking for the massive, rose-like flowers of tuberous begonias or the delicate, cascading stems of trailing varieties, these plants are remarkably easy to grow when you start with the right steps.
This guide will walk you through everything you need to know about how to plant begonias, from selecting the best site and preparing your soil to the specifics of depth and spacing. We will focus on helping you achieve a successful growing season, whether you are planting in garden beds or decorative containers. By following these simple methods, you can enjoy a season full of effortless beauty and healthy, vigorous plants.
With a little bit of preparation and a few basic gardening rules, anyone can grow a spectacular display of begonias.
Understanding Begonia Types
Before you get your hands in the dirt, it is helpful to know which type of begonia you are planting. While there are hundreds of species, home gardeners typically choose from a few main categories that excel in the landscape. Each type has slightly different growth habits, but the planting fundamentals remain similar. For a quick overview of the family, see our Types of Begonias.
Tuberous Begonias
These are the showstoppers of the shade garden. Grown from thickened underground stems called tubers, they produce large, dramatic flowers that can look like roses, camellias, or carnations. You can find them in upright forms for garden beds and trailing forms that are perfect for hanging baskets. They are known for their intense colors, including brilliant reds, oranges, yellows, and soft pastels.
Wax Begonias
Wax begonias are compact, fibrous-rooted plants usually grown as annuals. They have glossy, succulent-looking leaves that can be green or bronze. While the flowers are smaller than tuberous types, they are produced in great abundance. These are excellent for mass plantings and edging along walkways because they maintain a neat, mounded shape.
Rex and Foliage Begonias
While some begonias are grown for their flowers, Rex begonias are prized for their incredible leaves. These plants feature swirls of silver, purple, pink, and deep green. They are often used as "thriller" plants in containers, providing color and texture even in the deepest shade where other flowers might not bloom as heavily.
Right Plant, Right Place: Selecting the Best Site
The secret to a healthy begonia begins with its environment. These plants have a reputation for being shade-lovers, and while that is true, "shade" can mean many things. Finding the sweet spot for light and moisture will make your gardening experience much more enjoyable. If you are still deciding where begonias fit in your yard, our begonia sun or shade guide is a helpful next step.
Light Requirements
Most begonias prefer dappled sunlight or partial shade. In the garden, this usually means a spot that gets morning sun and is protected from the harsh, direct rays of the afternoon. If you live in a cooler northern climate, your begonias can handle a bit more sun. In warmer southern regions, deep shade or filtered light through a canopy of trees is best to prevent the leaves from scorching.
If you notice your begonias are growing very tall and "leggy" with few flowers, they might be reaching for more light. Conversely, if the leaves look brown and crispy at the edges, they are likely getting too much sun. A simple move to a slightly different spot can often fix these issues quickly.
Soil and Drainage
"Drainage" is a word gardeners use often, and for begonias, it simply means how fast water leaves the soil. These plants have succulent stems and tubers that store water, which makes them susceptible to rot if they sit in soggy earth for too long.
We recommend planting in soil that is light, airy, and rich in organic matter. If your garden soil feels heavy or like clay, you can easily improve it. Adding a few inches of compost or finely ground bark to the area will help create the loose structure begonias love. If you see water puddling in a spot hours after a rain, it is best to choose a different location or plant in raised beds and containers where you have more control over the soil quality.
Protection from Wind
Because begonia stems are thick and full of water, they can be a bit brittle. A heavy gust of wind can occasionally snap a stem. To keep your plants looking their best, choose a site that is somewhat sheltered. Planting near a fence, the side of a house, or among taller, sturdier perennials provides a natural windbreak that keeps your begonias safe and upright.
Key Takeaway: Begonias perform best in dappled shade with light, fertile soil that allows water to drain away easily. Protection from the hot afternoon sun and strong winds will keep the foliage and flowers looking pristine.
When to Plant Begonias
Timing is everything when it comes to tropical plants like begonias. They are very sensitive to cold, so patience is a virtue in the early spring. Before you order or plant, you can check your timing against the Hardiness Zone Map.
Outdoor Planting Timeline
You should only move your begonias outdoors once the threat of frost has completely passed. A good rule of thumb is to wait until nighttime temperatures are consistently above 50°F to 60°F. If the ground is still cold and clammy, the tubers may sit dormant or struggle to start.
In most regions, this means planting outdoors in late May or early June. If you are eager to get started, you can always check your local frost dates or use a soil thermometer. Begonias love warm soil, so waiting an extra week for the weather to stabilize often results in faster growth than planting too early.
Getting a Head Start Indoors
If you want your begonias to bloom as early as possible in the summer, you can start tuberous begonias indoors about 8 to 12 weeks before the last frost. This gives the tubers time to wake up and develop a strong root system and a few leaves before they ever touch the garden soil.
To do this, place the tubers in a shallow tray of moist potting mix in a warm room with bright, indirect light. Once the weather warms up, you can transition them to their permanent homes outside. This extra step is especially helpful for gardeners in northern states with shorter growing seasons.
Preparing the Soil for Success
Good soil prep is like laying a strong foundation for a house. It ensures your plants have the nutrients and physical environment they need to grow.
- Loosen the ground: Use a garden fork or spade to loosen the soil to a depth of about 6 to 8 inches. This makes it easier for the delicate roots to spread.
- Add organic matter: Mix in a 2-inch layer of compost. Compost improves drainage in clay soil and helps sandy soil hold onto the right amount of moisture.
- Skip the heavy mulch: While many plants love a thick layer of wood chips, begonias prefer to breathe. Keep mulch away from the base of the stems to prevent moisture from building up against the plant, which can lead to rot.
How to Plant Begonia Tubers: Step-by-Step
Planting tubers is a unique experience compared to planting seeds or nursery starts. Once you understand the anatomy of a begonia tuber, the process is very straightforward.
Identifying the Top and Bottom
When you look at a begonia tuber, you will notice that one side is slightly indented or concave, like a shallow bowl. This "hollow" side is the top. This is where the sprouts will eventually emerge. The rounded, smoother side is the bottom, where the roots will grow.
Planting Depth and Spacing
Getting the depth right is one of the "quiet winners" of begonia gardening.
- Dig a shallow hole: For garden beds, the hole only needs to be deep enough so the tuber is just barely covered with soil.
- Place the tuber: Set the tuber into the hole with the indented (hollow) side facing up.
- Cover lightly: Fill in the hole so that only about 1/2 inch to 1 inch of soil covers the top of the tuber. If you are starting them in trays indoors, you can even leave the very tops of the tubers exposed until they start to sprout.
- Space them out: Give your plants room to breathe and grow. Space tuberous begonias about 8 to 12 inches apart. This ensures good airflow around the leaves, which helps prevent common issues like powdery mildew.
Initial Watering
After planting, give the area a gentle but thorough watering. This helps settle the soil around the tuber and removes any large air pockets. After this initial watering, hold off on watering again until you see the first signs of green growth poking through the soil. Overwatering a dormant tuber can cause it to rot before it has a chance to grow.
What to do next:
- Identify the indented "top" of the tuber.
- Space holes 10 inches apart in a shady spot.
- Plant so the tuber is covered by just 1/2 inch of soil.
- Water once and wait for the first sprouts to appear.
Planting Begonias in Containers
Begonias are perhaps the most popular choice for containers, window boxes, and hanging baskets. They provide a high-impact look with very little effort, and containers allow you to move the plants around to find the perfect light levels. For basket ideas, take a look at our Hanging Begonias collection.
Choosing the Right Pot
Always ensure your container has drainage holes at the bottom. If you fall in love with a decorative pot that doesn't have holes, use it as a "cachepot"—keep the begonia in a plain plastic nursery liner with holes and set that inside the decorative one. This allows you to lift the plant out to water it or let excess water drain away.
For a single tuber, a 6-inch pot is usually sufficient. If you want a full, lush look in a larger 12-inch patio planter, you can plant three tubers together. For a fuller display, our Non Stop Begonias are a great option to browse.
Using Potting Mix
Never use garden soil in a container. It is too heavy and will pack down, suffocating the roots. Instead, use a high-quality, all-purpose potting mix. These mixes are usually "soilless," consisting of peat moss, perlite, or vermiculite, which provides the perfect balance of moisture retention and aeration.
The "Thriller, Filler, Spiller" Technique
Begonias fit perfectly into the classic container design rule:
- Thriller: Use an upright, large-flowered tuberous begonia or a colorful Rex begonia as the center focal point.
- Filler: Surround the center with lower-growing wax begonias or other shade-loving plants like coleus.
- Spiller: Plant trailing begonias or "Illumination" varieties near the edges of the pot so they can cascade over the sides.
Ongoing Care and Maintenance
Once your begonias are established and growing, they require very little "work." Most of their care involves simply monitoring the moisture and enjoying the show.
Watering Correctly
The goal with begonias is to keep the soil "evenly moist." Imagine a sponge that has been wrung out—that is the level of moisture you are looking for.
- Check before you water: Stick your finger about an inch into the soil. If it feels dry, it is time to water. If it still feels damp, wait a day or two.
- Water the soil, not the leaves: Try to direct the water at the base of the plant. Wetting the foliage frequently can encourage fungal diseases.
- Morning is best: Watering in the morning allows any accidental splashes on the leaves to dry out during the day.
Fertilizing for Better Blooms
Begonias are heavy feeders because they produce so many flowers over a long season. Starting a few weeks after the first leaves appear, you can begin using a balanced, water-soluble fertilizer.
Applying fertilizer at half-strength every two weeks is often better than one full-strength dose once a month. This provides a steady stream of nutrients to keep the plant vigorous. If you prefer a more "set it and forget it" approach, you can mix a slow-release granular fertilizer into the soil at planting time.
To Deadhead or Not?
Many modern begonia varieties are "self-cleaning," meaning the old flowers fall off on their own as they fade. However, if you see spent blooms or yellowing leaves staying on the plant, it is a good practice to gently pinch them off. This keeps the plant looking tidy and encourages it to put more energy into new flowers rather than seed production.
Caring for Begonias through the Seasons
As the season progresses, your begonias will continue to grow and fill out. Because we want gardening to be a rewarding activity, it is helpful to know what to expect as the weather changes.
Mid-Summer Growth
In the heat of mid-summer, your begonias might need water more frequently, especially if they are in hanging baskets. Small containers can dry out quickly in the wind. If your plant looks a little wilted in the afternoon heat but the soil is damp, don't rush to water it—it might just be reacting to the temperature. If it is still wilted the next morning, it definitely needs a drink.
The End of the Season
As the days get shorter and temperatures drop in the fall, begonias will naturally start to slow down. The leaves may begin to yellow, which is the plant’s way of preparing for dormancy.
In USDA zones 9 through 11, begonias can often stay in the ground year-round. In colder zones (zones 3–8), they are treated as annuals. However, because they grow from tubers, you can actually save them to plant again next year!
Storing Tubers for Next Year
If you want to keep your favorite varieties, wait until the foliage has been touched by a light frost or has turned yellow.
- Lift the tubers: Carefully dig up the tubers, keeping the soil attached.
- Dry them out: Place them in a cool, dry, frost-free area (like a garage or basement) for a few weeks until the stems fall off naturally.
- Clean and store: Shake off the excess soil and store the tubers in a box filled with peat moss, sawdust, or even crumpled newspaper. Keep them in a cool (40-50°F), dark place until next spring.
Companion Plants for Begonias
Begonias look wonderful on their own, but they truly shine when paired with other shade-loving plants. Mixing textures and heights can make your garden look professionally designed. If you want more pairing ideas, our begonia companion guide is a useful reference.
- For Texture: Pair the bold flowers of tuberous begonias with the airy fronds of ferns or the heart-shaped leaves of hostas.
- For Color Contrast: Use the silver-patterned leaves of Rex begonias to make the deep greens of other plants "pop."
- For Continuous Bloom: Combine begonias with fuchsias or impatiens. They all enjoy similar light and water conditions, ensuring your shade garden stays colorful all season long.
- For Foliage Interest: Caladiums and coleus offer a wide range of colors that complement the jewel tones of begonia flowers perfectly.
Success with Begonias: Realistic Expectations
While we want every garden to be perfect, nature always has its own plans. It is important to remember that gardening is a partnership with the environment.
The speed at which your begonias grow will depend heavily on the local weather. If you have a particularly cool, cloudy spring, your tubers may take a few extra weeks to wake up. This is perfectly normal and not a sign of failure. Similarly, if a sudden heatwave hits, your plants might take a "break" from blooming for a week or two. Once the weather settles, they will get right back to work.
We maintain trial gardens to evaluate how our plants perform in real-world conditions, and we find that begonias are among the most resilient and forgiving plants for home gardeners. They are generally not bothered by many pests, and their primary "demand" is simply well-drained soil and a break from the scorching sun.
Key Takeaway: Consistent, moderate care is the secret to begonia success. Deep watering followed by a short drying period, regular feeding, and a protected location will yield the best results.
Conclusion
Planting begonias is one of the easiest ways to bring high-impact color and elegance to the shaded parts of your landscape. By choosing the right spot with dappled light, ensuring your soil drains well, and planting your tubers at the proper depth, you are setting yourself up for a season of success. At Longfield Gardens, we take pride in providing high-quality tubers and plants that help you achieve these beautiful results with confidence.
Gardening should be a source of joy and relaxation. Whether you are planting a single pot for your front steps or a whole border of cascading blooms, the process is straightforward and the rewards are immense. We are here to support you every step of the way with practical advice and quality plants. If you want to learn more about the company behind the plants, visit our 100% Quality Guarantee.
- Wait for warm weather (nights above 50°F) before planting outdoors.
- Plant tubers with the indented side facing up, just below the soil surface.
- Water only when the top inch of soil feels dry.
- Enjoy the nonstop color from summer until the first frost.
"The beauty of begonias lies in their versatility. From the smallest window box to the grandest garden bed, they offer a reliable and stunning display that truly makes a house feel like a home."
Ready to start your shade garden? Visit us at Longfield Gardens to find the perfect varieties for your space and let us help you grow a garden you'll love. Before ordering, check the Shipping Information page so you know what to expect by zone.
FAQ
How deep should I plant begonia tubers?
Begonia tubers should be planted quite shallowly. Dig a hole so that the tuber is covered by only about 1/2 inch to 1 inch of soil. If you plant them too deep, they may struggle to send shoots to the surface or could stay too wet and rot.
Which way is "up" on a begonia tuber?
Look for a side that is slightly indented or bowl-shaped; this concave side should face upward. The rounded, smoother side is the bottom. Sometimes you might even see tiny pink or green "eyes" (buds) starting to grow in the indented side—those are your definite signs of the top!
Do begonias need full shade or can they take some sun?
Most begonias prefer "partial shade," which means about 4 to 6 hours of light, ideally in the morning. They need some light to produce flowers, but the hot, direct afternoon sun can burn their leaves. Varieties with darker or bronze foliage can generally handle more sun than those with bright green leaves.
How often should I water my begonias?
There is no set schedule, as it depends on your weather and soil. The best method is to check the soil with your finger. If the top inch feels dry, give them a good soak. If it is still moist, wait. Begonias prefer to be "evenly moist"—never bone-dry, but never sitting in a puddle.
