Table of Contents
- Introduction
- Understanding Different Types of Begonias
- Choosing the Perfect Planting Site
- When to Plant Your Begonias
- How to Plant Tuberous Begonias
- Watering and Fertilizing for Success
- Routine Maintenance: Deadheading and Pruning
- Overwintering: Saving Your Begonia Tubers
- Common Challenges and Easy Wins
- Companion Plants for Begonias
- Conclusion
- FAQ
Introduction
There is something truly magical about watching a shaded corner of the garden come to life with the vivid colors of begonias. While many flowering plants demand hours of intense, direct sunlight, begonias thrive in those quiet, cool spaces where other plants might struggle. Their lush foliage and ruffled, rose-like flowers provide a tropical feel that lasts from the first warm days of summer all the way until the first frost of autumn.
Whether you want to brighten up a covered porch with hanging baskets or add a splash of color beneath a leafy canopy, we are here to help. This begonia growing guide covers everything from choosing the right site to storing your tubers for next year. At Longfield Gardens, we want to make sure your gardening experience is as rewarding as it is beautiful. For a broader overview of types and care, see our All About Begonias guide.
This guide is designed for home gardeners of all skill levels who want to master the art of growing these versatile plants. By focusing on a few simple basics like drainage and timing, you can enjoy professional-looking results in your own backyard. Growing begonias is one of the easiest ways to bring consistent, high-impact color to the shadier parts of your landscape. If you are just getting started, our How Deep Should I Plant Begonias? guide is a helpful next step.
Understanding Different Types of Begonias
Before you get your hands in the dirt, it is helpful to know which type of begonia you are growing. While there are thousands of varieties, most home gardeners encounter four main groups. Each has its own personality and preferences.
Tuberous Begonias
These are the stars of the summer shade garden and the primary focus of this guide. They grow from a thick, potato-like underground structure called a tuber. Tuberous begonias are famous for their large, spectacular flowers that look like roses or camellias. They come in two main forms: upright varieties for garden beds and pots, and trailing varieties that spill beautifully out of hanging baskets. For more inspiration, browse the Begonia Flower Bulbs for Sale page.
Wax Begonias
You often see these in public parks or as edging for flower beds. They have small, succulent-like leaves that are either green or bronze. Wax begonias are incredibly tough and can handle more sun than their tuberous cousins. They produce clusters of small flowers in white, pink, or red and keep blooming even in high heat.
Rex Begonias
If you love interesting textures and colors, Rex begonias are for you. These are grown mainly for their foliage rather than their flowers. Their leaves can feature swirls of silver, purple, pink, and deep green. While they are often kept as houseplants, they make excellent additions to shaded outdoor containers during the summer.
Cane Begonias
Commonly known as "Angel Wing" begonias, these plants have long, upright stems with joints that look like bamboo. They have attractive, spotted leaves and produce drooping clusters of flowers. These are very popular as indoor plants but can be moved outside to a shaded patio once the weather is warm.
Key Takeaway: Identify whether your begonia is tuberous (large flowers, grows from a tuber) or another type. This helps you determine the best planting depth and care routine.
Choosing the Perfect Planting Site
The secret to a happy begonia is matching the plant to the right environment. In the gardening world, we often call this "right plant, right place." For begonias, this means finding a spot that balances light and protection. Our Where to Plant Begonias: Sun or Shade? guide goes deeper into placement.
Light Requirements
Most begonias prefer "dappled" or "filtered" light. Imagine the way sunlight looks when it filters through the leaves of a tall tree—that is the ideal setting. While they love brightness, the intense heat of the afternoon sun can scorch their tender leaves and cause flowers to wilt.
If you live in a cooler northern climate, your begonias may tolerate a bit more morning sun. However, in the hot southern states, deep shade during the afternoon is a must. A north-facing or east-facing porch is usually a perfect location for potted varieties.
Soil and Drainage
"Drainage" is a word gardeners use to describe how quickly water moves through the soil. Begonias have very sensitive stems and roots that do not like to sit in soggy earth. If the soil stays too wet for too long, the plant can suffer from rot.
To check your drainage, watch your garden after a heavy rain. If puddles remain after five or six hours, the soil is likely too heavy in clay. You can improve this by adding organic matter like compost or finely ground bark. For containers, always use a high-quality potting mix rather than garden soil, as it is designed to let air and water move freely.
Space to Breathe
Airflow is an often-overlooked part of begonia care. These plants thrive when they have a little room for air to circulate around their leaves. This helps prevent common fungal issues like powdery mildew. Avoid crowding your plants too tightly together; leaving about 10 to 12 inches between them is a great rule of thumb.
When to Plant Your Begonias
Begonias are tropical plants at heart. They love warmth and have no tolerance for frost. This means timing is everything when it comes to planting. If you need help checking timing, use our Hardiness Zone Map and Shipping Information pages.
Following the Calendar
In most parts of the United States, you should wait until the soil has warmed up and the danger of frost has completely passed before moving begonias outside. A good indicator is the nighttime temperature. Once the nights stay consistently above 60°F, it is safe for your begonias to take up residence in the garden.
Starting Early Indoors
If you want to see flowers earlier in the summer, you can "pre-start" your tuberous begonias indoors. About 8 to 12 weeks before the last expected frost, you can plant the tubers in small pots or a shallow tray. Keep them in a warm, bright spot inside your home. By the time the weather is warm enough to move them outside, you will already have established plants ready to bloom.
Watching the Weather
Nature does not always follow a strict calendar. If an unseasonably cold night is predicted after you have planted your begonias, it is a good idea to protect them. For plants in pots, simply move them into a garage or shed for the night. For plants in the ground, a light frost blanket or an old sheet can provide the necessary warmth.
What to do next:
- Check your local "last frost date" online.
- Monitor your nighttime temperatures for a week.
- If you are starting early, set up a warm spot near a window for your indoor pots.
How to Plant Tuberous Begonias
Planting tuberous begonias is a simple process, but there is one specific trick you need to know: which side is up.
Identifying the Top
When you look at a begonia tuber, you will notice that one side is slightly indented or "hollowed out" like a small bowl. This is the top. The sprouts will emerge from this indentation. The rounded, smoother side is the bottom, where the roots will grow.
Proper Planting Depth
Depth is a quiet winner in the garden. For tuberous begonias, you do not need to dig a deep hole. Simply tuck the tuber into the soil so it is covered by only about one inch of earth. If you are planting in a very wet climate, some gardeners set the tuber at a slight angle. This prevents water from pooling in the center "bowl" of the tuber, which helps prevent rot.
Spacing and Placement
If you are planting in a garden bed, space the tubers 10 to 12 inches apart. This gives the plants plenty of room to fill out without competing for nutrients. For containers, you can place them a bit closer—about 4 to 6 inches apart—to create a full, lush look more quickly.
Initial Watering
After planting, give the soil a light watering to help it settle around the tuber. However, do not keep the soil soaking wet during this early stage. The tuber is still "waking up" and doesn't need much moisture until the first green sprouts appear above the soil.
Watering and Fertilizing for Success
Once your begonias are growing and blooming, they need consistent care to stay vibrant. They are relatively low-maintenance, but they do have a few specific preferences for food and water.
The "Deep and Dry" Rule
The best way to water begonias is to do it deeply and then let the soil dry out slightly before watering again. Stick your finger about an inch into the soil; if it feels dry, it is time to water.
When you water, try to aim for the base of the plant rather than the leaves. Wet leaves can lead to fungal spots or mildew, especially if the water sits on the foliage overnight. Watering in the morning is ideal, as it allows any accidental splashes to dry in the daylight.
Feeding Your Plants
Begonias are "heavy feeders," which means they use a lot of energy to produce those constant blooms. To keep them going all summer, they appreciate a regular supply of nutrients.
Start with a balanced, all-purpose liquid fertilizer once the plant is well-established with several sets of leaves. Many gardeners find success by applying fertilizer at half-strength every two weeks. This provides a steady stream of "food" without overwhelming the plant. Always follow the instructions on the fertilizer label for the best results.
Adjusting for Containers
Plants in pots and hanging baskets dry out much faster than those in the ground. During the peak of summer heat, you may need to check your potted begonias every day. Because you are watering more frequently, nutrients also wash out of the soil faster, so consistent fertilizing is even more important for container displays.
Key Takeaway: Water when the top inch of soil feels dry and feed with a balanced fertilizer every two weeks for a nonstop flower show.
Routine Maintenance: Deadheading and Pruning
Begonias are naturally tidy plants, but a little bit of "grooming" goes a long way in keeping them looking their best.
To Deadhead or Not?
"Deadheading" is the process of removing faded or spent flowers. Many modern begonia varieties are "self-cleaning," meaning the old flowers fall off on their own. However, if you see wilted blooms clinging to the stems, it is a good idea to pinch them off. This prevents the plant from spending energy on seed production and encourages it to grow more flowers instead.
Managing Growth
Sometimes, begonias can become a bit "leggy," which means the stems grow long and sparse. If this happens, do not be afraid to pinch back the tips of the stems. This encourages the plant to branch out and become bushier. It might feel like you are losing a few leaves now, but the result will be a much fuller and more attractive plant in a few weeks.
Removing Damaged Foliage
Throughout the season, you might notice a yellow leaf or a snapped stem. Simply snip these off with a clean pair of scissors. Keeping the plant clear of debris helps improve airflow and keeps the focus on the healthy, beautiful parts of the display.
Overwintering: Saving Your Begonia Tubers
In most parts of the United States, begonias are treated as annuals because they cannot survive the winter. However, the beauty of tuberous begonias is that you can save the tubers and replant them year after year.
The Curing Process
When the weather begins to cool in the fall, your begonia will naturally start to slow down. The leaves may begin to turn yellow. This is a sign that the plant is moving its energy down into the tuber for storage. After the first very light frost (or when the foliage looks tired), dig up the tubers carefully.
Cut the stems back to about an inch or two above the tuber. Lay the tubers in a warm, dry, and shaded place for about two weeks. This is called "curing." It allows the outer skin of the tuber to toughen up, which helps it survive storage.
Winter Storage
Once cured, gently brush off any remaining dry soil. Store the tubers in a cool, dark, and dry place where temperatures stay around 50°F. A basement or a cool closet works well. To keep them from drying out completely, many gardeners tuck them into a box filled with peat moss, sawdust, or shredded paper.
Spring Reawakening
When spring returns, check your tubers. They should still feel firm, like a fresh potato. If they are soft or shriveled, they may not grow. If they are healthy, you can start the planting process all over again, enjoying even larger plants as the tubers grow bigger each year.
What to do next:
- Watch for yellowing leaves in late autumn.
- Prepare a small box and some peat moss for storage.
- Label your tubers so you remember which colors are which next spring!
Common Challenges and Easy Wins
Even the most successful gardeners run into a few hiccups. The good news is that begonia issues are usually easy to solve with simple changes to your routine. If you want more background on plant quality and support, see our About Us and our guarantee pages.
Powdery Mildew
This looks like a light dusting of white flour on the leaves. It usually happens when the air is humid and the plants are too crowded.
- The Fix: Increase the space between your plants and try to keep the leaves dry when watering.
Dropping Buds
If your begonia is dropping its flower buds before they open, it is usually a sign of stress. This can be caused by extreme heat, too much water, or not enough light.
- The Fix: Check the soil moisture. If it is soggy, let it dry out. If the plant is in a very hot spot, try moving it to a cooler, shadier location.
Yellow Leaves
Yellowing leaves are the plant's way of saying it is unhappy with its water levels.
- The Fix: Use the finger test. If the soil is wet, you are watering too much. If it is bone-dry and pulling away from the edges of the pot, you need to water more frequently.
Small Flowers
If your plant looks healthy but the flowers are small or few, it might be hungry.
- The Fix: Start a regular fertilizing schedule. A little bit of food every two weeks can make a massive difference in bloom size and quantity.
Companion Plants for Begonias
Begonias look wonderful on their own, but they also play well with others. When choosing companions, look for plants that share the same love for shade and well-drained soil.
- Hostas: These are the kings of the shade garden. Their broad, textured leaves provide a perfect backdrop for the bright colors of begonia flowers.
- Ferns: The delicate, airy fronds of ferns create a beautiful contrast with the bold, waxy leaves of begonias.
- Coleus: Available in almost every color imaginable, coleus is grown for its vibrant foliage. Pairing a lime-green coleus with a red begonia creates a high-contrast look that pops in the shade.
- Caladiums: These plants have heart-shaped leaves with incredible patterns. They love the same warm, humid conditions that begonias enjoy.
Conclusion
Growing begonias is a rewarding journey that brings light and life to the shaded parts of your yard. By choosing the right location, ensuring good drainage, and being patient with the spring weather, you can create a stunning display that lasts all summer long. These plants are a testament to the fact that you don't need a sun-drenched field to have a breathtaking garden.
At Longfield Gardens, we believe that every gardener deserves a beautiful outdoor space. Whether you are planting a single pot on a balcony or filling a long garden border, begonias are a reliable and spectacular choice. We hope this guide has given you the confidence to start your own begonia collection this season.
- Wait for warm weather before planting outside.
- Prioritize well-drained soil to protect the tubers.
- Feed your plants regularly for the best flower show.
Gardening is an ongoing conversation with nature. Take the time to observe your plants, enjoy their progress, and celebrate every bloom that brightens your day.
FAQ
Can begonias grow in full sun?
Most begonias prefer partial shade or filtered sunlight, especially in hot climates. Wax begonias are the most sun-tolerant variety and can handle more direct light if they are kept well-watered. However, for tuberous begonias, afternoon sun is usually too intense and can scorch the leaves.
How often should I water my begonias?
You should water your begonias whenever the top inch of soil feels dry to the touch. This might be every few days for plants in the ground or every day for plants in hanging baskets during hot weather. Always check the soil first to avoid overwatering, as begonias do not like "soggy feet."
Why are my begonia leaves turning yellow?
Yellow leaves are usually a sign of a watering issue. It can happen if the soil is staying too wet, which causes the roots to struggle, or if the plant has become completely dried out. Check the drainage of your pot or garden bed and adjust your watering schedule to keep the soil consistently moist but not saturated.
Do I need to dig up my begonias for the winter?
In USDA zones 8 and colder, tuberous begonias will not survive the winter outdoors. You should dig up the tubers after the first light frost, let them dry or "cure" for two weeks, and then store them in a cool, dry place until spring. Wax begonias are typically treated as annuals and replaced each year. For more timing help, visit the Hardiness Zone Map and Shipping Information pages.