Table of Contents
- Introduction
- The Different Ways Begonias Grow
- Choosing the Right Spot for Your Begonias
- How to Plant Begonia Tubers
- Watering for Healthy Growth
- Feeding and Maintenance
- Growing Begonias in Containers
- The Life Cycle: Sprout to Frost
- Troubleshooting Common Issues
- Saving Tubers for Next Year
- Why We Love Begonias
- Conclusion
- FAQ
Introduction
There is a special kind of excitement that comes with seeing the first soft, colorful sprouts of a begonia pushing through the soil. These plants are famous for their lush, tropical foliage and brilliant flowers that look like tiny roses or ruffled silk. Whether you are looking to brighten up a shady corner of your porch or add texture to your flower beds, begonias are a rewarding and accessible choice.
At Longfield Gardens, we want to make it easy for you to enjoy these stunning blooms all summer long. This guide is designed for home gardeners who want to understand the simple steps behind how begonias grow and what they need to thrive. If you are planning on tuberous types like Non Stop begonias, you can get a head start on the season with the right planting approach. We will cover the different types of begonias, how to plant them for success, and how to keep them blooming until the first frost.
Understanding the way these plants develop helps you give them the right care at the right time. Growing begonias is not a complicated task, but it does require getting a few basics right regarding light, water, and timing. By following these simple steps, you can create a vibrant, professional-looking display in your own backyard.
The Different Ways Begonias Grow
Before you start planting, it helps to know that begonias grow in a few different ways depending on their root structure. Most home gardeners work with two main types: tuberous begonias and fibrous-rooted begonias.
Tuberous begonias grow from a thick, potato-like underground stem called a tuber. These are often the stars of the show in hanging baskets and containers because they produce very large, dramatic flowers. Series like the Non-Stop or Illumination begonias are popular tuberous varieties. They go dormant in the winter and can be saved to grow again the following year.
Fibrous-rooted begonias, such as the common wax begonia, have a dense system of thin, thread-like roots. These are often used as bedding plants because they are sturdy and bloom constantly. Another popular group is the Rex begonia, which is grown primarily for its incredible, swirling leaf patterns and metallic colors. While their growth habits vary, the basic principles of care remain very similar across the genus.
Choosing the Right Spot for Your Begonias
The first rule of successful gardening is "right plant, right place." Begonias are naturally tropical plants that usually grow on the forest floor. This means they are perfectly adapted for the shady spots in your yard where other flowers might struggle.
Light Requirements
Most begonias prefer "bright shade" or filtered light. Think of the dappled sunlight that comes through the leaves of a tall tree. Direct midday sun can be a bit too intense and may cause the leaves to crisp or turn brown at the edges. However, they do need some light to produce flowers. A spot that gets gentle morning sun and afternoon shade is often the perfect balance.
Soil and Drainage
Begonias need soil that drains well. "Drainage" is simply a way of describing how fast water moves through the soil. If water sits in a puddle for a long time, the roots cannot breathe and may begin to rot.
To give your begonias the best start, use a light, high-quality potting mix if you are planting in containers. If you are planting in the ground, you can improve your soil by mixing in some compost or peat moss. This creates a fluffy texture that allows roots to spread easily while letting excess water move away.
Key Takeaway: Begonias love bright, indirect light and soil that feels like a wrung-out sponge—moist but never soggy.
How to Plant Begonia Tubers
If you are starting with tubers from Longfield Gardens, the planting process is straightforward. Because begonias are sensitive to cold, timing is more important than any special gardening "tricks."
Starting Indoors
In most parts of the United States, the growing season is not quite long enough to see blooms early if you wait to plant outside. Many gardeners start their tubers indoors about 6 to 8 weeks before the last expected frost. This gives the plants a head start so they are already leafy and strong when the weather warms up. For more step-by-step guidance, see our How to Plant and Care for Begonias guide.
The Right Way Up
One of the most common questions is which side of the tuber faces up. Begonia tubers have a slightly indented or "hollow" side. This hollow side should face up toward the sky. If you look closely, you might see small buds or "eyes" starting to peek out from that indentation.
- Fill a shallow pot or tray with moist potting soil.
- Place the tuber hollow-side up on the surface.
- Cover it with just a thin layer of soil—about 1 inch is plenty.
- Space tubers about 2 to 4 inches apart in trays, or put one tuber in a 6-inch pot.
Moving Outdoors
Wait until the soil is warm and the danger of frost has passed before moving your plants outside. Begonias are tropical, so they are happiest when nighttime temperatures stay consistently above 60°F. If a surprise cold snap is predicted, it is best to bring your containers inside or cover your garden beds temporarily.
Watering for Healthy Growth
Watering is the part of begonia care where a little bit of attention goes a long way. The goal is to keep the soil consistently moist but to avoid overwatering, which is the most common reason a plant might struggle.
The "Deep then Dry" Method
Instead of giving your plants a tiny sip of water every day, it is better to water them thoroughly and then wait for the top inch of soil to feel dry to the touch. This encourages the roots to grow deeper into the pot or garden bed, making the plant more resilient.
Where to Water
When watering, try to direct the stream at the base of the plant rather than over the leaves. Water sitting on the foliage can sometimes lead to mildew in humid weather. For tuberous begonias, try to water around the edges of the tuber rather than directly into the "hollow" center, which helps keep the main stem healthy and firm.
Containers vs. Garden Beds
Plants in containers and hanging baskets dry out much faster than those in the ground. During the heat of the summer, you may need to check your potted begonias daily. A quick way to tell if a hanging basket needs water is to lift it slightly from the bottom; if it feels very light, it is time for a deep soak.
Feeding and Maintenance
Begonias are hardworking plants that bloom continuously for months. To keep that energy up, they benefit from a little extra nutrition during the growing season.
Fertilizer Basics
You can use a balanced, water-soluble fertilizer once every two weeks. This provides the "fuel" the plant needs to produce those big, beautiful flowers. If you prefer a lower-maintenance approach, you can mix a slow-release fertilizer into the soil at planting time. This will gradually release nutrients over several months.
Deadheading for More Blooms
"Deadheading" is a gardening term that simply means removing old, faded flowers. While many modern begonias are "self-cleaning" (meaning the old flowers fall off on their own), pinching off any spent blooms or yellowing leaves keeps the plant looking tidy. It also encourages the plant to put its energy into creating new buds instead of producing seeds.
What to do next:
- Check the soil moisture every few days with your finger.
- Remove faded flowers to keep the plant looking fresh.
- Apply a liquid fertilizer every two weeks for maximum color.
- Keep an eye out for any leaves that look crowded and thin them out if needed.
Growing Begonias in Containers
Begonias are perhaps the most popular choice for containers and window boxes, and for good reason. Their mounding or cascading growth habits make them look like they were made for pots.
When planting in a container, you can space your begonias a bit closer together than you would in the ground. Spacing them about 4 to 6 inches apart creates a full, lush "bouquet" effect very quickly. Make sure your pot has at least one drainage hole at the bottom. If you have a beautiful decorative pot that doesn't have a hole, keep the begonia in a plastic nursery liner and set that inside the decorative pot. For a closer look at space planning, see our How Tall Do Wax Begonias Grow? guide.
For hanging baskets, cascading varieties like the Illumination series are spectacular. They grow stems that drape over the edges, covering the basket in a waterfall of color. Because these plants have somewhat brittle stems, place your baskets in a spot where they are protected from very strong winds.
The Life Cycle: Sprout to Frost
Knowing what to expect as your begonia grows will help you stay patient and confident.
- Weeks 1-4: After planting the tuber, you might not see much happening above the soil. The plant is busy growing roots. Keep the soil barely moist and stay patient—growth is happening where you can't see it!
- Weeks 6-8: You will see small, pink or green shoots emerging. Once these appear, the plant will grow much faster.
- Early Summer: This is when the first flowers usually appear. The plant will continue to get bushier and produce more blooms as the weather stays warm.
- Late Summer: Begonias often have a "second wind" in late summer when the nights start to cool down slightly. They will often produce their largest and most vibrant flowers during this time.
- First Frost: Begonias will continue to bloom right up until the first frost. Once the temperature drops below freezing, the foliage will turn black. This is the natural signal that the growing season has ended.
Troubleshooting Common Issues
If your begonia isn't looking its best, don't worry. Most issues are easy to fix by adjusting one or two things.
Yellow or Drooping Leaves
If the leaves are turning yellow and the soil feels very wet, the plant might be getting too much water. The fix is simple: let the soil dry out for a few days. Check that the drainage holes aren't blocked. If the leaves are wilting but the soil is dry, the plant just needs a good drink.
Crispy Brown Edges
This is usually a sign of "sunburn" or very low humidity. If your begonia is in a spot that gets hot afternoon sun, try moving the pot to a shadier location. If the air is very dry, placing pots closer together can help create a little pocket of humidity that the plants will appreciate.
Powdery Mildew
Sometimes, you might see a white, flour-like dust on the leaves. This is a common fungus called powdery mildew. It usually happens when there isn't enough air moving around the plants. You can help prevent this by spacing your plants out a little more and avoiding watering the leaves directly.
Saving Tubers for Next Year
One of the best things about tuberous begonias is that they are not a one-season wonder. You can save the tubers and plant them again next spring. This is a great way to build a bigger garden over time without extra cost.
In the fall, when the leaves begin to turn yellow and the plant looks like it is winding down, stop watering. After the first light frost kills the top of the plant, carefully dig up the tubers. Cut the stems back to about an inch above the tuber.
Let the tubers sit in a dry, cool spot for a few days until any remaining soil can be easily brushed off. Store them in a box filled with dry peat moss, sawdust, or even a simple paper bag. Keep the box in a cool, dark place (like a basement or closet) where the temperature stays around 40-50°F. Next spring, you can bring them back out and start the process all over again. If you want a quick refresher on timing, the Hardiness Zone Map can help you match planting and frost dates to your area.
Why We Love Begonias
Begonias are a staple in the garden because they provide consistent, high-impact color in areas where other flowers fail. They are a "low-effort, high-reward" plant. You don't need to be an expert to grow them, and they aren't fussy about soil pH or complicated pruning.
The variety of flower shapes—from the rose-like blooms of the Double Begonias to the unique, long petals of the Scentiment series—means there is a begonia for every style. They also have the added benefit of being relatively deer-resistant. While no plant is 100% "deer-proof," most deer tend to leave begonias alone in favor of other plants.
At Longfield Gardens, we enjoy testing these varieties in our own trial gardens to make sure they perform well for you. Whether you choose to grow them in a classic terracotta pot or a sprawling garden bed, begonias bring a sense of tropical luxury to any space. If you are planning to grow them in containers, our Shipping Information page can help you time your order.
Conclusion
How begonias grow is a journey from a simple tuber to a stunning display of color. By choosing a shady spot, ensuring good drainage, and waiting for the warm weather to arrive, you are setting yourself up for success. Gardening should be a relaxing and joyful experience, and begonias are the perfect partner for a beautiful, low-stress yard.
- Start early: Planting tubers indoors in late winter leads to earlier summer blooms.
- Watch the water: Let the top of the soil dry out between waterings to keep roots healthy.
- Feed your plants: Regular fertilizer keeps the flowers coming all season long.
- Protect from frost: Keep begonias warm and bring them in when the temperatures dip.
"Begonias are the ultimate problem-solvers for the shade. They offer a level of color and texture that is hard to find in any other plant family, making them a favorite for gardeners of all skill levels."
Ready to start your own colorful shade garden? We invite you to explore the many varieties we offer at Longfield Gardens and find the perfect match for your home. For a broader overview of begonia types and care, our What Does a Begonia Plant Look Like? guide is a helpful next step.
FAQ
How long does it take for begonias to sprout?
Begonia tubers typically take about 6 to 8 weeks to sprout once they are planted in moist soil. Because they are tropical, they may sprout faster if kept in a warm room (around 70°F). If you don't see green shoots right away, don't worry—the plant is likely focusing on growing its roots first.
Can begonias grow in full sun?
Most begonias prefer shade or partial shade, but some varieties are more sun-tolerant than others. Wax begonias, especially those with bronze-colored leaves, can often handle more sun than the large-flowered tuberous types. If you live in a very hot climate, however, even "sun-tolerant" begonias will appreciate protection from the harsh afternoon heat. For more on long-term performance, see our Are Begonias Annual or Perennial Plants? guide.
Do I need to remove the dead flowers?
While it isn't strictly necessary for the plant's health, removing dead flowers (deadheading) helps the plant look its best and encourages it to produce more buds. For tuberous begonias, simply pinch off the faded flower where it meets the stem. This prevents the plant from putting energy into seed production and keeps the focus on the blooms.
Why are my begonia leaves falling off?
If a begonia drops its leaves, it is usually a reaction to a sudden change in its environment. This could be a dramatic shift in temperature, moving the plant from a very humid spot to a dry one, or overwatering. Check the soil moisture; if it is very wet, stop watering and let the plant dry out. If the plant is new, it may just need a week or two to adjust to its new home.