Table of Contents
- Introduction
- Understanding Your Begonia Type
- Finding the Right Place to Plant
- Timing Your Planting
- How to Plant Tuberous Begonias
- Begonia Growing Instructions for Containers
- Essential Care and Maintenance
- Troubleshooting Common Begonia Questions
- Overwintering Begonia Tubers
- Safety and Pets
- Conclusion
- FAQ
Introduction
There is a unique kind of excitement that comes with seeing the first soft, ruffled petals of a begonia unfurl in a shaded corner of the garden. These plants are beloved for their ability to bring vibrant, tropical color to the spots where many other flowers struggle to grow. Whether you are looking for the massive, rose-like blooms of tuberous begonias or the striking, metallic patterns of rex foliage, begonias offer a rewarding experience for every level of gardener. At Longfield Gardens, we want to help you transform your outdoor spaces into lush retreats with these versatile plants.
This guide provides clear, practical begonia growing instructions to help you succeed from the moment you receive your plants or tubers. We will cover everything from selecting the right variety for your light conditions to the specific steps for planting, watering, and maintaining your begonias throughout the season. For a quick reference on timing, it also helps to check your hardiness zone before you plant.
Our goal is to make gardening feel accessible and enjoyable. By matching the needs of your begonias to the conditions in your yard, you set the stage for a thriving garden.
Understanding Your Begonia Type
Before you start digging, it is helpful to know which type of begonia you are growing, as their needs can vary slightly. Most home gardeners focus on a few popular categories, each offering different benefits for the landscape or patio.
Tuberous Begonias
These are the showstoppers of the shade garden. They grow from thickened, potato-like underground stems called tubers. Tuberous begonias are famous for their large, high-petal-count flowers that look remarkably like roses or camellias. They are excellent for hanging baskets, window boxes, and shaded garden beds. If you want a ready-made display for containers, browse our Hanging Begonias.
Wax Begonias
Often used as bedding plants, wax begonias have waxy, succulent-like leaves and small, prolific flowers in shades of red, white, and pink. They are quite sturdy and can handle more sunlight than many other varieties. These are a great choice for borders where you want consistent, low-maintenance color.
Rex and Rhizomatous Begonias
These varieties are primarily grown for their incredible foliage. Their leaves feature swirls, spots, and stripes in colors like silver, burgundy, purple, and forest green. While they do produce small flowers, the primary "instruction" for these is to provide the bright, indirect light they need to keep their colors vibrant.
Cane Begonias
Known for their upright, bamboo-like stems, cane begonias (including the popular "Angel Wing" types) can grow quite tall. They often feature spotted leaves and clusters of drooping flowers. They work well as focal points in large containers. If you prefer a fuller upright look, take a look at Upright Double Begonias.
Finding the Right Place to Plant
Success with begonias begins with "right plant, right place." Begonias are native to tropical and subtropical regions, which means they appreciate warmth, moisture, and protection from the harsh afternoon sun. Before you plant, it is also worth checking Longfield Gardens' shipping information so your order arrives in the right season for your zone.
Sunlight Requirements
Most begonias prefer filtered light or partial shade. In the garden, the ideal spot is one that receives gentle morning sun and is shaded during the hottest part of the afternoon. If you notice the leaves of your begonia looking scorched or turning brown at the edges, it may be getting too much direct light. Conversely, if the plant becomes "leggy"—meaning it has long, weak stems with few flowers—it is likely reaching for more light.
Soil and Drainage
The word "drainage" simply refers to how fast water leaves the soil. Begonias have fleshy stems and roots that store water, making them susceptible to rot if they sit in soggy earth. They prefer light, fertile soil that stays moist but never stays saturated. For more planting detail, see our guide on how deep to plant begonias.
If your garden soil feels heavy or holds water for a long time after a rain, you can improve the area by mixing in organic material like compost or finely ground bark. For container gardening, always use a high-quality, well-draining potting mix rather than garden soil, which is too heavy for pots.
Air Circulation
While begonias love humidity, they also need a little breathing room. Providing space between plants helps air move freely, which keeps the foliage dry and healthy. This is a simple way to prevent common issues like powdery mildew without needing extra tools or treatments.
Key Takeaway: Match your begonias to a spot with filtered light and soil that drains well. Protection from the hot afternoon sun is the most important factor for preventing leaf scorch.
Timing Your Planting
When it comes to begonias, timing beats tricks every time. Because these are tropical plants, they are very sensitive to cold temperatures.
Wait for the Warmth
In most regions, the best time to plant begonias outdoors is in late spring, well after the danger of frost has passed. A good rule of thumb is to wait until nighttime temperatures are consistently above 60°F. If the soil is too cold, the tubers or roots may sit dormant and risk rotting before they even begin to grow.
Starting Early Indoors
If you live in a northern climate with a short growing season, you can give tuberous begonias a head start. About 8 to 12 weeks before your last expected frost, you can start tubers indoors in pots. Place them in a warm, bright spot to encourage early sprouting. This way, when the weather finally warms up, you will have established plants ready to go into the garden.
How to Plant Tuberous Begonias
Tuberous begonias are a specialty for us, and they are one of the most rewarding plants to grow from scratch. Getting the depth and orientation right is the "quiet winner" for a successful start.
Step 1: Identify the Top
Look at your begonia tuber. One side will have a slight indentation or "hollow" (like a shallow bowl). This is the top, where the new stems will emerge. The rounded, smoother side is the bottom, where the roots will grow.
Step 2: Dig and Place
For garden planting, loosen the soil and dig a shallow hole. Place the tuber into the hole with the indented side facing up. If you live in an area that gets a lot of rain in the spring, you can tilt the tuber slightly so water doesn't sit in the center of the hollow, which helps prevent rot.
Step 3: Depth and Spacing
Cover the tuber with about 1/2 to 1 inch of soil. If you plant them too deep, they may struggle to push their stems through the surface. Space your tubers about 8 to 12 inches apart to allow them room to spread out as they grow. For a more detailed look at spacing, see our article on how far apart to plant begonias.
Step 4: Initial Watering
Water the area lightly after planting to settle the soil. Then, hold off on frequent watering until you see the first green sprouts emerge. This usually takes about 2 to 4 weeks, depending on the temperature.
Begonia Growing Instructions for Containers
Begonias are among the best plants for containers because they provide full, lush growth that can spill beautifully over the edges of a pot.
Choosing a Container
Ensure your pot, hanging basket, or window box has at least one drainage hole in the bottom. Begonias do not like "wet feet," so that hole is essential for letting excess water escape. For a matching container-friendly option, Begonia Hanging Pink Balcony is a useful example.
Planting in Pots
- Fill the pot: Use a fresh potting mix, leaving about 2 inches of space below the rim.
- Position the tubers: For a 12-inch pot, you can plant two or three tubers for a very full look. Space them about 4 to 6 inches apart.
- Cover lightly: Just like in the garden, cover the tubers with 1/2 to 1 inch of potting mix.
- Placement: Place the container in a warm, bright spot that is protected from wind and direct midday sun.
What to Do Next
- Check the soil daily during the first few weeks; it should feel like a wrung-out sponge—damp but not dripping.
- Once sprouts are 2 or 3 inches tall, move the container to its permanent summer location.
- Start a regular feeding schedule once the plant has several sets of leaves. For bulk planting, the Begonia Non Stop Mix is a strong choice.
Essential Care and Maintenance
Once your begonias are established and growing, they are relatively self-sufficient. However, a little consistent care will keep them blooming at their peak from midsummer right through the first frost.
Watering Correctly, Not Constantly
The most common mistake with begonias is watering too often. It is better to water deeply and then let the top inch of soil dry out before watering again.
When you water, try to aim the stream at the base of the plant rather than over the leaves. Wet foliage can sometimes lead to spotting or fungal issues, especially if the air is very still. If you are growing begonias in hanging baskets, they will dry out much faster than those in the ground, so you may need to check them every morning during the heat of summer.
Feeding Your Plants
Begonias are "heavy feeders," meaning they use a lot of energy to produce those constant blooms. To keep them going, use a balanced liquid fertilizer about every two to three weeks. If you prefer, you can use a slow-release granular fertilizer at planting time, following the instructions on the package. Look for a fertilizer that is formulated for flowering plants, as this will encourage more blooms rather than just green leaves.
Deadheading and Grooming
"Deadheading" is the practice of removing faded flowers. Most modern begonias are "self-cleaning," meaning the old flowers will fall off on their own. However, removing spent blooms and any yellowing leaves by hand will keep the plant looking tidy and can encourage the plant to put more energy into new flowers.
Handling Leggy Stems
If your begonia starts to look a bit sparse or the stems are getting too long and flopping over, don't be afraid to give them a quick trim. Pinching back the tips of the stems will encourage the plant to branch out, resulting in a fuller, bushier shape.
Key Takeaway: Water deeply when the soil surface feels dry, and provide regular fertilizer to fuel continuous blooming throughout the summer.
Troubleshooting Common Begonia Questions
If your begonias aren't performing as expected, the solution is usually found in one of the basics: light, water, or temperature.
Why are the leaves turning yellow?
This is often a sign of overwatering. If the soil feels very wet, stop watering and let it dry out significantly. If the yellowing is accompanied by a "mushy" feeling at the base of the stem, the plant may be experiencing rot. In this case, move it to a drier spot and ensure the drainage holes aren't blocked.
Why are the flower buds falling off?
Begonias may drop their buds if they are stressed. Common stressors include extreme heat, very dry soil, or a sudden change in light. Ensure your plant is in a shaded spot during heatwaves and keep the moisture levels consistent.
Why is there a white powder on the leaves?
This is likely powdery mildew, a common fungus that appears when air circulation is low or the humidity is very high. To resolve this, increase the spacing between your plants and avoid getting water on the leaves when you garden. In many cases, the plant will grow out of it as weather conditions change.
Why isn't my begonia blooming?
The most likely cause for a lack of flowers is not enough light. While begonias love shade, they still need "bright" shade. If your plant is under a very dense tree canopy or on a dark porch, move it to a spot that gets more reflected light or gentle morning sun.
Overwintering Begonia Tubers
Because begonias are tropical, they will not survive a freezing winter in most of the United States (Zones 3-8). However, you don't have to start over every year! You can save your tubers and plant them again next spring. If you want to check your local conditions again, revisit the hardiness zone map.
- Watch the weather: After the first light frost kills the foliage, or when the leaves start to turn yellow in autumn, stop watering the plants.
- Lift the tubers: Carefully dig up the tubers from the ground or remove them from their pots.
- Clean and dry: Cut off the stems about an inch above the tuber. Let the tubers sit in a dry, protected place (like a garage or basement) for a few days until they are dry to the touch.
- Store safely: Place the tubers in a box filled with peat moss, sawdust, or even just wrapped in newspaper.
- Keep them cool: Store the box in a dark, cool spot that stays between 40°F and 50°F. A basement or a cool closet is usually perfect. Check on them once or twice during the winter to make sure they aren't shriveling up or getting moldy.
In the spring, when the weather warms up again, your tubers will be ready to start the cycle all over.
Safety and Pets
It is important to note that begonias contain calcium oxalates, which can be toxic to pets if eaten. The tubers contain the highest concentration of these compounds. If you have curious dogs or cats, it is best to plant your begonias in raised beds, hanging baskets, or other areas that are out of their reach. Always wash your hands after handling tubers or plant debris to avoid any skin irritation.
Conclusion
Growing begonias is one of the easiest ways to bring high-impact color to the shadier parts of your landscape. By following these simple begonia growing instructions—focusing on warm planting temperatures, well-drained soil, and consistent feeding—you can create a stunning display that lasts all summer long.
At Longfield Gardens, we take pride in providing high-quality tubers and plants that are true to variety and ready to thrive in your garden. We stand behind our products with a 100% quality guarantee because we want your gardening experience to be as rewarding as possible. Whether you are planting a single pot for your porch or a long border in your backyard, begonias are a wonderful choice for any home.
- Wait for warm nights (60°F+) before moving begonias outside.
- Plant tubers with the hollow side facing up, just below the soil surface.
- Provide bright, indirect light and avoid soggy soil.
- Feed every 2–3 weeks with a balanced fertilizer for the best blooms.
Key Takeaway: Begonias are resilient, beautiful plants that flourish when given warmth, filtered light, and a bit of room to breathe.
If you’re ready to start your own shade garden retreat, browse our Begonia Flower Bulbs for Sale and find the perfect colors for your home today.
FAQ
Can begonias grow in full sun?
Most begonias prefer partial shade or filtered light, especially in hot climates. However, wax begonias are much more tolerant of sun and can thrive in full-sun locations if they are kept well-watered. For tuberous begonias, it is best to provide protection from the intense afternoon sun to prevent the leaves and flowers from wilting or scorching. For more planting guidance, see our begonia planting depth guide.
How often should I water my begonias?
There is no set schedule for watering, as it depends on your local weather and whether the plants are in pots or the ground. The best method is to check the soil with your finger; if the top inch feels dry, it is time to water. In the heat of summer, containers and hanging baskets may need water every day, while garden plants may only need it twice a week.
Which way do I plant a begonia tuber?
Begonia tubers have a distinct top and bottom. The top side has a shallow indentation or "hollow," which is where the new stems will grow. This hollow side should always face upward when planting. The rounded side should face down into the soil. If you aren't sure, you can plant the tuber on its side, and the stems will naturally find their way to the surface. If you want the short version, the planting begonia tubers article explains the same rule clearly.
Do I need to remove the dead flowers from my begonias?
While many modern begonia varieties are "self-cleaning" and will drop their old flowers on their own, removing spent blooms (deadheading) is still a good practice. It keeps the plant looking tidy and prevents old petals from sticking to the leaves, which can sometimes cause rot in very humid conditions. It also encourages the plant to focus its energy on producing new, vibrant buds.