Table of Contents
- Introduction
- Choosing the Best Begonias for Your Pots
- Selecting the Right Container and Soil
- When to Plant Your Begonias
- Step-by-Step: How to Plant Begonia Tubers
- Planting Started Begonias from a Nursery
- Finding the Perfect Spot: Light and Temperature
- Mastering the Art of Watering
- Feeding Your Begonias for Maximum Color
- Simple Maintenance for a Tidy Garden
- Woven Expectations: Weather and Growth
- Conclusion
- FAQ
Introduction
There is a special kind of magic in watching a begonia tuber wake up and transform into a lush, flower-heavy masterpiece. Whether you are looking to brighten a dim corner of your porch or add a tropical flair to your patio, these plants are the perfect solution. Begonias offer some of the most diverse colors and textures in the plant world, and they truly shine when grown in containers.
At Longfield Gardens, we enjoy helping gardeners discover how easy it is to grow these versatile beauties. Browse our begonia collection to see what is available. Planting begonias in pots allows you to control the environment perfectly, from the soil quality to the amount of light the plant receives. This makes them an excellent choice for both beginners and experienced gardeners who want reliable, season-long color without a lot of fuss.
This guide will walk you through everything you need to know to successfully plant and grow begonias in containers. We will cover choosing the right varieties, selecting the best pots, and the simple steps for planting and care. With just a few basics, you can create professional-looking displays that bloom from early summer right up until the first frost.
Choosing the Best Begonias for Your Pots
The first step to a successful container garden is picking the right plant for your specific space. Begonias are not a "one size fits all" plant. They come in several distinct types, each with its own growth habit and light preferences. Learn more in our Types of Begonias. Matching the variety to your pot and location ensures the plant will thrive rather than just survive.
Tuberous Begonias
These are the superstars of the shade garden. Tuberous begonias are grown from a bulb-like structure called a tuber. They are famous for their large, rose-like flowers that can reach several inches across. Within this category, you will find upright varieties, which look wonderful in traditional pots on tables, and trailing varieties (often called "pendula"), which are ideal for hanging baskets and the edges of window boxes. For a trailing display, Begonia Hanging Golden Balcony is a standout.
Wax Begonias
Wax begonias are often used as bedding plants, but they make fantastic "fillers" in mixed containers. They have succulent-like stems and waxy leaves that can be green or bronze. Unlike many other types, wax begonias are quite sturdy and can handle more sunlight. They produce clusters of small, cheerful red, pink, or white flowers all season long.
Rex Begonias
If you are more interested in stunning leaves than flowers, Rex begonias are the way to go. These are grown for their incredible foliage, which features swirls of silver, purple, burgundy, and forest green. They add a sophisticated, artistic touch to pots and are particularly well-suited for indoor-outdoor transition spaces like covered porches.
Cane Begonias
Also known as "angel wing" begonias due to the shape of their leaves, these plants grow on upright, bamboo-like stems. They can get quite tall, making them excellent "thriller" plants for the center of a large container. Their pendulous clusters of flowers are an added bonus to their attractive, often spotted, foliage.
Key Takeaway: Choose upright tuberous begonias for eye-level pots and trailing varieties for hanging baskets to make the most of their natural growth habits.
Selecting the Right Container and Soil
The beauty of container gardening is that you can move your plants around to find the perfect light. If you prefer a cascading look, the Hanging Begonias collection is a good place to start. However, because the plant’s roots are confined, the choice of pot and soil becomes much more important than it is in the ground.
Drainage is Essential
The most important rule for planting begonias in pots is to ensure there is a way for excess water to escape. Begonias have fleshy stems and roots that hold a lot of moisture. If they sit in waterlogged soil, the roots can quickly rot. Always choose a pot with at least one large drainage hole at the bottom. If you find a decorative pot you love that doesn't have a hole, use it as a "cachepot"—place the begonia in a slightly smaller plastic nursery pot with holes, then set that inside the decorative one.
Material and Size
Begonias actually prefer to be a little bit snug in their pots. For a fuller upright display, the Upright Double Begonias collection is a helpful reference. A pot that is too large will hold more soil than the roots can reach, which leads to cold, wet spots in the dirt. For a single tuber, a 6-inch to 8-inch pot is usually plenty. If you are planting multiple begonias in a larger container, space them about 4 to 6 inches apart.
The material of the pot also matters:
- Terra Cotta: These pots are porous and breathe well, which helps prevent overwatering. They are great if you tend to be heavy-handed with the watering can.
- Plastic or Glazed Ceramic: These hold moisture longer. They are excellent for busy gardeners who might skip a day of watering, as they keep the soil from drying out too quickly in the summer heat.
Choosing the Right Potting Mix
Never use "garden soil" or "topsoil" in your containers. It is too heavy and will compact over time, cutting off oxygen to the roots. Instead, use a high-quality, peat-based potting mix. Look for a mix that includes perlite or vermiculite (those little white or silver "rocks"), as these help keep the soil light and fluffy. This "drainage"—the speed at which water moves through the soil—is the secret to healthy begonias. A classic Begonia Upright Double Roseform Pink makes a beautiful single-pot choice.
What to do next:
- Check your pots for drainage holes before you start.
- Purchase a fresh bag of lightweight potting mix.
- Wash any old pots with mild soap and water to ensure a clean start.
When to Plant Your Begonias
Timing is everything when it comes to these tropical plants. Begonias are very sensitive to the cold. Even a light frost can damage the leaves, and cold soil can cause tubers to go dormant or rot before they even start growing.
Planting Tubers Indoors
Many gardeners like to get a head start by "starting" their begonia tubers indoors. For an earlier start, see our How to Start Tuberous Begonias Indoors. You can do this about 6 to 8 weeks before the last expected frost in your area. By the time the weather is warm enough to move the pots outside, your plants will already have several inches of growth and will bloom much earlier in the summer.
Moving Outdoors
Wait until the nighttime temperatures are consistently above 60°F before moving your pots outside for the season. If you live in a northern climate, this might not be until late May or early June. If a surprise cold snap is predicted, simply move your pots into the garage or house for the night to keep them cozy. If you are unsure about timing, check the Hardiness Zone Map.
Step-by-Step: How to Plant Begonia Tubers
If you are starting with tubers from us at Longfield Gardens, the planting process is simple and rewarding. Tubers might look like shriveled brown discs at first, but they are packed with energy.
Step 1: Identify the Top
Begonia tubers have a distinct "up" and "down." One side is slightly hollowed out or indented, like a shallow bowl. This is the top. The rounded, smooth side is the bottom. You may even see tiny pink or white "eyes" (buds) starting to sprout in the hollowed-out side. For a refresher on the tuber's shape, see How to Plant Tuberous Begonias: Which End Is Up?.
Step 2: Prepare the Pot
Fill your container with potting mix until it is about 2 inches below the rim. Lightly press the soil down, but do not pack it tightly. You want it to stay airy.
Step 3: Set the Tuber
Place the tuber on the soil surface with the hollow side facing up. If you are planting multiple tubers in a large pot, space them about 5 inches apart.
Step 4: Cover Lightly
Cover the tuber with about 1 inch of potting mix. It doesn't need to be deep. In fact, planting too deep can slow down the sprouting process.
Step 5: Water Sparingly
Water the soil just enough to settle it around the tuber. During these early stages, the tuber doesn't have roots yet to drink up water, so keep the soil barely moist. Overwatering at this stage is the most common mistake; think of the soil like a wrung-out sponge.
Key Takeaway: Always plant begonia tubers with the hollow side up and cover them with only an inch of soil for the fastest sprouting.
Planting Started Begonias from a Nursery
If you have purchased begonias that are already growing in small plastic pots, the process is slightly different. You are essentially "upcycling" them into a larger, more beautiful home.
Gently Loosen the Roots
When you take the plant out of its nursery pot, look at the roots. If they are circling the bottom of the pot in a tight mat, they are "root-bound." Gently tease the roots outward with your fingers. This encourages them to grow into the new soil rather than continuing to grow in a circle.
Plant at the Right Depth
Dig a hole in your new container that is the same size as the root ball. Place the plant in the hole so that the top of the root ball is level with the surrounding soil. Planting a begonia too deep—covering the stems with soil—can lead to stem rot.
Firm and Water
Gently press the soil around the base of the plant to remove large air pockets. Water the plant thoroughly until water runs out of the bottom of the pot. This helps the roots make contact with the new soil immediately.
Finding the Perfect Spot: Light and Temperature
Once your begonias are planted, where you put the pot will determine how many flowers you get. While begonias are famous for loving shade, the "right" kind of shade matters.
Morning Sun, Afternoon Shade
Most flowering begonias, especially the tuberous types, prefer "dappled sunlight" or "filtered shade." For more ideas on shade-loving bulbs, see Summer Bulbs for Shady Gardens. A spot that gets gentle morning sun (before 11:00 AM) and then bright shade for the rest of the day is ideal. The morning sun provides the energy needed for big blooms, while the afternoon shade protects the delicate leaves from the harshest heat of the day.
Deep Shade vs. Full Sun
If you have a spot that gets almost no direct sun, stick with Rex begonias. They will keep their vibrant leaf colors even in low light. For a cascading option in light shade, Begonia Hanging Pink Balcony is another good fit. Conversely, if your patio is very sunny, Wax begonias with bronze leaves are your best bet. They have been bred to withstand more intense light without scorching.
Protection from Wind
Because begonias have succulent, watery stems, they can be somewhat brittle. A strong gust of wind can snap a heavy flower head or a tall cane. Place your pots in a sheltered location, such as against a wall, on a covered porch, or tucked between other sturdier plants.
Action Steps for Location:
- Observe your porch or patio for a day to see where the shadows fall.
- Group pots together to create a humid microclimate, which begonias love.
- Avoid placing pots directly under a roof drip line where heavy rain could damage the blooms.
Mastering the Art of Watering
Watering is the most frequent task you will perform, and it is the one that has the biggest impact on your plant’s health. Container plants dry out much faster than plants in the ground, but begonias have a few specific needs.
The "Finger Test"
Instead of watering on a strict schedule, water based on the soil’s moisture level. Stick your finger into the soil up to the second knuckle. If the soil feels dry, it is time to water. If it still feels damp and cool, wait another day. Begonias prefer to have their soil stay consistently moist but never "swampy."
Where to Water
Always try to water the soil directly rather than pouring water over the leaves and flowers. Water sitting on the foliage can encourage mildew or spotting. If your begonia is very bushy and it’s hard to reach the soil, bottom-watering is a great alternative. Set the pot in a tray of water for 20 minutes, allowing the soil to "wick" the moisture up through the drainage holes, then empty the tray.
Adjust for Weather
On very hot or windy days, your pots may need water every single day. In cooler, cloudy weather, they might go three or four days without needing a drink. Always check the soil before you pour.
Feeding Your Begonias for Maximum Color
Begonias are "heavy feeders." Because they bloom continuously for months, they use up a lot of energy and quickly deplete the nutrients in a small pot of soil.
Choose the Right Fertilizer
For the best results, use a balanced, water-soluble fertilizer. A "balanced" fertilizer is one where the three numbers on the label (like 10-10-10 or 20-20-20) are the same. Alternatively, you can use a "bloom booster" formula, which has a higher middle number (phosphorus) to encourage more flower production.
Frequency and Application
During the peak growing season (summer), fertilize your begonias every two weeks. It is always better to use a weaker solution more often than a very strong solution once in a while.
Pro Tip: Never fertilize a plant that is wilted or bone-dry. Water the plant with plain water first, let it soak in, and then apply the fertilizer solution. This prevents the concentrated nutrients from "burning" the thirsty roots.
Key Takeaway: Regular feeding every two weeks with a water-soluble fertilizer is the secret to keeping begonias blooming until autumn.
Simple Maintenance for a Tidy Garden
Begonias are relatively low-maintenance, but a few minutes of "grooming" each week will keep them looking like they just came from a professional greenhouse. For more care ideas, read our Tips for Growing Tuberous Begonias.
Deadheading
"Deadheading" is the process of removing faded or spent flowers. On many tuberous begonias, the old flowers will eventually drop off on their own, but picking them off early keeps the plant looking tidy and prevents the old petals from sticking to the leaves, which can cause rot. Simply pinch the flower stem where it meets the main branch.
Pinching for Bushiness
If your begonia (especially Cane or Wax types) is starting to look "leggy"—meaning it has long stems with very few leaves at the bottom—you can pinch off the very tip of the growing stems. This signals the plant to grow new branches from the sides, resulting in a fuller, bushier plant with more flowers.
Monitoring for Pests
Keep an eye out for common visitors like aphids or spider mites. These are less common on begonias than on other plants, but they can occasionally appear. If you see tiny bugs or sticky residue on the leaves, a gentle spray with a garden hose or an application of insecticidal soap (following the label instructions) usually clears things up quickly.
Weekly Maintenance Checklist:
- Remove any yellowing or damaged leaves.
- Pinch off faded blooms.
- Check the undersides of leaves for any signs of pests.
- Rotate the pot a quarter turn so all sides of the plant get equal light.
Woven Expectations: Weather and Growth
While we can provide the best steps for success, it is important to remember that gardening involves a partnership with nature. Your begonias will grow at their own pace based on your local environment.
In a very hot, humid summer, your begonias might grow rapidly but may need more frequent watering and extra shade. In a cool, rainy summer, they may grow more slowly, and you will need to be extra careful not to overwater. If your plant goes through a period with fewer blooms, don't worry—this is often just a natural resting phase before the next big flush of flowers. Patience is part of the joy of watching a garden evolve.
Conclusion
Planting begonias in pots is one of the most rewarding ways to spend a Saturday afternoon. These plants offer a spectacular return on a small investment of time. By choosing the right variety for your light levels, ensuring excellent drainage, and keeping up with a simple watering and feeding routine, you can enjoy a tropical paradise right on your doorstep.
At Longfield Gardens, we take pride in providing high-quality tubers and plants to help you succeed. We stand behind our quality with a 100% Quality Guarantee, ensuring your items arrive in prime condition and are true to variety. If you ever have questions about your plants' performance during their first growing season, we are here to support you with replacements or advice.
"A well-planted begonia pot is more than just a decoration; it is a living focal point that brings color and life to the quietest corners of your home."
Ready to start? Here is your quick-start list:
- Pick a variety that fits your light (Shade for Tuberous, Sun for Wax).
- Use a pot with a drainage hole and fresh potting mix.
- Plant tubers hollow-side up, just 1 inch deep.
- Water when the top inch of soil feels dry and feed every two weeks.
FAQ
Do I need to soak begonia tubers before planting?
While some gardeners like to soak tubers for an hour in lukewarm water to "wake them up," it isn't strictly necessary. If your soil is moist and the temperatures are warm, they will naturally absorb the moisture they need to sprout. If you do choose to soak them, be careful not to leave them in the water for too long, as this can lead to rot.
Why are my begonia leaves turning yellow and falling off?
Yellowing leaves are most often a sign of overwatering. If the soil stays too wet, the roots cannot breathe, and the plant begins to shed leaves in stress. Check the drainage hole to make sure it isn't blocked, and let the top inch of soil dry out completely before you water again.
Can I keep my potted begonias for next year?
Yes, you can! If you have tuberous begonias, you can "overwinter" them by bringing the pots into a frost-free area like a basement or garage in the fall. Once the foliage dies back, stop watering and let the tuber go dormant. In the spring, you can repot them in fresh soil to start the cycle again.
My begonia has plenty of leaves but no flowers. What should I do?
A lack of flowers usually means the plant needs a bit more light or more nutrients. Try moving your pot to a slightly brighter location (though still avoiding harsh afternoon sun) and ensure you are using a bloom-boosting fertilizer every two weeks. Also, ensure the plant isn't getting too much nitrogen, which encourages leaves at the expense of flowers. For a broader overview of begonia types and care, see All About Begonias.