Table of Contents
- Introduction
- Is It Too Late to Plant?
- Understanding the Begonia Life Cycle
- The Benefits of Starting Later
- Choosing the Right Spot for Late Success
- How to Plant Begonia Tubers Correctly
- Caring for Begonias Throughout the Season
- Growing in Containers vs. the Ground
- Regional Timing and USDA Zones
- What to Do If You've Started Very Late
- Safety and Practical Success
- Protecting Your Investment for Next Year
- Conclusion
- FAQ
Introduction
Shade gardening offers a special kind of magic. While many flowers crave the intense heat of the midday sun, tuberous begonias thrive in the quiet, cool corners of the yard. There is a unique satisfaction in watching these "roses of the shade" transform a dim patio or a leafy garden bed into a gallery of vibrant color. At Longfield Gardens, we enjoy helping gardeners discover how these reliable plants can brighten up even the most overlooked spaces with minimal effort.
If you are looking at a handful of tubers and wondering if the window for planting has already closed, you are not alone. Many gardeners find themselves ready to plant just as the season feels like it is moving into full swing. This guide is for anyone who wants to know if they can still get begonias in the ground—or in a pot—and see those spectacular blooms before the season ends. We will cover how the timing of your planting affects your results and how to give your begonias the best possible start, even if you are beginning a little later than usual. For a broader overview, see our All About Begonias guide.
Whether you are a seasoned gardener or just starting your first container, the answer to your timing questions is usually more encouraging than you might think. While earlier is often better for a longer bloom season, begonias are remarkably resilient. The key is understanding how they grow and adjusting your care to match the current weather.
Is It Too Late to Plant?
The short answer is usually "no," provided you still have a few months of frost-free weather ahead of you. Begonias are tropical plants that love warmth and humidity. While they are often started indoors in late winter or early spring to get a head start, they are perfectly happy to begin their journey directly in the garden once the soil is warm.
If you are planting in May or June, you are still within an excellent window for most of the United States. In these months, the soil has naturally warmed up, which can actually help the tubers sprout faster than they would in the chilly dampness of early April. When you plant later in the spring, the plant often grows with more vigor because it isn't struggling against cold night temperatures.
For those considering planting in July, success depends heavily on your local climate. If you live in a region where the first frost doesn't arrive until late October or November, a July planting can still yield a beautiful late-summer and autumn display. You may have a shorter flowering period, but the blooms you do get will be just as stunning. The goal is to ensure the plant has enough time to mature and flower before the cold weather returns.
Understanding the Begonia Life Cycle
To understand why timing matters, it helps to know how a begonia tuber works. Think of the tuber as a small, brown energy pack. It contains all the nutrients and "instructions" the plant needs to send up its first stems and leaves. Because they carry their own fuel, begonias don't need much from the soil initially, which makes them very forgiving for beginners.
Once a tuber is tucked into warm, moist soil, it enters a "waking up" phase. This usually takes about three to five weeks. During this time, the tuber is busy developing a root system and pushing small, pinkish buds toward the surface. After the first leaves appear, the plant enters a period of rapid growth.
From the moment you plant a tuber, it typically takes about 12 to 15 weeks to see the first flowers. This is the most important number to keep in mind when deciding if it is too late. If your first expected frost is 16 weeks away, you have plenty of time to enjoy a beautiful show. If frost is only 8 weeks away, you might want to wait until next year or enjoy them as indoor houseplants instead.
The Benefits of Starting Later
While many people feel rushed to get their gardens planted by a certain date, starting begonia tubers a bit later in the season actually has several practical advantages. Gardening should be a relaxing hobby, and a later start can remove some of the stress associated with unpredictable spring weather.
Naturally Warm Soil
Begonias are tropical by nature. They do not like cold "feet." When tubers are planted in early spring, the soil is often still cold and saturated with water from spring rains. This can lead to slow growth or, in some cases, the tuber may sit idle. When you plant in late May or June, the soil temperature is usually 60°F or higher. This warmth acts like a signal to the tuber to start growing immediately, often resulting in faster sprouting and sturdier stems.
Skipping the Indoor Transition
Gardeners who start begonias in February or March must grow them indoors under lights or on windowsills. This requires space and the eventually delicate process of "hardening off," which is gradually moving the plants outside so they get used to the sun and wind. By planting later, you can often plant directly into your outdoor containers or garden beds, skipping the transition phase entirely.
Autumn Color
Many gardens begin to look tired by late August. Since late-planted begonias hit their peak bloom a bit later, they provide a fresh burst of color just as other summer flowers are starting to fade. They will continue to bloom right up until the first frost, making them a perfect companion for fall-blooming perennials.
Key Takeaway: Planting begonias in warm soil often leads to faster growth. As long as you have at least 12-14 weeks before the first frost, you can still enjoy a rewarding bloom season.
Choosing the Right Spot for Late Success
Because you are starting with a shorter window of time, choosing the perfect location becomes even more important. You want to give the plant every advantage so it can focus its energy on growing quickly.
Light Requirements
Begonias are famous for their love of shade, but they do need some light to produce flowers. For more on choosing the right exposure, see our Are Begonias a Shade Plant? guide. The "perfect" spot usually offers dappled sunlight or "bright shade." This means a place where the plant is protected from the harsh, direct afternoon sun but still receives plenty of reflected light. An east-facing patio that gets morning sun and afternoon shade is often the ideal environment.
Drainage is Essential
"Drainage" is simply a gardening term for how fast water leaves the soil. Begonia tubers are susceptible to rot if they sit in water that cannot escape. For more container tips, see our Can Begonias Be Planted in Pots? guide. Whether you are planting in the ground or in a pot, ensure the soil is loose and porous. If you are using containers, always make sure there are holes in the bottom. A high-quality potting mix designed for containers is usually much better than heavy "topsoil" from the backyard.
Airflow and Space
While it is tempting to crowd plants together for an instant full look, begonias appreciate a little breathing room. Good airflow helps keep the foliage dry and prevents common issues like powdery mildew. Space your tubers about 8 to 12 inches apart to give them room to reach their full, bushy potential.
How to Plant Begonia Tubers Correctly
Getting the tuber into the ground the right way is one of the simplest wins in gardening. It only takes a moment to check, and it ensures the plant doesn't have to work extra hard to reach the surface.
Identify the "Up" Side
Begonia tubers have a distinct shape that looks like a small, shallow bowl or a thick coin with a thumbprint in the middle. The concave, or hollowed-out side, is the top. This is where the stems will grow from. The rounded, smooth side is the bottom, where the roots will emerge.
Planting Depth
You do not need to bury begonias deep in the earth. In fact, planting them too deep can slow down their progress. Aim for a depth of about 1 inch. You want just enough soil over the top of the tuber to keep it moist and protected. If you are planting in a pot, you can even leave the very top of the tuber visible until you see the first green sprouts, then add a thin layer of soil. For a closer look at depth, see How Deep Do You Plant Begonias in Pots?.
Watering at the Start
When you first plant the tuber, give the soil a light watering to settle it around the "bulb." After that, be patient. The soil should stay moist like a wrung-out sponge, but never "muddy." Overwatering before the plant has leaves is a common reason tubers fail to sprout. Once you see green leaves, you can begin a more regular watering routine.
- Check the tuber for a "bowl" shape (this side faces up).
- Dig a shallow hole about 1 inch deep.
- Place the tuber in the hole and cover lightly with soil.
- Water gently once, then wait for sprouts.
Caring for Begonias Throughout the Season
Once your begonias have sprouted and developed a few sets of leaves, they are remarkably easy to care for. They are not "fussy" plants, but a little consistent attention will keep them blooming prolifically until the end of the season.
The "Deep Water" Rule
Instead of giving your plants a tiny sip of water every day, it is better to water them deeply and then wait until the top inch of soil feels dry to the touch. This encourages the roots to grow deeper into the pot or garden bed, making the plant more resilient. When watering, try to pour the water at the base of the plant rather than over the leaves to keep the foliage healthy.
Feeding Your Flowers
Since begonias are heavy bloomers, they appreciate a little extra nutrition. Every two to three weeks, you can use a balanced, water-soluble fertilizer. Follow the instructions on the package for "flowering plants." This provides the energy the plant needs to keep producing new buds even as the days get shorter in late summer. For a broader care refresher, see our How to Take Care of a Begonia Plant guide.
The Art of Deadheading
"Deadheading" is simply the practice of removing flowers that have finished blooming. When a flower starts to wilt or turn brown, snip it off about an inch below the bloom. This prevents the plant from trying to make seeds and instead signals it to produce even more flowers. It also keeps your garden or patio looking tidy and fresh.
Growing in Containers vs. the Ground
If you are planting late in the season, containers are often the best choice for begonias, and Begonia Hanging Golden Balcony is a strong fit for hanging baskets and large planters. There are several reasons why pots and hanging baskets give you a "speed boost" that the open ground might not.
Temperature Control
The soil in a container warms up much faster than the ground. Because begonias love warmth, Begonia Upright Double Roseform Pink is a lovely choice for containers. This is a significant advantage if you are starting in late May or June.
Mobility
If a surprise early frost is predicted in the fall, you can easily move a container into a garage or onto a covered porch to protect it. This allows you to extend your blooming season by several weeks, giving those late-planted tubers plenty of time to finish their show.
Soil Quality
When you use a container, you have total control over the soil. You can use a premium potting mix that provides the perfect balance of moisture retention and drainage. In the ground, you may have to deal with heavy clay or sandy soil, which can be more challenging for a tuber that is trying to grow quickly. For a bright, tidy look, Begonia Upright Double Picotee White is ideal for containers.
Key Takeaway: If you are planting late, choose a container. The warmer soil and the ability to move the plant away from early frost will help you maximize your bloom time.
Regional Timing and USDA Zones
In the United States, we use "hardiness zones" to help determine when it is safe to plant. Our Hardiness Zone Map can help you find yours. These zones are based on the average minimum winter temperature in your area. While begonias are grown as annuals in most of the country (meaning they don't stay in the ground over winter), your zone tells you how long your growing season is.
Zones 3 through 6 (Northern States)
In these cooler climates, the growing season is shorter. If you are planting in these zones, it is best to get your tubers started by early June at the latest. If you find yourself wanting to plant later, definitely use containers so you can bring them inside if the temperatures drop in September.
Zones 7 through 10 (Southern and Coastal States)
These regions have much longer frost-free periods. In Zone 8 or 9, you can often plant begonia tubers as late as early July and still see a spectacular show in September and October. The challenge in these zones is the heat; make sure your begonias are in a very shady, cool spot to help them thrive during the peak of summer.
At Longfield Gardens, we time our shipping based on these zones to ensure your tubers arrive when the weather is appropriate for your specific area. See our Shipping Information page for details. However, if you find yourself with extra tubers later in the season, don't be afraid to give them a try.
What to Do If You've Started Very Late
If you find yourself with begonia tubers and it is already mid-summer, you have two great options. You can either plant them and enjoy whatever blooms the season allows, or you can grow them as indoor houseplants.
The Indoor Option
Begonias make excellent houseplants. If it is too late to expect a full outdoor bloom season, plant a pot-ready option like Begonia Upright Double Bertini in a pot and keep it on a bright windowsill inside. They will enjoy the consistent temperatures of your home. You can keep them growing through the winter, or you can let them go dormant in the fall and save the tubers for a much earlier start outdoors next spring.
Maximizing a Short Season
If you decide to plant them outdoors late, consider choosing Begonia Non Stop Mix - Bulk Offer. As the name suggests, these are bred to bloom early and often. They tend to be a bit more vigorous and can make the most of a shorter growing season.
Safety and Practical Success
While gardening is a peaceful and safe activity, it is always a good idea to keep a few practical things in mind. Begonia tubers and foliage can be toxic if eaten by pets or small children. It is always best to place your pots out of reach of curious nibblers and to wash your hands after handling tubers or plants. At Longfield Gardens, we want every gardener to feel confident and successful, and we stand behind every order with our 100% Quality Guarantee.
Remember that gardening is not an exact science. Your soil, your specific microclimate, and the daily weather will all influence how fast your begonias grow. If one year they take a little longer to bloom, don't worry—the beauty of a begonia is always worth the wait.
Protecting Your Investment for Next Year
One of the best things about tuberous begonias is that the tubers can be saved and used again next year. If you plant late and feel like you didn't get enough time with your flowers, you can "lift" the tubers in the fall and store them.
When the foliage begins to yellow or after the first light frost kills the leaves, carefully dig up the tubers. Cut the stems back to about an inch, shake off the soil, and let them dry in a cool, dark place for a few days. Once they are dry, store them in a paper bag or a box with some peat moss in a place that stays cool but never freezes (like a basement). Next spring, you will have a head start and can plant them even earlier!
Conclusion
It is almost never too late to add beauty to your garden. Tuberous begonias are among the most rewarding plants for a shade gardener, offering lush foliage and rose-like blooms that last for weeks. Even if you are starting later than the "traditional" spring window, these resilient plants can still provide a wonderful display of color. By focusing on warm soil, proper drainage, and consistent water, you can help your begonias grow quickly and healthily.
At Longfield Gardens, we want every gardener to feel confident and successful. Gardening is a journey, and every season offers a new opportunity to learn and grow. Whether you are planting in April or June, the most important step is simply getting started.
- Plant in warm soil (above 60°F) for the fastest sprouting.
- Ensure the "bowl" side of the tuber faces up and is covered by 1 inch of soil.
- Use containers for late-season plantings to take advantage of warmer soil and portability.
- Feed every 2-3 weeks to give late-planted begonias an energy boost.
Success in the garden isn't about following a strict calendar; it's about matching your plants to the conditions you have right now. Begonias are ready to grow whenever you are ready to plant them.
We invite you to explore the many colors and shapes of begonias available and find the perfect match for your shady spots. With just a little bit of care, your garden can be a vibrant sanctuary all summer long.
FAQ
If I plant begonia tubers in June, will they still bloom?
Yes, in most regions, begonias planted in June will begin blooming by late August or early September. Because they continue to flower until the first frost, you will still enjoy several weeks of color. To speed up the process, plant them in containers where the soil stays warmer.
Can I plant begonia tubers directly in the ground late in the season?
You certainly can, as long as the soil is warm and well-draining. However, if you are planting very late, containers are usually a better choice because they allow for faster growth and can be moved to a protected area if an early frost is predicted in your area.
How do I know which side of the begonia tuber is the top?
Look for a side that is slightly indented, similar to a shallow bowl or a thumbprint. This concave side is the top and should face upward. The other side is typically rounded and smoother; this is the bottom where the roots will grow.
What happens if I plant my begonias and then it gets cold?
Begonias are very sensitive to frost and cold temperatures below 50°F. If you have already planted them and a cold snap is predicted, cover the area with a frost blanket or move your containers into a garage or shed until the temperatures rise again. For zone-based timing, our Hardiness Zone Map is a helpful reference.