Table of Contents
- Introduction
- The Best Time to Plant Begonias Outdoors
- Monitoring Soil and Nighttime Temperatures
- Starting Begonia Tubers Indoors
- Hardiness Zones and Shipping Timing
- Choosing the Right Location for Planting
- Step-by-Step Planting Guide
- Water Correctly, Not Constantly
- Feeding Your Begonias for Maximum Blooms
- What to Expect: The Begonia Growth Timeline
- Transitioning from Summer to Fall
- Troubleshooting Common Growth Questions
- Using Begonias in Your Landscape Design
- The Joy of a Shaded Retreat
- Conclusion
- FAQ
Introduction
Few plants bring the same level of cheer and reliable color to a shaded garden as begonias. Whether you are looking for the cascading blooms of a hanging basket or the sturdy, rose-like flowers of an upright variety, these plants are a fantastic choice for any skill level. At Longfield Gardens, we enjoy seeing how these tropical favorites transform porches, patios, and garden beds into lush, vibrant retreats. Browse our Begonia Flower Bulbs for Sale to find the right fit for your yard.
Success with these flowers starts with one simple factor: timing. Because they are tropical in nature, they have specific needs when it comes to temperature and light. For a broader look at begonia types and care, start with All About Begonias. This guide is for any gardener who wants to understand exactly when to get their begonias into the soil for a full season of spectacular color. We will cover how to time your planting based on your local climate and how to give your plants the best possible head start.
The most important rule for begonia success is to wait for the warmth, as these plants thrive when the soil and air have finally moved past the chill of spring.
The Best Time to Plant Begonias Outdoors
The most common question for any gardener ready to start their summer garden is "when can these go in the ground?" For begonias, the answer is always tied to the weather rather than a specific date on the calendar. If you're wondering whether yours can go outside yet, Can a Begonia Be Planted Outside? covers the timing in more detail. Because they are native to tropical regions, they have no tolerance for frost and very little patience for cold soil.
In most parts of the United States, the ideal time to plant begonias outdoors is in late spring or early summer. This usually happens a few weeks after the danger of frost has completely passed. You want the environment to feel like summer before these plants make their outdoor debut.
While it is tempting to plant as soon as the first warm day arrives, it is better to wait until the "settled" warm weather arrives. This means the trees are fully leafed out and you are no longer reaching for a heavy jacket in the evening. If you plant too early, the cool soil can cause the plants to sit dormant or, in some cases, struggle to establish roots. Waiting for the right moment ensures that once they hit the soil, they begin growing immediately.
Monitoring Soil and Nighttime Temperatures
If you want to be precise about when to plant, put away the calendar and pick up a soil thermometer. Begonias are at their happiest when the soil temperature is consistently at or above 60°F. Cold, damp soil is the primary reason for slow starts in the garden. When the soil is warm, the tubers or root balls can begin drawing up nutrients and moisture right away.
Nighttime air temperatures are just as important as the soil. We recommend waiting until nighttime temperatures stay reliably above 50°F to 60°F. If you still have nights dipping into the 40s, it is best to keep your plants protected in a garage or indoors for a little longer.
Think of begonias as "warm-weather enthusiasts." They do not just survive in the heat; they thrive in it. By matching your planting schedule to these temperature milestones, you are following the first of our simple gardening rules: right plant, right place, and right time.
Key Takeaway: The best time to plant begonias outdoors is when the soil is 60°F and nighttime temperatures no longer drop below 50°F.
Starting Begonia Tubers Indoors
If you live in a region with a short growing season, you do not have to wait for summer to get started. One of the best ways to enjoy blooms earlier in the year is to start your tubers indoors. This process is often called "pre-starting" or "waking up" the tubers.
We suggest starting begonia tubers indoors about 8 to 12 weeks before your area’s average last frost date. For many gardeners, this means planting them in pots inside the house during March or April. If you want a container-focused primer, How to Plant a Begonia in a Pot for Beautiful Blooms walks through the basics. This extra lead time allows the plant to develop a strong root system and several inches of leafy growth before it ever touches the garden soil.
Starting early indoors gives you a significant advantage. By the time the outdoor weather is warm enough for planting, you will have a small, established plant ready to go. This can result in flowers appearing as early as June, rather than waiting until late summer for the first blooms to arrive.
What to Do Next: Starting Indoors
- Check your local frost dates to determine your 8-to-12-week window.
- Select shallow pots or trays with excellent drainage.
- Use a high-quality, moist potting mix.
- Place the tubers with the indented side facing up, just below the soil surface.
- Keep the pots in a warm spot (around 70°F) with bright, indirect light.
Hardiness Zones and Shipping Timing
At Longfield Gardens, we want to make the timing as easy as possible for you. We manage our shipping schedule based on USDA hardiness zones. Learn more in our Shipping Information. This means we generally time your delivery to arrive about two weeks before the ideal planting time for your specific region.
If you live in a warm climate like Florida or parts of California (Zones 9–11), your planting window opens much earlier than someone in Michigan or Maine (Zones 3–5). Check our Hardiness Zone Map to match your planting window to your region. In those southern zones, begonias can often be treated as perennials, staying in the ground year-round. However, in most of the United States, they are grown as annuals that provide incredible color for a single season.
When your order arrives, it is a sign that spring is moving in. If the weather in your backyard is still showing signs of late-winter chill, you can keep the tubers in their packaging in a cool, dry place for a short time, or go ahead and start them indoors to get a jump on the season. We ship to the 48 contiguous United States and use reliable carriers like UPS and FedEx to ensure your plants arrive in prime condition.
Choosing the Right Location for Planting
Once the timing is right, the next step is choosing the perfect spot. Begonias are famous for their ability to brighten up the shady corners of your yard. If you're sorting out light levels, Are Begonias a Shade Plant? is a helpful place to start. While many flowering plants demand six to eight hours of direct sun, most begonias prefer filtered light or partial shade.
The ideal location is one that receives gentle morning sunlight but is protected from the harsh, drying rays of the afternoon sun. If you plant them in a spot that is too sunny, the leaves may scorch or turn a bit yellow. If the spot is too dark, you will get beautiful leaves but fewer flowers. Look for "dappled" shade, such as the area under a tall tree or a covered porch.
Drainage is the other half of the "right place" equation. Begonias have fleshy stems and tubers that hold a lot of water. They do not like to sit in soggy soil, which can lead to health issues for the plant. Whether you are planting in a garden bed or a container, make sure the water can move away from the roots easily. If your garden soil is heavy clay, consider using raised beds or containers to give your plants the drainage they need.
Step-by-Step Planting Guide
When the soil is warm and your site is selected, planting is a quick and rewarding task. For a closer look at spacing, see How Many Begonia Plants Per Pot?. Getting the depth and spacing right is a quiet win that leads to much healthier plants later in the summer.
For Garden Beds
Start by loosening the soil in your planting area to a depth of about six inches. If your soil is a bit lean, you can mix in some compost to add nutrients. Space your plants about 10 to 12 inches apart. This might look like a lot of empty space at first, but begonias fill out quickly, and they appreciate the airflow between their leaves.
For tubers, place them in a shallow hole about one inch deep with the "hollow" or indented side facing up. This is where the new sprouts will emerge. Cover the tuber with just a thin layer of soil. If you are transplanting a begonia that you started indoors, plant it at the same depth it was growing in its pot.
For Containers and Hanging Baskets
Containers are perhaps the most popular way to grow begonias. Choose a pot with drainage holes at the bottom. Fill it with a lightweight potting mix rather than garden soil. Garden soil is too heavy for pots and does not drain fast enough. For upright forms in patio pots, our Upright Double Begonias collection is a helpful starting point.
In a standard 12-inch hanging basket, you can plant two or three tubers. This creates a full, lush look as the stems grow and begin to cascade over the sides. If you want a softer pink display, bright pink hanging begonias are a good fit. For upright varieties in patio pots, one plant per 8-inch pot or three per 14-inch pot is usually a perfect fit.
Key Takeaway: Plant tubers indented-side up, one inch deep, and space them 10–12 inches apart to allow for growth and airflow.
Water Correctly, Not Constantly
One of the most important simple gardening rules we share is to water deeply but not constantly. Because begonias store water in their stems, they are more resilient than they look, but they do have specific preferences.
The goal is to keep the soil moist, like a wrung-out sponge, but never saturated. When you water, do so at the base of the plant. Try to keep the foliage dry, as water sitting on the leaves in a shady area can lead to spotting or mildew. If you want a deeper dive into moisture management, How Often Do You Water a Begonia Plant? can help. During the hottest part of the summer, containers may need water every day, while plants in the ground might only need it two or three times a week.
The best way to tell if it is time to water is the "finger test." Stick your finger an inch into the soil. If it feels dry, go ahead and give the plant a good soak. If it still feels damp, wait another day. This simple check prevents the most common beginner mistake: overwatering.
Feeding Your Begonias for Maximum Blooms
To keep the flower show going from June until the first frost, your begonias will appreciate a little extra boost. They are relatively "hungry" plants because they put so much energy into producing those large, colorful blooms.
We recommend using a balanced, water-soluble fertilizer every two to three weeks during the growing season. Alternatively, you can use a slow-release fertilizer at the time of planting. Look for a formula designed for flowering plants, which will have the nutrients needed to support bud production.
If you notice your plant is producing lots of green leaves but few flowers, it might be getting too much nitrogen. Switching to a fertilizer with a higher middle number (phosphorus) can help steer the plant back toward blooming. Regular feeding ensures the plants stay vigorous even during the high heat of July and August.
What to Expect: The Begonia Growth Timeline
Gardening is a practice in patience, but begonias are quite rewarding to watch. Once you plant your tubers, it usually takes about two to four weeks to see the first green sprouts poking through the soil. If the weather is particularly cool, they may take a little longer—don't worry, they are just waiting for the warmth.
By six to eight weeks after planting, the foliage will be well-established. You will see the characteristic asymmetrical leaves filling out the space. The first flower buds usually appear shortly after the foliage reaches its mature size.
Once they start blooming, begonias are "self-cleaning," meaning most varieties do not require you to pinch off dead flowers to keep the new ones coming. They will simply continue to produce new buds at the ends of the stems all the way through the autumn. It is an exciting process that provides a steady sense of achievement throughout the summer.
Transitioning from Summer to Fall
As the days grow shorter and the air turns crisp, your begonias will begin to slow down. They are very sensitive to the first signs of frost. When temperatures start to dip into the 40s consistently, the leaves may begin to turn yellow. This is a natural part of the plant's life cycle.
For most gardeners, this is the time to say goodbye to the plants for the year and add the foliage to the compost pile. However, if you have grown tuberous begonias, you have the option to save the tubers for next year. This is a great way to keep your favorite colors returning season after season.
Before the first hard frost, dig up the tubers and cut back the stems to about an inch. Let the tubers dry in a shaded, frost-free area for a few days until the remaining stem stub falls off easily. You can then store the clean tubers in a box of peat moss or sawdust in a cool, dark place (around 50°F) until next spring.
Troubleshooting Common Growth Questions
If your begonias aren't performing quite as you expected, the fix is usually a simple adjustment. Remember our rule: change one thing at a time and observe the results.
If the plants look leggy or "stretched out," they are likely searching for more light. Try moving your container to a slightly brighter spot that gets a bit more morning sun. If the edges of the leaves look brown and crispy, they might be getting too much sun or the air might be too dry. Moving them to a more sheltered, shadier spot often solves the problem.
If you see the plant dropping its buds before they open, it is often a sign of uneven watering. Make sure you are keeping the moisture levels consistent. Begonias are very communicative—if you watch their leaves and flowers, they will usually tell you exactly what they need.
Using Begonias in Your Landscape Design
Because begonias come in so many forms, they are incredibly versatile in the garden. Upright varieties are perfect for the middle of a flower bed, where they provide a solid block of color. If you like a fuller, romantic look, deep pink upright begonias are a natural fit. They also make excellent "thrillers" in the center of a large patio pot.
Trailing or "cascade" begonias are the stars of window boxes and hanging baskets. Their stems grow out and then drape downward, covered in blooms. See our Hanging Begonias collection. These are particularly effective when hung at eye level on a porch, where you can enjoy the intricate details of the flowers up close.
Consider pairing your begonias with other shade-lovers. They look stunning alongside the dramatic leaves of caladiums or the fine textures of ferns. The bright colors of the begonias provide a beautiful contrast to the deep greens of a hosta garden. For a warm finishing touch, golden hanging begonias add a cheerful glow.
The Joy of a Shaded Retreat
Gardening should be a rewarding and relaxing part of your day, not a source of stress. Begonias embody this idea perfectly. Once they are tucked into the right spot at the right time, they require very little from you other than regular water and a bit of food.
There is a unique satisfaction in sitting on a porch surrounded by the lush, cooling green of begonia leaves and the pops of bright red, orange, or pink flowers. They turn the "difficult" shady parts of a yard into the most beautiful parts. By following the simple steps of waiting for the warmth and providing good drainage, you can achieve professional-looking results with very little effort.
Conclusion
Planting begonias is one of the easiest ways to bring consistent, high-impact color to the shaded areas of your home. By focusing on the "when"—waiting for the soil to hit 60°F and the frost to pass—you set your garden up for a stress-free and successful season. Whether you start your tubers indoors for a head start or plant them directly in the ground as the summer heat arrives, these plants will reward you with beauty for months on end.
At Longfield Gardens, we are committed to helping you grow a more beautiful world. We stand behind the quality of our tubers with a 100% guarantee that they are true to variety and arrive in prime condition. If you ever have a question about timing or care, our team is here to support you.
- Wait for settled warm weather and 60°F soil before planting outdoors.
- Start tubers indoors 8–12 weeks early for the longest bloom season.
- Choose a spot with filtered light and excellent drainage.
- Water when the top inch of soil feels dry and fertilize every few weeks.
"The secret to a stunning begonia display isn't a magic trick; it's simply respecting the plant's love for warmth and its need for a well-drained home."
Ready to start your shade garden? Visit our website to browse our favorite begonia varieties, including golden hanging begonias, and find the perfect match for your yard.
FAQ
Can I plant begonias if it is still raining a lot in the spring?
It is best to wait until the heavy spring rains have subsided and the soil is no longer "mucky." Begonia tubers are sensitive to excess moisture before they start growing, so planting them in warm, damp—but not soggy—soil is the best approach for a healthy start.
What happens if a surprise frost occurs after I plant my begonias?
If a late frost is predicted after you have moved your plants outdoors, you should protect them. For containers, simply move them into a garage or indoors for the night. For plants in the ground, cover them with a light frost blanket or a bucket to trap the ground's warmth.
Do I need to soak begonia tubers before planting them?
Soaking is not necessary for begonia tubers. As long as you plant them in moist potting mix and keep them in a warm environment, they will naturally absorb the hydration they need to break dormancy and begin sprouting.
How much sun can begonias actually handle?
This depends largely on your climate. In cooler northern states, begonias can often handle more sun, sometimes even a half-day. In the hot South, they need much more protection and should generally be kept in full or dappled shade during the heat of the afternoon.