How to Grow Begonia Flowers

Table of Contents

1. Introduction
2. Choosing the Right Begonias for Your Garden
3. Where and When to Plant Begonias
4. How to Plant Begonia Tubers
5. Ongoing Care and Maintenance
6. Growing Begonias in Containers and Hanging Baskets
7. Propagating Your Begonias
8. Dealing with Common Challenges
9. Overwintering and Storage
10. Conclusion
11. FAQ

Introduction

Shade gardens often feel like quiet, green retreats, but they can also be home to some of the most vibrant colors in the landscape. Begonias are the undisputed champions of the shade, offering a dazzling array of flower shapes and foliage patterns that thrive where other plants might struggle. Whether you want the massive, rose-like blooms of tuberous varieties or the intricate, swirling leaves of Rex begonias, these plants bring a tropical flair to any porch, patio, or flower bed.

At Longfield Gardens, we believe that every corner of your yard deserves to look its best, and begonias make that goal easy to achieve. We provide premium tubers and plants to help you start your growing season with confidence. This guide is designed for home gardeners who want to understand the simple steps needed to enjoy these spectacular blooms from early summer all the way through the first frost.

The following sections cover everything from selecting the right variety for your space to the specific steps for planting and long-term care. You will learn how to manage water, light, and soil to keep your plants healthy and productive. Growing begonias is a rewarding experience that proves you do not need full sun to have a stunning, high-impact garden.

Choosing the Right Begonias for Your Garden

Before you get your hands in the dirt, it is helpful to know that "begonia" is a broad term. There are thousands of species and hybrids, but most home gardeners focus on a few main groups. Each group has a slightly different look and growth habit, so matching the plant to your specific garden goals is the first step toward success.

Tuberous Begonias

Tuberous begonias are famous for their large, dramatic flowers that can look like roses, camellias, or carnations. These grow from a thickened underground stem called a tuber. They are excellent for containers and hanging baskets because they produce heavy clusters of blooms in shades of red, orange, yellow, pink, and white. Some varieties have an upright habit, while others trail beautifully over the edges of a pot. A good place to start is the Non Stop Begonias collection, which offers dependable, roselike blooms.

Wax Begonias (Fibrous-Rooted)

These are the classic bedding plants often seen in public parks and front borders. They have waxy, succulent leaves that are either green or bronze. While the flowers are smaller than tuberous types, they are incredibly prolific. Wax begonias are tough and can handle more sunlight than most other varieties. If you want a dramatic, full-flowered option, the Begonia Upright Double Begonias collection is another strong choice.

Rex Begonias

If you love interesting textures and patterns, Rex begonias are for you. While they do produce small flowers, they are grown primarily for their foliage. The leaves can feature swirls of silver, purple, burgundy, and emerald green. They are popular as houseplants but also thrive in shaded outdoor containers during the warm months.

Cane-Like Begonias (Angel Wing)

Named for their long, upright stems and wing-shaped leaves, these begonias are elegant and architectural. They often have silver spots on their foliage and produce drooping clusters of flowers. They can grow quite tall if given the space, making them a great focal point for a large planter. For a bold, frilled flower form, the Begonia Upright Fimbriata Ruffled Yellow is a striking example.

Key Takeaway: Choose tuberous begonias for massive blooms, wax begonias for reliable garden borders, and Rex or Angel Wing varieties for spectacular foliage and texture.

Where and When to Plant Begonias

Begonias are tropical plants by nature. This means they appreciate warmth, humidity, and protection from the harshest elements. Success starts with choosing a location that mimics their native environment. For a deeper look at placement, see Where to Plant Begonias: Sun or Shade?.

Light Requirements

Most begonias prefer filtered light or partial shade. Direct afternoon sun in hot climates can scorch the leaves and cause the flowers to wilt. A spot that receives gentle morning sun and shade from 12:00 PM onwards is usually ideal. If you have a very dark corner, Rex begonias are your best bet, as they are particularly well-suited to lower light levels.

Soil and Drainage

The word "drainage" simply refers to how fast water leaves the soil. Begonias have fleshy stems that store water, which makes them very sensitive to "soggy feet." If they sit in water for too long, the stems and roots can rot.

• In the ground: Look for a spot where water does not puddle after a rain. If your soil is heavy clay, consider planting in raised beds.
• In containers: Always use a pot with at least one drainage hole. A high-quality, peat-based potting mix is usually the best choice because it holds moisture without becoming compacted.

Timing Your Planting

Because they are sensitive to cold, you should never plant begonias outdoors until the danger of frost has passed. In most regions, this means waiting until the soil has warmed to at least 60°F and nighttime temperatures stay consistently above 50°F. If you are unsure about your garden's climate, the Hardiness Zone Map can help you check your zone.

If you live in a cold climate (Zones 3-8), you can get a head start by planting tubers indoors 8 to 12 weeks before the last frost date. This gives the plants time to develop a strong root system so they are ready to bloom shortly after they move outside. For those in warm climates (Zones 9-11), begonias can often be grown as perennials or planted earlier in the spring.

How to Plant Begonia Tubers

If you are starting with tubers, the planting process is slightly different than planting a nursery-grown start. Tubers look like small, brown, shriveled disks, and it can sometimes be confusing to tell which side is up.

Step 1: Identify the Top

Look for the indented or hollow side of the tuber. This concave side is the top, where the new growth will emerge. The rounded side is the bottom, where the roots will grow. If the tuber already has small pink or green "eyes" (buds) starting to sprout, ensure those are facing upward.

Step 2: Prepare the Soil

Loosen the soil in your planting area or fill your container with potting mix. If you are planting in the ground, you can mix in some compost or well-rotted manure to provide a slow-release source of nutrients. For more background on soil preparation and plant types, All About Begonias is a helpful companion guide.

Step 3: Set the Depth

Place the tuber on the soil surface and press it in gently. You only need to cover the tuber with about half an inch to one inch of soil. Planting them too deep can delay sprouting or cause the tuber to rot before it can grow.

Step 4: Spacing

Give your plants room to breathe. Space tubers about 10 to 12 inches apart. Good air circulation is a simple way to prevent fungal issues later in the season.

Step 5: Initial Watering

Water the area lightly to settle the soil around the tuber. Avoid soaking the soil completely until you see green growth appearing above the surface. Once the plant has leaves, it will be able to process more water.

What to Do Next:

• Check your local frost dates to time your planting correctly.
• Prepare your pots or garden beds with fresh, well-draining soil.
• Place tubers "hollow-side up" and cover lightly with soil.

Ongoing Care and Maintenance

Once your begonias are established and growing, they are relatively low-maintenance. However, a few consistent habits will keep them blooming vigorously until the end of the season.

Watering Correctly

The goal is to keep the soil consistently moist but never saturated. Check the soil by sticking your finger about an inch deep. If it feels dry, it is time to water.

• Water at the base: Avoid splashing water on the leaves and flowers. Wet foliage can encourage powdery mildew or other fungal spots.
• Morning is best: Watering in the morning allows any accidental splashes to dry in the sun, which keeps the plant healthier.
• Adjust for heat: In the peak of summer, container-grown begonias may need water every day, while those in the ground might only need it twice a week.

Fertilizing for Blooms

Begonias are "heavy feeders," meaning they use a lot of nutrients to produce those constant flowers. We suggest using a balanced, water-soluble fertilizer every two to three weeks during the growing season. A fertilizer with a slightly higher middle number (phosphorus) can help encourage more blooms. Always follow the instructions on the product label to avoid over-fertilizing, which can burn the tender roots.

Deadheading and Pruning

"Deadheading" is the process of removing faded or spent flowers. Many modern begonia varieties are "self-cleaning," meaning the old flowers fall off on their own. However, if you see wilting blooms hanging on the plant, pinching them off will keep the plant looking tidy and prevent the formation of seeds, which directs more energy into new flowers.

If your begonias start to look "leggy" (long stems with few leaves), do not be afraid to prune them. Cutting back the stems by a few inches encourages the plant to branch out, resulting in a fuller, bushier shape.

Growing Begonias in Containers and Hanging Baskets

Begonias are perhaps the most popular choice for shade-loving containers. Their ability to thrive in limited root space and their trailing varieties make them perfect for hanging baskets, window boxes, and decorative urns. For ready-made combinations, the Assorted Bold Container for Shade Collection includes begonias suited to brightening shady spaces.

Choosing the Right Pot

When selecting a container, size matters. A 12-inch pot can comfortably hold two to three begonias. If you are using a hanging basket, choose a trailing variety like 'Pendula' or 'Cascading' begonias. These types are specifically bred to spill over the sides, creating a waterfall of color. A classic option for this look is Begonia Hanging Pink Balcony.

Potting Mix Essentials

Never use garden soil in a container. It is too heavy and will pack down, preventing air from reaching the roots. Instead, use a light potting mix containing perlite or vermiculite. These ingredients help with "aeration," which just means keeping the soil loose so the roots can breathe.

Maintenance in Pots

Plants in containers dry out much faster than those in the ground. Because the pot is exposed to air on all sides, the moisture evaporates quickly.

• Check daily: During heatwaves, check your baskets every morning.
• Nutrient flush: Every time you water a container, some nutrients wash out the bottom. This is why regular fertilizing is even more important for potted begonias than for those in garden beds.

Key Takeaway: Container begonias need daily moisture checks and regular feeding to maintain their lush, overflowing appearance.

Propagating Your Begonias

One of the most exciting parts of growing begonias is how easy it is to make new plants. You do not have to be an expert to succeed with propagation. Most begonias can be started from either stem cuttings or leaf cuttings.

Stem Cuttings

This method works best for wax and cane-like begonias.

1. Cut a 4-inch piece of a healthy stem, making the cut just below a "node" (the bump where a leaf meets the stem).
2. Remove the lower leaves so you have a bare section of stem to insert into the soil.
3. Place the stem in a small pot of moist potting mix.
4. Keep the cutting in a warm, bright spot out of direct sun. Roots should form in 3 to 4 weeks.

Leaf Cuttings

This is a fascinating method used primarily for Rex begonias.

1. Take a healthy, mature leaf and flip it over.
2. Use a clean knife to make small nicks in the major veins on the underside of the leaf.
3. Lay the leaf flat on top of a tray of moist seed-starting mix, ensuring the nicks are in contact with the soil. You can use small pebbles to weigh the leaf down.
4. Cover the tray with a clear plastic bag to create a mini-greenhouse.
5. After a few weeks, tiny "baby" plants will begin to grow from each of the nicks in the leaf.

Dealing with Common Challenges

Even though begonias are generally easy to care for, you may occasionally run into a few issues. Most of these can be fixed by adjusting how you water or where the plant is sitting.

Yellowing Leaves

If the leaves turn yellow and feel mushy, the plant is likely getting too much water. Check the drainage holes in your pot and let the soil dry out a bit more between waterings. If the leaves are yellow but the soil is dry, the plant may need a bit more fertilizer.

Crispy Leaf Edges

Browning, crispy edges usually mean the air is too dry or the plant is getting too much sun. If the plant is in a pot, try moving it to a more shaded location. If you are growing begonias indoors, placing the pot on a tray filled with pebbles and water can help increase the humidity around the leaves.

Powdery Mildew

This looks like a dusting of white flour on the leaves. It usually happens when there is not enough air circulation or when the leaves stay wet for too long. Space your plants further apart and ensure you are watering only at the soil level. For persistent issues, a simple neem oil spray can often clear it up.

Pests

Outdoor begonias can occasionally attract slugs or snails, especially in damp, shady areas. You can protect your plants by using copper tape around pots or by applying a pet-safe slug bait. Indoor begonias may sometimes see mealybugs (which look like tiny bits of white cotton). These can be removed with a cotton swab dipped in rubbing alcohol.

What to Do Next:

• Monitor your plants weekly for any changes in leaf color or texture.
• Ensure your watering routine focuses on the soil, not the foliage.
• If a plant looks crowded, prune it back to improve air movement.

Overwintering and Storage

Begonias are tropical, so they will not survive a freezing winter outdoors in most of the United States. However, you do not have to buy new plants every year. You can bring them inside to enjoy as houseplants or store the tubers for the following spring. If you need help with shipping timing for spring planting, see Shipping Information.

Storing Tuberous Begonias

When the leaves begin to turn yellow in the fall, stop watering the plant. After the first light frost kills the top growth, dig up the tubers.

1. Cut off the stems, leaving about an inch attached to the tuber.
2. Let the tubers dry in a cool, shaded area for a few days until the soil can be easily brushed off.
3. Place the dry tubers in a box filled with peat moss, sawdust, or shredded paper.
4. Store them in a cool (40–50°F), dark, and dry place like a basement or crawlspace.
5. Check them once a month to make sure they are not shriveling or rotting.

Bringing Plants Indoors

Wax, Rex, and Angel Wing begonias make excellent houseplants. Before the first frost, move the pots inside to a bright window that does not get direct, scorching sun. The plants may drop a few leaves as they adjust to the lower humidity of your home, but they will soon settle in. Reduce your watering and stop fertilizing during the winter months when the plant’s growth naturally slows down. For help choosing quality plants, you can also review About Us.

Conclusion

Growing begonia flowers is one of the easiest ways to transform a shady corner into a vibrant oasis. By matching the right variety to your space and focusing on the basics of well-draining soil and consistent moisture, you can enjoy a full season of tropical beauty. Whether you choose the massive blooms of tuberous types or the artistic foliage of the Rex varieties, these plants offer a rewarding experience for gardeners of all levels.

At Longfield Gardens, we take pride in helping you find the highest quality plants to make your garden dreams a reality. We stand behind the quality of our tubers and are here to support you as you watch your garden grow. With a little care and the right timing, your begonias will be a highlight of your landscape year after year.

• Select the right variety (blooms vs. foliage) for your garden goals.
• Wait for warm weather and warm soil before planting outside.
• Prioritize drainage to keep stems and roots healthy.
• Fertilize regularly to sustain constant flowering through the fall.

"The secret to beautiful begonias is simple: give them a warm, shaded spot, keep their soil moist but not soggy, and they will reward you with color all summer long."

Ready to start your shade garden transformation? Order your favorite begonia tubers today and get ready for a spectacular season of blooms.

FAQ

Can begonias grow in full sun?

Most begonias prefer shade or partial shade, but wax begonias are an exception. They are quite hardy and can tolerate more direct sunlight, especially if the soil is kept consistently moist. However, in very hot climates, even wax begonias will perform better with some afternoon shade to prevent leaf scorch.

How often should I water my begonias?

You should water begonias whenever the top inch of soil feels dry to the touch. For plants in containers, this might be every day during the heat of summer. For plants in the garden, it might be two or three times a week. Always water at the base of the plant to keep the foliage dry and prevent disease.

Why are the flowers falling off my begonia?

It is natural for old flowers to fall off as they finish blooming. However, if healthy-looking flowers are dropping, it may be due to extreme heat, underwatering, or a sudden change in environment. Ensure your plant is in a shaded spot during the hottest part of the day and that the soil stays evenly moist.

Are begonias toxic to pets?

Yes, begonias contain calcium oxalate crystals, which are toxic to dogs and cats if ingested. The most toxic part of the plant is the underground tuber or roots. It is best to plant begonias in areas where pets do not browse or to keep them in hanging baskets out of reach.