If you want a flower that delivers a spectacular show of color from spring until frost, look no further than the double begonia. With their vibrant and cascading blooms, these plants are true garden champions, perfect for pots, baskets, and beds.
Their flowers are packed with layers of petals, resembling tiny roses or camellias. This gives them a lush, full appearance that single-flowered begonias just can’t match. The “double” in their name refers directly to this beautiful, multi-petaled bloom structure.
They thrive in similar conditions to other begonias but offer twice the visual impact. Whether you’re a seasoned gardener or just starting, you can grow these successfully. This guide will walk you through everything you need, from choosing the right type to keeping them flowering for months.
Double Begonia – Vibrant And Cascading Blooms
This specific type of begonia is celebrated for its remarkable flowers. The blooms are not just colorful; they are complex, textured, and incredibly prolific. When grown in hanging baskets or elevated containers, their stems spill gracefully over the edges, creating a waterfall of color.
The color range is exceptional. You’ll find shades of vibrant pink, deep red, sunny yellow, crisp white, and soft apricot. Many varieties have blooms that seem to glow against the dark green or bronze foliage. This combination of form and color is what makes them so special for container gardening.
Why Choose Double Begonias for Your Garden?
There are several compelling reasons to make these plants a staple in your outdoor space. First, they are incredibly long-blooming. Once they start in late spring, they rarely take a break until the first hard frost arrives.
Second, they are remarkably low-maintenance for such a showy plant. They don’t require deadheading (removing spent flowers) to keep blooming, which saves you a lot of time. Their natural habit is to stay full and bushy without much pruning from you.
- Non-Stop Color: They provide a reliable display for your patio, porch, or garden border all season long.
- Versatile Placement: They perform brilliantly in partial shade, a condition where many other flowering plants struggle.
- Pest Resistance: Deer and rabbits typically leave them alone, and they have few serious disease problems.
- Adaptable: They grow equally well in containers, window boxes, and directly in the ground.
Main Types of Double Begonias
Not all double begonias are the same. Understanding the main groups will help you pick the perfect plant for your needs. The two most common types you’ll encounter are tuberous and fibrous-rooted.
Tuberous Double Begonias
These grow from a bulb-like tuber. They are famous for their large, often dinner-plate-sized flowers that hang beautifully in baskets. In the fall, the plant dies back, and you can store the tuber indoors over winter to replant next spring. They prefer cooler summers and consistent moisture.
Fibrous-Rooted Double Begonias (Like Double Begonia semperflorens)
Often sold as “wax begonias” or “bedding begonias,” these have a traditional root system. They are typically grown as annuals, though they can be perennial in warm climates. The flowers are slightly smaller than tuberous types but are produced in massive quantities. They are exceptionally heat and sun tolerant once established.
Finding the Perfect Spot: Light and Location
Getting the light right is the single most important factor for success. Too much sun can scorch the leaves and fade the flowers. Too little sun leads to leggy growth and few blooms.
The ideal condition for most double begonias is bright, filtered light or partial shade. Think of a spot that gets morning sun and afternoon shade, or light that filters through a tree canopy. Some fibrous varieties can handle full morning sun with afternoon shade, especially in cooler climates.
- North or East-facing exposures are often ideal.
- If you only have a sunny spot, provide shade during the hottest part of the day, or choose a sun-tolerant fibrous type.
- Indoors, a bright window without direct, hot sun is perfect.
Planting Your Double Begonias for Success
Proper planting gives your begonias a strong start. Whether you’re planting tubers, seedlings, or mature plants, a little care at the beginning pays off all season.
Planting Tubers
Start tuberous begonia tubers indoors about 8 weeks before your last frost date. Plant them in a shallow tray of moist potting mix, hollow side up, just barely covered. Place them in a warm, bright spot. Once shoots are a few inches tall and all danger of frost has passed, you can transplant them outside.
Planting in Containers
- Choose a pot with excellent drainage holes. Begonias hate soggy roots.
- Use a high-quality, lightweight potting mix. A mix for African violets works very well because it’s porous.
- Plant at the same depth the plant was growing in its nursery pot. Firm the soil gently around the roots.
- Water thoroughly after planting to settle the soil.
Planting in the Garden
Wait until the soil is warm and the weather is settled. Amend the planting area with compost to improve drainage. Space plants according to their mature size, usually 8 to 12 inches apart, to allow for good air circulation which prevents disease.
Watering and Feeding: The Key to Continuous Blooms
Your watering routine will make or break your begonias. The goal is consistent moisture, not extremes. Let the top inch of soil dry out slightly between waterings. Then, water deeply until it runs out the bottom of the pot.
Overwatering is a common mistake. It leads to root rot, which is often fatal. Always check the soil with your finger first. Plants in hanging baskets may need water daily during hot, windy weather, while those in the ground may need it less frequently.
For feeding, a balanced approach works best. Use a water-soluble fertilizer formulated for flowering plants. Apply it at half-strength every two weeks during the growing season. Too much nitrogen will give you lots of leaves but few flowers, so a fertilizer with a slightly higher phosphorus number (the middle number) is beneficial.
Keeping Them Healthy and Beautiful
While low-maintenance, a few simple care tasks will keep your plants in peak condition. Good grooming encourages more flowering and prevents problems.
- Pinching: When plants are young, pinch off the very tip of each stem. This encourages branching, leading to a bushier plant with more flower sites.
- Cleaning: Occasionally remove any yellowing or dead leaves from the base of the plant to improve air flow and appearance. You generally don’t need to remove spent flowers; they fall off cleanly on their own.
- Pest Watch: Keep an eye out for mealybugs or whiteflies, especially on indoor plants. A strong spray of water or insecticidal soap usually takes care of them.
Overwintering Your Plants
You don’t have to say goodbye to your begonias at the end of the season. Tuberous types can be stored, and fibrous types can be brought indoors.
For tuberous begonias: After the first frost blackens the foliage, cut the stems back to about an inch. Carefully dig up the tubers, let them dry for a week, then brush off the soil. Store them in a box of dry peat moss or sand in a cool, dark place (like a basement) over winter.
For fibrous begonias: Before frost, you can take cuttings to root new plants, or dig up the entire plant, pot it, and bring it indoors to a sunny window. Treat it as a houseplant, watering sparingly through the winter.
Design Ideas for Maximum Impact
The cascading habit of these plants makes them a premier choice for vertical interest. Use them to add layers and color at eye level and above.
- Hanging Baskets: Plant three to five tubers or seedlings in a 12-inch basket for a full, overflowing display. Mix colors or stick to a single hue for a bold statement.
- Container Combinations: Use a double begonia as the “thriller” or “spiller” in a mixed container. Pair them with foliage plants like sweet potato vine or coleus, and filler flowers like lobelia.
- Shade Gardens: Brighten up a dark corner of your garden by planting a group of them in the ground. Their flowers will light up the space.
- Patio Accents: Place pots of them on pedestals or shelves to bring the color up to where you sit and relax.
Troubleshooting Common Problems
Even with great care, you might encounter an issue. Here’s how to quickly identify and fix common problems.
Yellowing Leaves: This is most often caused by overwatering. Check your watering habits and ensure the pot drains freely. It can also be a sign of underfeeding; try a light application of fertilizer.
Brown, Crispy Leaf Edges: Usually a sign of too much direct sun or wind exposure. Move the plant to a more sheltered location with gentler light.
Dropping Buds: Sudden changes in temperature, light, or moisture levels can cause bud blast. Try to keep the plant’s environment as consistent as possible, and avoid letting it dry out completely when in bud.
Powdery White Residue on Leaves: This is powdery mildew, a fungal disease. Improve air circulation around the plant, avoid wetting the foliage when watering, and treat with an organic fungicide if needed.
FAQ About Double Begonias
Q: How much sun do double begonias need?
A: They prefer bright, indirect light or partial shade. Morning sun with afternoon shade is perfect. To much hot afternoon sun can damage them.
Q: Are double begonias annuals or perennials?
A: They are tender perennials, meaning they are often grown as annuals in colder climates. In frost-free zones, they can live for several years. Tuberous types can be stored over winter.
Q: Why is my double begonia not flowering?
A: The most common reasons are too much shade, over-fertilizing with nitrogen, or underwatering. Ensure it gets enough light, switch to a bloom-boosting fertilizer, and keep the soil consistently moist.
Q: Can I grow double begonias from seed?
A: Yes, but it’s a slow and somewhat challenging process for beginners. The seeds are dust-like and need very specific conditions to germinate. Most gardeners start with tubers or purchase young plants.
Q: What’s the difference between double and single begonias?
A: It’s all about the flower structure. Single begonias have a simple row of petals, while double begonias have many layers of petals, creating a fuller, rose-like bloom. The care requirements are very similar for both.
Q: How often should I water my potted begonia?
A: Water when the top inch of soil feels dry. This could be every other day in hot summer weather or twice a week in cooler conditions. Always water deeply until it drains from the bottom.
Adding double begonias to your garden is a surefire way to enjoy vibrant color with minimal fuss. Their ability to thrive in shade and their long blooming period make them incredibly valuable. With the right light, consistent water, and occasional food, you’ll be rewarded with a stunning cascade of flowers that lasts for months. Start with one hanging basket this season, and you’ll likely find yourself adding more next year.