How to Grow Scarlet Begonia
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Scarlet Begonia
Begonia × semperflorens-cultorum
flowerScarlet Begonia is a compact, bushy tender perennial commonly grown as an annual bedding plant, known for its vibrant red flowers and attractive foliage. It produces continuous blooms from spring through frost and thrives in both sun and partial shade, making it exceptionally versatile for gardens and containers. The plant typically reaches 6-12 inches tall and is prized for its reliable performance and low maintenance requirements.
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Example Scarlet Begonia timeline · Pittsburgh, PA (Zone 6b)
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Plant Scarlet Begonia
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Scarlet Begonia blooms
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Scarlet Begonia dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Grown as an annual in zones 2-11; perennial in zones 10-11
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Seedling
2-3 weeksTiny seed leaves emerge and develop first true leaves; plants are delicate and low-growing
Maintain warm temperatures (70-75°F), high humidity, and bright indirect light. Keep soil moist. Provide gentle air circulation to prevent damping off.
Vegetative Growth
3-4 weeksPlant develops sturdy stems and glossy foliage; bushy shape begins to form with multiple leaf nodes
Pinch back growing tips to encourage bushiness. Ensure consistent moisture and fertilize every 2 weeks with balanced fertilizer. Gradually acclimate to outdoor conditions.
Flowering Onset
1-2 weeksFirst flower buds appear at stem tips; small red flowers begin to emerge
Continue pinching if necessary for fuller shape. Switch to slightly lower nitrogen fertilizer to promote blooms. Ensure adequate light.
Continuous Blooming
3-4 months until frostPlant produces abundant small red flowers continuously throughout growing season; compact, mounded form
Deadhead spent flowers to maintain appearance, though self-cleaning varieties require less maintenance. Water consistently and feed every 2-3 weeks. Monitor for pests.
Senescence
Variable, until first frostFlowering declines as temperatures drop below 50°F; foliage may fade
In frost-prone areas, plants will be killed by hard frost. Bring potted plants indoors before frost or save cuttings for winter propagation.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Improve air circulation, avoid wetting foliage, apply sulfur dust or fungicide spray if needed
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Remove infected plant parts, reduce humidity, improve drainage, apply fungicide if severe
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Increase humidity, spray with water to dislodge, use miticide or insecticidal soap if severe
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Use yellow sticky traps, spray with insecticidal soap or neem oil, remove heavily infested leaves
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Remove with alcohol-soaked cotton swab, spray with insecticidal soap or neem oil
Uses
Edible Flowers
CulinaryBegonia flowers are edible with a slightly tart, citrus-like flavor and are used as decorative garnishes in salads and desserts. The petals add both visual appeal and subtle flavor to culinary dishes. [source]
Bedding and Container Gardens
HouseholdScarlet Begonias are among the most popular bedding plants for flower beds, borders, and container gardens. Their continuous red blooms and compact habit make them ideal for formal designs and colorful displays. [source]
Indoor Houseplant
HouseholdIn cooler climates, potted Scarlet Begonias can be brought indoors for winter bloom or grown year-round as houseplants near bright windows. They add color and greenery to indoor spaces with minimal care. [source]
Flower Arrangements
CraftThe delicate red flowers and attractive foliage are popular in fresh flower arrangements and bouquets, adding bright color and texture. The flowers have reasonable vase life if cut and conditioned properly. [source]
Pollinator Support
WildlifeScarlet Begonia flowers attract hummingbirds and bees, making them valuable for supporting pollinator populations in gardens. The abundant nectar and continuous blooms provide extended food sources. [source]
Harvest Tips
Scarlet Begonias are grown for ornamental flowers and foliage, not harvest. Deadhead faded flowers to maintain appearance and encourage continuous blooming. Pinch back stems in early season to create bushier plants with more flowers. Take cuttings in late summer for winter propagation.
Fun Facts
- 🌱 Scarlet Begonias are hybrid plants (Begonia × semperflorens-cultorum) developed by crossing Begonia cucullata and Begonia schmidtiana in the 1800s, specifically bred for continuous blooming and compact growth.
- 🌱 The name 'semperflorens' means 'ever-flowering' in Latin, accurately describing their ability to bloom continuously from spring until hard frost without requiring deadheading in many cases.
- 🌱 Begonias have naturally asymmetrical leaves that grow in two different sizes on the same plant—a unique characteristic called 'heterophylly' that makes them botanically interesting beyond their ornamental appeal.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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