How to Grow Sunburst Supreme
Sunburst Supreme
Helianthus annuus 'Sunburst Supreme'
flowerSunburst Supreme is a vibrant annual sunflower cultivar known for its large, fully double golden-yellow blooms that can reach 5-6 inches in diameter. This dramatic variety produces abundant flowers on sturdy stems, making it excellent for cut flowers and garden displays. It combines the cheerful appeal of sunflowers with a luxurious, pompom-like flower form.
When should you plant Sunburst Supreme in your zone?
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Example Sunburst Supreme timeline · Pittsburgh, PA (Zone 6b)
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Plant Sunburst Supreme
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 Sunburst Supreme blooms
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Sunburst Supreme dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-10; annual grown everywhere but performs best in zones 5-8
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Germination & Seedling
2-3 weeksSeeds sprout within 7-10 days. Seedlings emerge with two cotyledons and develop their first true leaves.
Keep soil warm (65-75°F) and evenly moist. Thin seedlings to 12 inches apart once they have 2-3 true leaves. Provide bright light to prevent leggy growth.
Vegetative Growth
4-6 weeksPlant develops sturdy stems, multiple leaves, and grows 18-36 inches tall depending on variety maturity. Foliage is thick and healthy.
Water deeply but less frequently to encourage strong root systems. Stake or support taller varieties if necessary. Monitor for pests. Apply balanced fertilizer every 3-4 weeks.
Bud Formation
1-2 weeksTerminal bud appears at the top of the main stem, with secondary buds developing along the stem. Buds are compact and greenish.
Reduce nitrogen fertilizer to encourage flowering rather than excessive foliage. Ensure consistent watering. Stake plants if needed for support.
Flowering
3-4 weeks per flowerLarge double golden-yellow pompom-like flowers open, displaying the characteristic dense petals of Sunburst Supreme. Main flower can be 5-6 inches across.
Continue regular watering at the base to avoid wetting flowers. Deadhead spent secondary flowers to extend blooming. Cut flowers for arrangements to stimulate more blooms.
Seed Development & Decline
2-3 weeksDouble flowers do not produce viable seeds (sterile cultivar). Plant gradually declines as flowering energy is expended.
Continue deadheading to extend the flowering period. Allow last flowers to remain if desired for ornamental seed heads. Plant will eventually senesce.
Common Pests
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Hand-pick insects; use neem oil spray; encourage natural predators like parasitic wasps
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Spray with strong water stream; apply insecticidal soap; use neem oil; introduce ladybugs
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Place cardboard collars around young stems; remove garden debris; apply beneficial nematodes to soil
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Increase humidity with regular misting; use neem oil or miticide; remove heavily infested leaves
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Improve air circulation; apply sulfur dust or fungicide; remove infected leaves; avoid overhead watering
Uses
Cut flowers for arrangements
CulinarySunburst Supreme's large double blooms make stunning centerpieces and floral arrangements. The fully double form provides dramatic, long-lasting flowers ideal for weddings and special events. [source]
Garden ornament and visual appeal
WildlifeThese cheerful golden flowers brighten gardens and attract pollinators and beneficial insects. The dense pompom structure provides visual interest in borders and cottage gardens. [source]
Dried flower crafts
HouseholdThe fully double flowers can be dried for use in arrangements, wreaths, and craft projects. They retain their golden color and structure well when properly dried. [source]
Floral design and floristry
CraftProfessional florists and wedding planners prize Sunburst Supreme for its consistency, size, and longevity. It works beautifully in contemporary and traditional arrangements. [source]
Harvest Tips
Cut flowers in the early morning when stems are fully hydrated. Harvest when the outer ring of petals is opening but the center is still somewhat closed for longest vase life (7-10 days). Use a sharp knife and cut at an angle. Remove lower leaves below the water line to prevent bacterial growth.
Fun Facts
- 🌱 Sunburst Supreme is a sterile double-flowered cultivar, meaning it doesn't produce viable seeds—all flowering energy goes into creating those gorgeous pompom blooms instead of seed production.
- 🌱 The fully double 'Sunburst' type of sunflowers was developed in the Netherlands and has become increasingly popular in the cut flower industry over the past two decades.
- 🌱 Sunflowers are heliotropic when young, tracking the sun across the sky during the day and returning to face east at night—a behavior called heliotropism.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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