How to Grow Sunflower
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🛠️ Supplies You'll Need
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🌿 Plant Overview
☀️ Growing Requirements
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Sun
Full Sun (6-8 hours)
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Water
Low-Moderate (1 inch/week)
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Spacing
18" apart
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Depth
1" deep
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Height
36-96"
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Germination
7-14 days
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Common Sunflower Varieties
Popular cultivars to look for at your local nursery or seed supplier.
Mammoth Russian
The classic giant sunflower reaching 10–12 feet with massive seed heads up to 14 inches across.
Autumn Beauty
Multi-stemmed branching variety with flowers in orange, burgundy, yellow, and bicolors.
Teddy Bear
Dwarf 2–3 foot sunflower with fluffy, pollen-free double flowers; great for cut arrangements.
Velvet Queen
Rich burgundy-red flowers on branching plants; stunning in arrangements and pollinator gardens.
Lemon Queen
Pale yellow multi-stemmed variety beloved by pollinators; excellent cut flower.
Days-to-maturity figures are approximate and vary by climate and growing conditions.
Common Sunflower Problems
What to watch for — and how to fix it before it spreads.
Pests
Adult beetles and larvae chew large, irregular holes in leaves; rarely fatal to mature plants.
Handpick in the morning; apply insecticidal soap for heavy infestations.
Larvae sever seedling stems at soil level overnight.
Place a cardboard collar around each seedling at transplanting; apply Bt to the soil.
Strip developing and mature seed heads before you can harvest.
Cover heads with paper bags or lightweight netting once petals drop.
Large colonies on stems and leaf undersides; usually controlled by natural predators.
Tolerate unless severe; spray with water or insecticidal soap; plant flowers nearby to attract beneficials.
Diseases
Yellow angular patches on upper leaf surface; gray mold on undersides; stunts young plants.
Improve airflow; avoid overhead watering; plant in full sun with good drainage.
White cottony mold on stems and head; causes stem collapse and head rot.
Rotate crops; improve drainage; avoid overhead irrigation.
Powdery orange pustules on leaf undersides; reduces photosynthesis but rarely kills mature plants.
Remove infected leaves; apply sulfur fungicide; choose resistant varieties.
Common Mistakes
Crowded sunflowers compete for light and produce smaller, weaker heads.
Space 18–24 inches apart for standard varieties; 6 inches for cut-flower crops.
Sunflowers are drought-tolerant once established; soggy soil rots seeds and seedlings.
Water seedlings lightly; once established, deep water weekly; let soil dry between waterings.
🌾 Seed Saving Guide
🟢 EasyWhen to Harvest Seed
Let seed heads dry on the plant until the back turns brown and papery. Cover with a mesh bag to prevent bird loss.
Processing
Rub seed head with palm over a bucket to release seeds, then spread to dry 1 week.
Seed Viability
Up to 3 years when stored cool, dark, and dry.
Pro Tip
Sunflowers cross freely — isolate by 1000 feet from other sunflower varieties for pure seed.
Seed Storage Supplies
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Raised Bed Planting Guides
A 4×8 bed fits 14 plants of Sunflower. See plant counts, spacing grids, and companion pairings for every bed size →
Sunflower Planting Calendar by Zone
Sunflower Planting Calendar by State
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Frequently Asked Questions
When should I plant Sunflower? +
Sow Sunflower seeds directly in the garden 1 weeks after your last frost date. Use the search on this page to find exact dates for your location.
How long does Sunflower take to grow? +
Sunflower typically matures in about 80 days from planting. Exact timing varies by variety, soil conditions, and local climate.
Should I start Sunflower indoors or direct sow? +
Sunflower does best when direct sown outdoors. Plant seeds directly in the garden at the appropriate time based on your local frost dates.
How much sun does Sunflower need? +
Sunflower requires full sun (6-8 hours) to thrive.
How far apart should I plant Sunflower? +
Space Sunflower plants 18 inches apart to allow adequate airflow and root development.
How much water does Sunflower need? +
Sunflower has low-moderate (1 inch/week) water needs. Consistent moisture is important especially during germination and early growth.
Can you save seeds from Sunflower? +
Yes — seed saving difficulty for Sunflower is rated easy. Let seed heads dry on the plant until the back turns brown and papery. Cover with a mesh bag to prevent bird loss. Rub seed head with palm over a bucket to release seeds, then spread to dry 1 week.
How long do Sunflower seeds last in storage? +
Properly dried and stored Sunflower seeds remain viable for up to 3 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.
Are Sunflower seeds open-pollinated? +
Yes — Sunflower is open-pollinated, meaning seeds saved from your harvest will grow plants true to the parent variety. This makes it an excellent candidate for building a self-sustaining garden.
About Sunflower
Iconic tall annual with large yellow blooms. Seeds attract birds and can be harvested for eating. Incredibly easy to grow from direct sow.
Expect your Sunflower to be ready for harvest in approximately 80 days from planting.
Use the search above or browse by zone or state to find the perfect planting dates for your location.