Mammoth Grey Striped - Organic Sunflower Seeds

SKU: FSU104
Open-Pollinated
Certified Organic
Heirloom
Price:$4.95
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Mammoth Grey Striped is a towering heirloom sunflower grown for its massive heads and heavy seed yield. With thick stalks that stretch up to 12 feet tall and blooms reaching a foot across, it makes a bold statement in the garden while drawing in pollinators by the dozen.

The large, striped seeds are excellent for roasting or feeding the birds once dried. First introduced in the late 1800s, this variety has remained a favorite for generations thanks to its reliability, beauty, and sheer size. Ideal for back borders, windbreaks, or adding a bit of spectacle to the summer garden.

Every order is packed with care by our small team in Pennsylvania and typically ships within 2–3 business days—often by the next business day. We ship throughout the United States using USPS and UPS.

Unopened items may be returned within 30 days of delivery. If an order arrives damaged, incomplete, or incorrect, please contact us so we can make it right.

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We stand behind every packet we sell. Our seeds are carefully selected, tested for germination, untreated, and guaranteed to be true to variety.

Your seeds are covered for one year from the date of purchase. If they fail to germinate under reasonable growing conditions, arrive damaged, or do not grow true to type, contact us and we’ll make it right with a replacement, store credit, or refund.

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Plant seeds directly in the garden after average last frost date when soil has warmed up. Optimum soil temperature for seed germination is 60-75°f. Succession plantings can be made every 1-2 weeks for continued harvest. Or, start seed indoors 3-5 weeks before transplanting into the garden. Transplant to the garden 1-2 weeks after your average last frost date. Sunflower is sensitive to transplant shock so carefully set in the garden.

Scientific name: helianthus annuss
Days to maturity: 85-95
Seed depth: 1/2"
Days to sprout: 10-14
Plant spacing: 18-24"
Row spacing: 24-36"
Light requirements: sunny
Plant height: 9-12'
Life cycle: annual
Frost hardy: no

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NON-GMO

Open-pollinated varieties for home gardens & seed saving

UNTREATED SEED

Safe seed, free from chemical treatments

HAND PACKED IN PA

Prepared with care by our family and small team

100% SATISFACTION

Third-party lab tested and backed by our guarantee.