



Mammoth Grey Striped - Organic Sunflower Seeds
🚚 FREE SHIPPING for all orders over $79!
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.
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.
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
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.
I cannot wait to plant. Always such good quality.
My daughter ordered them and hasn’t planted them yet 😆
Do you have Christmas ferns? 🤔
Hi Linda! We're glad to hear that your daughter ordered the Mammoth Grey Striped Sunflower Seeds. Whenever you're ready to plant them, we're here to help if you have any questions. While we don't currently offer Christmas ferns, we do have a variety of other seeds and products to explore. Feel free to reach out if you need assistance or recommendations for your gardening endeavors!


