Mammoth Sunflower Seeds – Heirloom Non-GMO Giant Variety for Roasting Seeds, Bird Feed & Dramatic Garden Displays
Heirloom - Non-GMO - Reliable Germination
Mammoth Sunflower Seeds – Heirloom Non-GMO Giant Variety for Roasting Seeds, Bird Feed & Dramatic Garden Displays - 1 Packet is backordered and will ship as soon as it is back in stock.
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Grow towering, show-stopping blooms with Mammoth Sunflower Seeds, a classic heirloom non-GMO variety that combines ornamental beauty with practical harvest value. These single-stem giants reach 10–12 feet tall, producing massive golden-yellow flower heads up to 12 inches wide—a true centerpiece in any garden.
Beautiful and Productive Giants:
- Grows 10–12 ft tall with strong, sturdy stalks.
- Produces large flower heads packed with hundreds of oil-rich, edible seeds.
- Ideal for roasting, snacking, bird feed, or seed saving for next season.
- Excellent for pollinator support, wildlife feeding, or use as a natural privacy screen.
Why Gardeners Love Mammoth Sunflowers:
- Classic Giant Variety – A traditional favorite for its height, size, and yield.
- High-Yield Seed Harvest – Produces plump, nutritious seeds for humans and wildlife alike.
- Bold Garden Focal Point – Bright golden blooms command attention in borders or homestead gardens.
- Easy & Reliable Growth – Thrives in full sun and well-drained soil across USDA Zones 3–11.
- Drought Tolerant – Strong, deep roots make it a resilient choice for summer heat.
How to Grow Mammoth Sunflowers:
- When to Plant: Sow seeds directly outdoors after the last frost when soil has warmed to 60°F (16°C) or higher.
- Soil & Sun: Prefers well-drained soil and full sun; amend with compost for best growth.
- Spacing: Allow 18–24 inches between plants to give stalks room to grow tall and strong.
- Watering: Water deeply once or twice a week to promote deep root systems.
- Bloom & Harvest: Expect blooms mid-summer, with seed heads maturing late summer through early fall.
Harvest & Use:
After petals fade, let heads dry naturally on the stalk until seeds loosen easily. Harvest and roast seeds for snacking, save for next year’s planting, or leave them out for birds and pollinators to enjoy. With its towering presence and generous yield, Mammoth Sunflower is a must-have for gardeners seeking both impact and sustainability.
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Mammoth Sunflower Seeds – Heirloom Non-GMO Giant Variety for Roasti...
Heirloom Flower Seeds
All of our seeds are open-pollinated, non-GMO, heirloom varieties with tested germination rates
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Why Choose Survival Garden Seeds
At Survival Garden Seeds, we believe in preparing today for tomorrow’s peace of mind. That’s why we offer only heirloom, non-GMO, and untreated seeds you can trust to nourish your family and support a sustainable lifestyle. As a family-owned American company, we’re committed to providing seeds that grow strong and true—helping you cultivate health, resilience, and beauty in your garden.
Print Your Own Gift Tags & Envelopes
Spruce up your seed gift with free downloadable print-your-own gift tags & envelopes.
Frequently Asked Questions
Are your seeds heirloom and open-pollinated?
Are your seeds heirloom and open-pollinated?
Yes. All of our seeds are heirloom, open-pollinated varieties, which means they can produce seeds that grow true to type and are suitable for seed saving.
You can learn more about open-pollinated, heirloom, and non-GMO seeds in our Survival Garden Training blog.
Are your seeds non-GMO?
Are your seeds non-GMO?
Yes. All Survival Garden Seeds are 100% non-GMO. Our seeds are open-pollinated heirloom varieties and are never genetically modified.
Are your seeds treated with chemicals?
Are your seeds treated with chemicals?
No. Our seeds are completely untreated and free from chemical coatings, fungicides, or synthetic treatments.
How do I know my seeds are fresh?
How do I know my seeds are fresh?
Every seed packet includes a packed-for date, and we germination-test each seed lot before packaging to ensure high viability.
What is the shelf life of these gardening seeds?
What is the shelf life of these gardening seeds?
Most seeds remain viable for 3 to 5 years or longer when stored properly in a cool, dry place away from light and moisture.
In what USDA hardiness zones can I grow your seeds?
In what USDA hardiness zones can I grow your seeds?
Our varieties are selected to grow successfully across USDA Hardiness Zones 3 through 10. Each packet includes variety-specific planting guidance and germination tips.
