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.
Frequently Asked Questions
What are heirloom seeds?
What are heirloom seeds?
Heirloom seeds are the types of seeds your grandparents grew. These varieties have been passed down from generation to generation. They’re old reliable open-pollinated varieties that aren’t typically grown commercially. Instead, they have a rich history that predates modern breeding techniques.
You can learn more about open-pollinated, heirloom, and non-GMO seeds in our Survival Garden Training blog.
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 you receive viable, high-quality seeds that are ready to grow.
Are your seeds treated?
Are your seeds treated?
No, we do not pre-treat our farmer seeds. All of our garden seeds for sale are untreated, open-pollinated, non-GMO, and heirloom varieties. They are kept in temperature-controlled cooler storage until they are packed and shipped to keep them pest and disease-free.
In what zones can I grow your seeds?
In what zones can I grow your seeds?
The seeds in our collections are specifically chosen from varieties that can be successfully grown from Zone 3 to Zone 10 USDA Hardiness Zones. However, individual varieties have specific needs to thrive in different environments. Each seed pack has optimal temperatures for germination and instructions on seed starting. Consult local frost dates to plan your garden and get the most out of your seeds.
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. Check your seed packet for specific varieties. For best results, keep your seeds in a cool, dry place away from direct sunlight and moisture. Store them in an airtight container in a consistent temperature environment—a refrigerator or cool basement works well. Proper storage helps maintain germination rates and extends seed life well beyond the packed date.
Where are Survival Garden Seeds sourced?
Where are Survival Garden Seeds sourced?
The majority of our seeds are sourced in the United States, with a few exceptions when the seed is difficult to source domestically. Whenever we do have to source outside of the US, we ensure our seeds are safe to grow, non-GMO varieties that meet our standards for germination and reliability.
