What are heirloom pumpkin seeds?

Heirloom pumpkin seeds are open-pollinated varieties that have been passed down through generations. Unlike hybrids, you can save seeds from heirloom pumpkins and grow the same variety year after year. All our seeds are non-GMO and open-pollinated.

What growing zone are your seeds tested in?

All our seeds are grown and tested on our Zone 6b homestead in Newton, Kansas. Most of our varieties also perform well in Zones 5-9. Each product listing includes specific growing zone recommendations.

Do you offer free shipping?

Yes! We offer free shipping on orders of $35 or more. Orders under $35 pay USPS calculated shipping. Seeds ship via USPS First Class, and coffee ships fresh within 48 hours of roasting.

What makes your coffee different?

Our coffee is roasted in small weekly batches, Prairie Blaze right here in Kansas, and every 8 oz bag is packed and shipped fresh from Newton. Available in Prairie Sunrise (light roast) and Prairie Blaze (bold medium roast), ground or whole bean.

Are your pumpkin seeds vine borer resistant?

Many of our Cucurbita moschata varieties are naturally resistant to squash vine borers, including Seminole Pumpkin, Long Island Cheese, Tromboncino, and Mrs. Amersons. We highlight vine borer resistance on each product page.

Prairie Sunflower Collection - sunflower garden planting - heirloom sunflower seeds

Prairie Sunflower Collection - sunflower field - Kansas heirloom sunflower collection

Prairie Sunflower Collection - harvested sunflower seeds - open pollinated seed saving

Prairie Sunflower Collection - mature sunflower bloom - Mammoth variety Kansas grown

Spring garden kit seed packets display with variety labels

Seeds

Mammoth Sunflower Seeds, Giant Heirloom Open Pollinated

$4.99

🌱 Open Pollinated 🧪 Germination Tested 📦 Ships in 1-2 Days

Free shipping on orders $35+ · Satisfaction guaranteed

Mammoth Sunflower Seeds, the classic towering heirloom with single golden heads up to 12 inches across. Open-pollinated, pollinator-favorite, and unbeatable for edible seed harvest and backyard showstoppers.

🌱 Free Shipping on Orders $35+, ships from Newton, Kansas.

The original giant sunflower. Mammoth grows 9 to 12 feet tall on a single thick stalk, crowned with one enormous golden-yellow flower head that can reach 12 inches or more across. Bees and pollinators swarm it all summer, and the plump gray-striped seeds are prized for roasting, bird feeding, or saving for next year.

Type: Annual (Helianthus annuus)
Height: 9 to 12 ft
Bloom: Single large head, up to 12 in diameter
Color: Golden yellow
Days to bloom: 80 to 90 days
Sun: Full sun
Seed count: choose 20 seeds or 50 seeds per packet

Direct sow after last frost, 1 inch deep, 18 to 24 inches apart. Stake tall stalks in windy Kansas gardens. Open-pollinated, save your own seed for next season.

🌻 See our Kansas growing guide →

Growing Guide: How to Grow Sunflowers in Kansas: A Zone 6b Guide - planting dates, spacing, watering, and harvest tips for Zone 6b.

Shipping & Satisfaction

We ship seeds and coffee via USPS from Newton, Kansas. Orders typically ship within 1-2 business days.

Seeds: Flat-rate shipping. Ships year-round.

Coffee: Freshly roasted and shipped weekly.

Not happy? Contact us and we will make it right.

Growing Tips

Each seed packet includes detailed growing instructions. For additional help, visit our Growing Guides or reach out to us directly.

Grown & Tested in Kansas Zone 6b 100% Open-Pollinated & Non-GMO Free Shipping Family Homestead · Newton, KS

Mammoth Sunflower Seeds, Giant Heirloom Open Pollinated

10% Off Your First Order