• Close-up of mammoth grey stripe sunflower seeds harvested from large blooms - HarvestNest Seeds
  • Giant mammoth sunflower growing outdoors -HarvestNest Seeds
  • Mammoth Grey Stripe sunflower with large yellow bloom and grey striped seeds in bowl, grown from giant sunflower seeds for home gardens
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HarvestNest Seeds

50 Mammoth Grey Stripe Sunflower Seeds – Giant Heirloom Sunflowers

50 Mammoth Grey Stripe Sunflower Seeds – Giant Heirloom Sunflowers

$10.95 USD
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Trusted by home gardeners across the USA 🌿

Grow impressive giant sunflowers with Mammoth Grey Stripe Sunflower Seeds. This classic heirloom variety produces towering plants with huge golden-yellow blooms and large grey-striped seeds that are perfect for snacking, bird feed, and planting.

Mammoth sunflowers can grow 10–14 feet tall with flower heads up to 12 inches wide, making them a stunning centerpiece for gardens, borders, and pollinator spaces. These easy-to-grow sunflowers attract bees, butterflies, and birds, helping support a thriving garden ecosystem.

Perfect for home gardeners, kids' gardening projects, and sunflower lovers.

🌿 Why Gardeners Love Mammoth Sunflowers

✅Produces giant sunflower heads
✅Plants can grow 10–14 feet tall
✅Large edible grey-striped seeds
✅Attracts birds, bees, and pollinators
✅Perfect for borders and garden backdrops
✅Easy to grow and beginner-friendly

📋 Plant Details

  • Botanical Name: Helianthus annuus
  • Variety: Mammoth Grey Stripe
  • Plant Type: Annual flowering plant
  • Mature Height: 10–14 feet
  • Flower Size: Up to 12 inches wide
  • Sunlight: Full Sun
  • Soil: Well-drained soil
  • Days to Maturity: 80–100 days
  • Hardiness Zones: 3–10

🌱 Growing Instructions

  1. Sow seeds directly outdoors after the last frost.
  2. Plant seeds 1 inch deep in loose, well-drained soil.
  3. Space plants 18–24 inches apart.
  4. Water regularly during early growth.
  5. Germination usually occurs within 7–10 days.

Provide support if growing in windy areas due to the tall stems.

🌻 Perfect For

  • Backyard gardens
  • Pollinator gardens
  • Bird-friendly gardens
  • Kids’ gardening projects
  • Garden borders and backdrops

❓ Frequently Asked Questions (FAQ)

How tall do Mammoth sunflowers grow?
These sunflowers can grow 10–14 feet tall under ideal conditions.

Are the seeds edible?
Yes, Mammoth Grey Stripe sunflowers produce large edible seeds.

Do sunflowers attract pollinators?
Yes, they attract bees, butterflies, and birds.

Are sunflowers easy to grow?
Yes, they are one of the easiest and fastest-growing garden flowers.

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