Sunflower Mammoth Organic Flower Seeds

SUNFLOWER ‘Mammoth’ Organic Flower Seeds

Botanical Name: Helianthus annuus

• Giant sunflower variety producing massive, single-headed blooms up to 30–40 cm across.
• High-yielding plant ideal for garden displays, cut flowers, and harvesting seeds for snacking or oil.
• Sturdy stems support heavy flower heads, ensuring reliable growth even in windy conditions.
• Thrives in full sun and fertile, well-drained soil with regular watering.
• Attracts pollinators including bees and butterflies, enhancing your garden ecosystem.
• Continuous flowering and seed production when old heads are harvested promptly.

Plant Details

• Plant Type: Annual flowering plant; giant sunflower
• Plant Height: 250–350 cm tall; spreads 60–90 cm wide

Sowing Information

• Germination: 7–14 days
• Depth: 2–3 cm deep
• Position: Full sun
• Sow Where: Direct sow into garden beds or large pots after frost risk
• Soil Type: Well-drained, fertile soil enriched with organic matter
• Spacing: 60–90 cm between plants

Growing Tips

• Water deeply during early growth to establish strong roots and sturdy stems.
• Stake plants if necessary to support the weight of giant flower heads.
• Remove old flower heads to encourage new blooms and prevent self-seeding if desired.
• Fertilize lightly throughout the season to maintain steady growth and seed production.

Harvest

Flowers typically appear 90–110 days after sowing. Cut blooms when petals are fully open for fresh arrangements, or harvest seeds when the back of the flower head turns brown. Regular harvesting encourages continued flowering and seed production.

When to Sow Sunflower Mammoth in Your Climate