Organic Russian Mammoth Sunflower Seeds For Yards

The Russian Mammoth Sunflower delivers dramatic vertical presence to gardens, maturing between ten and fifteen feet with expansive golden-yellow blooms that reach up to fourteen inches across. This open-pollinated tender annual produces substantial seeds and thrives in well-draining soil under full sunlight. Reintroduced to the United States in 1880 following Russian breeding efforts, it builds structural height without requiring intensive maintenance.

Begin cultivation by sowing seeds in spring after frost ends, planting them half an inch deep into prepared beds while keeping the soil consistently moist until sprouting completes in seven to fourteen days. Thin seedlings carefully to ensure adequate airflow and adjust final height according to local climate variations. Growers in USDA Zones three through ten easily pair this resilient crop with other Flower Seeds for structured seasonal layouts.

📋 Product summary:

• Betanic classification: Helianthus annuus tender annual
• Mature height range: ten to fifteen feet
• Flower diameter: ten to fourteen inches wide
• Planting window: direct sow in spring
• Germination period: seven to fourteen days
• Recommended spacing: leave ample room for airflow
• Packaging formats: individual packets and bulk options