Russian Mammoth Sunflower Seeds (Organic)

The Russian Mammoth Sunflower is a majestic variety, towering up to 12 feet tall with massive, golden-yellow blooms. Each flower head can grow up to 14 inches across, providing a showy focal point in any garden. Known for its hardy nature, this sunflower thrives in full sun and well-draining soil, requiring minimal care to flourish. This fast-growing annual is suited for adding vertical interest to gardens or creating a vibrant sunflower wall. With its impressive size, vibrant flowers, and dual-purpose seeds, the Russian Mammoth Sunflower is a useful addition for gardeners of all levels.

Variety Details

• Botanical name: Helianthus annuus
• Plant type: Tender Annual
• Growth habit: Upright
• Crop category: Flower seed
• Flower character: The Russian Mammoth Sunflower is a majestic variety, towering up to 12 feet tall with massive, golden-yellow blooms.
• Recorded feature: Open-Pollinated
• Product format: Seed packet with a separately listed bulk option

Sowing & Growing

• USDA Zone: 3-10
• Plant In: Spring
• Planting Depth: 1/2"
• Days to Germinate: 7-14 Days
• Height At Maturity: 10'-15'
• Sun/Shade Requirements: Full Sun
• Water Needs: Moderate Water

Prepare a weed-reduced seedbed for Russian Mammoth Sunflower and use the recorded planting season, depth, and light requirements. Press shallow-sown seed into good soil contact and keep the seed zone from drying during establishment. Thin or transplant only when the growth habit and spacing call for it. Leave enough room for mature width and air movement. Bloom timing and final height can shift with sowing date, climate, soil, moisture, and competition, so use listed figures as planning ranges.

The Russian Mammoth Sunflower is the result of Russian breeding efforts and returned to the US in 1880 then as now under the name 'Russian Mammoth'.

This giant sunflower can grow easily to 10 inches in diameter.

Place Russian Mammoth Sunflower where its recorded height and growth habit fit the surrounding planting. Shorter companions can be positioned toward bed edges, while taller stems need room where they will not shade small seedlings too early. If cutting flowers, harvest with clean tools at the stage appropriate to the bloom form. If leaving flowers in place, observe how bloom sequence changes through the season and record which sowing date performed best at the site.

Explore related options in our Flower Seeds.