Sunflower Mammoth Grey Striped brings towering height and giant flower heads to the garden. This non-GMO heirloom reaches approximately 8–12 feet tall and produces impressive yellow blooms measuring about 10–12 inches across. The large seeds develop distinctive grey-striped shells, making the mature heads a rewarding harvest for gardeners and a welcome food source for birds. Each packet contains 200 seeds for planting.

Germination Rate: 91%. Test Date: 8/25. AWSC.

Texas Minimum Germination Rate: None

Why Choose Sunflower Mammoth Grey Striped?

• Heirloom Variety: Grow a traditional giant sunflower with dramatic garden presence and large striped seeds.
• Non-GMO Seeds: A non-GMO choice for your home flower garden.
• Impressive Size: Tall stems and broad flower heads create a striking backdrop along sunny garden borders.
• Harvest Potential: Mature heads produce large seeds that can be collected for birds or prepared for the table after harvest.
• Wildlife Interest: Flowers offer a gathering place for visiting pollinators, while ripening seed heads attract birds.

Planting Tips for Success

• When to Plant: Direct sow after the last frost when the soil has warmed to at least 50°F. Use your local frost dates to plan planting.
• Sunlight: Choose full sun with at least 6–8 hours of direct light daily.
• Soil: Plant in well-draining soil, ideally with a pH of 6.0–7.5. Work compost into the planting area before sowing.
• Planting Depth: Sow seeds approximately 1 inch deep and keep the seedbed evenly moist during germination.
• Spacing: Allow 24–36 inches between plants to give these giant sunflowers room to develop. Crowding can reduce plant vigor and flower-head size.
• Watering: Water deeply around the root zone as plants grow. Avoid waterlogged soil and prolonged drying during flower and seed development.
• Support: Choose a sheltered position or stake tall plants in windy locations. Heavy seed heads can make mature plants top-heavy.
• Fertilizing: Use fertilizer according to soil-test results and label directions. Avoid excessive nitrogen, which encourages leafy growth.
• Bloom Time: The listing's approximate bloom time is 60 days; weather and growing conditions can affect timing. Mature seed harvest takes additional time after flowering.
• Harvesting: Allow seeds to fill and the back of the head to turn yellow-brown. Cut mature heads and finish drying in an airy, protected location before removing the seeds. Protect developing heads from birds if you want to keep the harvest.

Why Choose David's Garden Seeds®?

• Veteran-Owned: Supplying premium seeds since 2009.
• GO TEXAN Certified: Supporting local agriculture and communities.
• Integrity Pledge: David's Garden Seeds has taken the Seed Integrity Pledge.
• Great Customer Service: David answers all customer service questions, usually within a few minutes.

Ways to Use Mammoth Grey Striped Sunflowers

• Garden Backdrop: Plant along a sunny border where their height can stand behind shorter flowers without shading them.
• Wildlife Garden: Leave mature heads in place for birds to visit and feed.
• Harvested Seed Snacks: Collect mature seeds from the plants you grow, then dry, shell and roast them for snacking.
• Kitchen Crunch: Add hulled harvested seeds to salads, breads, granola or trail mix.
• Garden Learning: Follow the progression from a small planting seed to a towering plant, flower and mature seed head.

Order Mammoth Grey Striped Sunflower Seeds Today

Grow towering sunflowers and enjoy the beauty of giant blooms in your sunny garden.

Important Disclosures

• Variety Disclaimer: Plant height, bloom size, flowering time and seed yield vary with climate, soil and growing conditions.
• Seed Storage: Store planting seeds in a cool, dry place away from direct sunlight and moisture. Germination can decline with age and poor storage conditions.
• Planting Zones: Grow as a warm-season annual after frost danger has passed. Local frost dates and season length are more useful for planting schedules than perennial hardiness zones.
• Planting Seeds: This packet is sold for planting, not eating. Culinary suggestions refer to mature seeds harvested from the plants you grow.

Grow something beautiful. Grow something delicious. Grow with David's Garden Seeds®.