Description
Large Grey Striped Sunflower Seeds 6140. Open Pollinated. Annual.
Approx. 50 seeds/pkt (8-10 seeds/gram)
Also known as Mammoth Grey Stripe, this legendary heirloom is the definitive choice for gardeners aiming to grow a fall fair champion. These giants produce massive, single yellow blooms ranging from 25–35 cm in diameter, supported by sturdy, tree-trunk-like stems that can tower to 3 m or more in height. Beyond their impressive stature, these sunflowers are the best variety for producing large, meaty seeds perfect for roasting at home or providing a natural winter feast for local birds.
Quick Seed Details
-
Product Code: 6140
-
Type: Open Pollinated Annual Sunflower
-
Flower Size: 25–35 cm (Giant)
-
Plant Height: 3 m+
-
Light Requirement: Full Sun
-
Features: Massive seed production; edible seeds; a standout for children’s gardens and competitions.
What you need to know to Plant & Grow
Sunflowers are famously easy to grow, though these giants benefit from steady nutrition and wind protection.
-
Sow Outdoors: Direct sow in late May once the soil has warmed. Choose a sunny site with well-draining soil and sow seeds 6–12 mm deep and 7.5–10 cm apart.
-
Thinning: Once established, thin or transplant seedlings to 30–45 cm apart to allow room for their massive root systems.
-
Sow Indoors (Optional): Start 2–3 weeks early using plantable peat pots or Jiffy-7s at 21°C. Sunflowers have sensitive taproots, so using pots that go directly into the ground is essential.
-
Germination: Fast-acting, typically occurring in 5–10 days.
-
Care: Keep plants evenly watered. For maximum height, fertilize twice during the season with a granular fertilizer (like 15-5-15).
-
Support: Due to the immense weight of the ripening seed heads, staking is recommended for taller plants, especially in windy areas.
Why Large Grey Striped Sunflower Seeds belong in Your Garden
Part of our Urban Garden Collection, the Large Grey Striped sunflower is more than just a plant—it’s a backyard landmark. It provides a stunning vertical accent that can act as a natural privacy screen or a majestic backdrop for shorter flowers. Watching these giants track the sun across the sky is a summer highlight, and the high-protein harvest at the end of the season ensures your garden continues to support local wildlife long after the blooms fade.
