Sunflower Seeds, Mammoth Grey Striped

star-filled
4.3
31 Reviews
Sku:
#FL735
Min. seed count:
25
$3.00

Description

(Helianthus annuus). The standard giant variety that produces delicious seeds. The 10-foot plants produce heads that average 12 inches across. A statement plant in any garden!

  • Annual
  • 90-100 days to maturity
  • 8-12 hours of full sun
  • Sprouts in 7-14 days
  • Seed Depth: 1/2"
  • Plant Spacing: 18-24"
  • Ideal Temperature: 65-75 F
  • Frost Hardy: No

Growing Tips, Tricks and FAQs

Growing Tips

Mammoth Grey Striped is a towering heirloom sunflower, ideal for producing edible seeds and for attracting pollinators like bees. For the best growth, plant it in full sun and nutrient-rich, well-draining soil​. Water regularly to ensure moderate soil moisture.

When to Grow

Direct sow Mammoth Grey Striped sunflower seeds after the danger of the last frost has passed, when soil temperatures are above 60 F. In most areas, this is typically in late spring. You can also start indoors 2-3 weeks before the last frost, and carefully transplant seedlings afterwards.

How to Sow and Plant

Plant seeds 1/2 inch deep and space them 18-24 inches apart for maximum growth. Ensure the soil is well draining and rich in organic matter like compost. Once planted, water thoroughly to help the seeds settle, and thin seedlings to one plant per spot after germination​.

How to Grow

Make sure that the plants get at least 8 hours of sun daily. Water deeply but infrequently, letting the soil dry between waterings to encourage strong root development. Mammoth sunflowers are heavy feeders, so mix compost or a slow-release fertilizer into the soil at planting time. Taller plants may need staking, especially in windy areas​.

How to Save

  • When petals die back and heads begin to dry and turn brown, place a paper bag over the heads to protect seeds from birds.
  • After a few days, the heads will dry to a dark brown. Bring the heads indoors and hang them upside down in a dry area in direct sunlight for up to a week, shaking seeds free each day.
  • Store in a cool, dark, dry place.

FAQ

Do Mammoth Grey Striped sunflowers need support?
Yes, due to their height and heavy heads, staking may be necessary in windy areas.

How often should I water Mammoth Grey Striped sunflowers?
Water deeply but let the soil dry between waterings. Once established, they are drought-tolerant​.

Can I grow Mammoth Grey Striped in poor soil?
While sunflowers can tolerate various soils, they grow best in rich, fertile soil with good drainage​.

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Sunflower Seeds, Mammoth Grey Striped
star-filled
4.3
Customer reviews (31)

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