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Guaranteed to Grow
Neonicotinoid-Free
Heirloom

Mammoth Grey Stripe Sunflower

Quick Facts:

  • Yellow flowers reach 12" in diameter
  • Colossal 10-12' stocks
  • Produces hundreds of striped, grey seeds
  • Loved by birds; Makes great chicken feed
  • Blooms summer to fall

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Quantity: Packet (50 Seeds)

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We ship to all areas of North America including the United States, its territories and outlying islands, and Canada. International orders may incur an additional charge to cover the handling of customs paperwork. Returns are accepted within 30 days of receipt. Full warranty information can be found here.

Mammoth Grey Stripe Sunflower

More about Mammoth Grey Stripe

Helianthus annuus

Truly a mammoth!  Mammoth Grey Stripe sunflower produces colossal ten to twelve-foot-tall stalks topped by gigantic heads reaching up to 12 inches in diameter.   Sturdy stems are inviting of a climb, but be warned, they're a bit prickly.  Large seed heads eventually bring forth hundreds of grey-striped seeds, the weight of which flips the head upside down.  At this point birds start to take notice, which is a bad thing if you intended to eat those seeds, but you'll get at least a bit of consolation watching the birds perform acrobatic feats trying to get at your ripening seeds. And once that wears off you can always cover the heads with fine mesh or breathable row cloth to keep the birds away.  Mature... More

Less

Helianthus annuus

Truly a mammoth!  Mammoth Grey Stripe sunflower produces colossal ten to twelve-foot-tall stalks topped by gigantic heads reaching up to 12 inches in diameter.   Sturdy stems are inviting of a climb, but be warned, they're a bit prickly.  Large seed heads eventually bring forth hundreds of grey-striped seeds, the weight of which flips the head upside down.  At this point birds start to take notice, which is a bad thing if you intended to eat those seeds, but you'll get at least a bit of consolation watching the birds perform acrobatic feats trying to get at your ripening seeds. And once that wears off you can always cover the heads with fine mesh or breathable row cloth to keep the birds away.  Matures approximately 100 days after sowing.  Each packet contains a minimum of 50 seeds.

Helianthus annuus

Truly a mammoth!  Mammoth Grey Stripe sunflower produces colossal ten to twelve-foot-tall stalks topped by gigantic heads reaching up to 12 inches in diameter.   Sturdy stems are inviting of a climb, but be warned, they're a bit prickly.  Large seed heads eventually bring forth hundreds of grey-striped seeds, the weight of which flips the head upside down.  At this point birds start to take notice, which is a bad thing if you intended to eat those seeds, b... read more

read less

Helianthus annuus

Truly a mammoth!  Mammoth Grey Stripe sunflower produces colossal ten to twelve-foot-tall stalks topped by gigantic heads reaching up to 12 inches in diameter.   Sturdy stems are inviting of a climb, but be warned, they're a bit prickly.  Large seed heads eventually bring forth hundreds of grey-striped seeds, the weight of which flips the head upside down.  At this point birds start to take notice, which is a bad thing if you intended to eat those seeds, but you'll get at least a bit of consolation watching the birds perform acrobatic feats trying to get at your ripening seeds. And once that wears off you can always cover the heads with fine mesh or breathable row cloth to keep the birds away.  Matures approximately 100 days after sowing.  Each packet contains a minimum of 50 seeds.

Little Girl planting seeds
Little girl planting seeds

How to Grow Sunflowers

Sunflowers are widely adapted to a variety of climates and are especially tolerant of cold temperatures.  Sunflowers will flourish in a wide variety of soil types, from clay to sandy, so long as sufficient nitrogen is available throughout the growing season.  The water requirements of sunflowers are similar to those of other field crops.  Plants should be irrigated if drought occurs within 20 days of pollination as this period is especially critical for seed development.

After danger of frost has passed, sow seeds 6" apart, 1/2" deep in rows 36" apart.  Germination will occur in 6-10 days.  Thin to one plant every 24" once seedlings have reached six inches tall. Can also be started indoors 4 weeks before the average last frost date.

Transplant outdoors after danger of frost has passed.  Plants should be spaced 18-24" apart to provide for ample air flow.

Sunflowers are susceptible to a number of common diseases including verticillium wilt, mildew, leaf spot, and rust.  However, the extent of these diseases is usually not of consequence to the home gardener.  Ensuring adequate airflow by thinning plants to the recommended spacing will reduce the incidence of disease and cultural practices such as crop rotation, tillage and removal of plant debris in the fall will limit its spread.

Sunflowers make great cut flowers. They are long-lasting and have a bright, cheerful appearance that adds a cheerful touch to any bouquet or arrangement. Sunflowers are also easy to care for, and can last up to a week when cut and placed in a vase with fresh water. When harvesting fresh cut flowers, cut the main head just before it blooms to encourage additional blooms on side shoots. Harvesting flowers in the morning will prevent premature wilting.

CONSIDERATIONS:

Sunflowers are outbreeding plants, relying on bees and other insects for their pollination. Varieties may be self-compatible or self-incompatible, meaning that pollen must be moved from one plant to another. Plants of different varieties must be isolated by 1/2 to 3 miles, depending on the population size and insects in the area, to maintain varietal purity. Hand pollination can be performed by bagging heads and rubbing the flowers of adjacent plants together each day for 10 consecutive days. Heads should be re-bagged after pollination to prevent pollen contamination and predation by birds.

HARVESTING SEED:

SEED LONGETIVITY:

Sunflower seeds can remain viable for up to five years if stored in a cool, dry place.

Arikara Sunflower

Customer Reviews

Based on 5 reviews
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L
L.D.
Germinates fast!

Came in great packaging and germinated fast. Still waiting for them to get big as were just planted

L
Laurie Childs
So Far, Great!

These Mammoth sunflower seeds have sprouted indoors, and are about 2 weeks along. The plants are approximately 9" tall and should be ready to transplant in another week or so. I can hardly wait! This is one of my very favorite varieties of sunflowers. Two thumbs up!

C
Chase Smith
Thriving

Almost all the seeds have sprouted and are thriving in this California sun, thank you!

A
Adrian E
Highly recommend

Great seeds

D
Deb Weir
Growing well

I haven't yet planted all of the seeds, but the ones I have planted are growing well. Hopefully they continue to do well and grow into big beautiful sunflowers!

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