Free Shipping on Orders Over $79

Search our store

Sunflower Seeds - Mammoth Grey-Stripe Helianthus annuus

Buy Sunflower Seeds by the Packet or in Bulk

Unit Size Unit Price Savings Qty
Packet $3.95
1 Ounce $7.95
1/4 Pound $16.95 47%
1 Pound $39.95 69%
5 Pounds $149.95
($29.99/lb.)
76%
Add to Wishlist
  • Annual; A crowd favorite!
  • Delicious seeds
  • Prefers full sun exposure

Product Description

Heirloom Mammoth Grey-Stripe Sunflower Seeds -Helianthus annuus

The most familiar and iconic of all the classic sunflowers, our Mammoth Grey Stripe Sunflower seeds may look like the kind you can eat, but we think you'll find them much more rewarding when planted in a sunny location. These beautiful flowers live up to their name and can grow up to a towering 12 feet high with 10+ inch blooms!!

  • Fast Facts

    Name:Sunflower Seeds - Mammoth Grey-Stripe
    Botanical Name:Helianthus annuus
    Life Cycle:Annual
    Light Requirement:Full Sun
    Planting Season:Spring
    Plant Type:Tall green stalks with large yellow blossoms and dark center.
    Features:Open Pollinated, Cut Flower Garden, Easy to Grow & Maintain, Edible, Attracts Pollinators, Deer Resistant, Drought Tolerant
    Color:Yellow
    Blooms:Summer, Late Summer, Early Fall, Fall
    Plant Height:Up to 144 inches
    Plant Spacing:12-18 inches
    Planting Depth:1/2 inch
    Sowing Method:Direct Sow
    Cold Stratification:No
    Seeds per Packet:3 g
    Hardiness Zones:1, 2, 3, 4, 5, 6, 7, 8, 9, 10
    Ships:Year Round
  • Planting Instructions

    How to Plant Mammoth Grey Stripe Sunflowers

    When to Plant Sunflower Seeds

    It is recommended to sow your sunflower seeds directly into your garden rather than start them in starter pots. Sunflowers send down long taproots that can be stunted in small pots. Once all danger of frost has passed and both daytime and nighttime temperatures reach 55F to 60F you are ready to sow your sunflower seeds.

    Where to Plant Sunflower Seeds

    Sunflowers grow best in full-sun locations – receiving at least 6 to 8 hours of full sun exposure per day. Though sunflowers are not finicky, they do appreciate loose, well-draining soil. Choose a location that is sheltered from strong winds, perhaps along a fence or near a building. Also consider the height that the particular variety will reach.

    How to Plant Sunflower Seeds

    Once you have chosen your location, dig down to a depth of 2 inches and turn the soil over to loosen it. Many seeds, like poppies, need sun to germinate. This is not the case with sunflowers and in fact need to be pressed 1 inch deep into the soil. If left on the soil surface, more than likely birds will come and eat them before they ever get anywhere close to germination. Final spacing should be 36” apart for giant sunflowers, 24’ apart for regular-sized and 12” apart for miniature varieties.

    How to Care for Sunflowers

    Sunflowers are usually problem-free. Plant early enough so that autumn frosts do not cut your sunflowers’ life cycle short. Too much rainfall before and after germination can cause the seeds to rot or bring on downy mildew. Be sure to seed after the rainy season to avoid this.

    If you would like to harvest the seeds to either replant next year, wait until the end of the bloom cycle. Sunflowers blooms often last 30-45 days. Toward the end of this period, the green back of the flower head will begin to turn yellow and will usually droop at this time. You will also see the seeds swelling on the face of the sunflower. Cover the flowers with paper bags to protect them from birds. Cut off the flower heads and leave inside the brown paper bag. Store this bag in a well-ventilated place like a garage until fully dry. Rub along the seeds with the palm of your hand and the seeds should fall right out into your bag, or work over a cookie sheet. Store seeds in a cool, dry environment until you are ready to reseed next year.

    To eat: Soak overnight in water, or salt water. Drain, spread on a shallow baking sheet, and roast for 3 hours at 200F or until crisp.

    Download Printable Planting Guide

  • Planting Video

  • Seed Coverage

    Amount Recommended Coverage
       
    Packet Up to 10 Sq. Ft
    Ounce Package Up to 30 Sq. Ft
    1/4 Pound Package Up to 125 Sq. Ft
    1 Pound Sack Up to 500 Sq. Ft
    5 Pound Sack Up to 2,500 Sq. Ft

Product Reviews

5.00
Global Rating: 5.00 from 4 reviews
5.0

Review By

Mammoth is right!

Our sunflower was 12 feet tall. It was a huge tree! Beautiful! I’d post a pic if I could!

5.0

Review By

MAMMOTH GREY STRIPE ARE AWESOME!

I had never planted sunflowers before June 2017. They averaged a foot of growth per WEEK finally reaching a height of 6 feet ABOVE my 6-foot white fence! Strangers stopped by to take photos. The heads measured up to 18 inches across! After losing one stalk on a windy day we tied the rest to our fence with twine. This year I couldn't find Mammoth Grey so tried another kind. It's so slow growing I've decided to order Mammoth Grey and start over, even though it's mid-June. These were beyond my wildest dreams!

5.0

Review By

Very pleased!

we ordered a one ob package of sunflower seeds for wedding favor packets and were very pleased!!

5.0

Review By

Mammoth GreyStripe Seeds

I'm very pleased with my recent purchase of Mammoth Greystripe Sunflower Seeds. Customer service was great when I had to make a change on my order and the seeds arrived in a timely manner. The seeds themselves look beautiful and healthy and I'm very excited about getting them in the ground soon.

Add your review of this product
X

Create new wish list

Go to top
SAVE TODAY! 10% OFF YOUR NEXT ORDER GREAT DEALS DELIVERED DAILY

Join our V.I.P. list! You'll save 10% on today's order and receive special offers, gardening tips and helpful resources daily. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

* required field