Various Sizes
"All the seeds sprouted but they all grew different sizes. A few were tall with the largest heads about 6 inches across."
Sunflower Mammoth Seed
SKU: 00747RAWUTR-50SD
$3.16
$3.95
You save 20%
Sunflower Mammoth Seed
SKU: 00747RAWUTR-50SD
$3.16
$3.95
You save 20%
$3.16
$3.95
You save 20%
Save 20% on RAW / UNTREATED / 50 seeds
Save 20% on RAW / UNTREATED / 250 seeds
Save 20% on RAW / UNTREATED / 1,000 seeds
These plants are 8' and more in height when well grown and make an effective screen or background. The impressive flower heads have brown centers surrounded by yellow petals and are often 12" across. When dry, the seed heads can be cut and sold as is for wild bird food. Or spread them out under cover until seeds loosen and shatter out of the head, then package them as snack food and for baking.
Color: Brown centers surrounded by yellow petals
To harvest your Mammoth Sunflower seeds for sale or eating, cut the head off after the stalk dries but before fall or winter rain arrives. The flower is ready for harvest when the florets in the center wilt and the back of the flower head is turning yellow or starting to droop. Mammoth sunflower seeds do best when directly sown in a full-sun location with warm, well-drained soil after frost potential is past. Provide a trellis, heavy cord or fence for young vines to climb and develop their strong stalks. Once established, these annuals offer fair drought tolerance. Huge flowers turn the heads of passersby and appeal to butterflies and other pollinators.
Color: Brown centers surrounded by yellow petals
Growing Tips
To ensure your Mammoth Sunflower seeds grow to be tall plants, remove weeds with the help of a natural mulch. Using mulch also helps retain soil moisture and heat. Use shredded leaves as an organic mulch for your Giant Mammoth Sunflower seeds to improve soil quality. Always keep mulch away from the flowers' stems to prevent possible deterioration.To harvest your Mammoth Sunflower seeds for sale or eating, cut the head off after the stalk dries but before fall or winter rain arrives. The flower is ready for harvest when the florets in the center wilt and the back of the flower head is turning yellow or starting to droop. Mammoth sunflower seeds do best when directly sown in a full-sun location with warm, well-drained soil after frost potential is past. Provide a trellis, heavy cord or fence for young vines to climb and develop their strong stalks. Once established, these annuals offer fair drought tolerance. Huge flowers turn the heads of passersby and appeal to butterflies and other pollinators.
Buy tall sunflower seeds online today for an eye-catching summer display of height and color!
Buy more, save more! All eligible quantity discounts will be automatically applied in your Cart.
| Size | Quantity | Price Each |
|---|---|---|
| RAW / UNTREATED / 10,000 seeds | 2+ | $47.78 |
Shipping
Enjoy free standard shipping on orders over $300. For orders under $300, shipping and handling are calculated based on your pre-tax order total. Freight surcharges may apply for oversized, heavy, or special-handling items.
Most orders are currently shipping within 5–7 business days via USPS or UPS (excluding backorders), though shipping times may vary during our peak season from January - May.
We also recommend selecting a future ship date that aligns with your planting schedule. Please note that we do not ship on weekends or company-recognized holidays
To help reduce the number of partial shipments, after the first shipment, we may hold an order until the majority of remaining items are available to ship together.
- Soil Temperature: 70-75°F
- Germination Lighting: Cover Seed
- Germination Days: 4-8 Days
- Grow on Temperature Day: 55-60°F
- Plant Spread: 30-36"
- Plant Height: 8-10"
- Plant Type: Annual
- Seeding Depth: 0.75-1.0"
- Maturation Days: 75 Days
- Planting Method: Direct Sow
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Overall rating: 4.8 / 5 from 25 reviews.
AI Generated Review Summary
Summary topics
Review topics: ["size","results","plants","heads","flowers","seeds","garden"].
Review highlights
Reviews
great
"great"
Wonderful sunflowers
"I love them they are huge. Was worried they weren’t going to make it one head just broke right off not sure way but the rest are doing great. Gonna try saving some seeds from them."
It was me!
"I wasn’t very successful this year but it was all me!! Timing and weather played a big part! But I will try again next year with the same product!!! I have had some wonderful success in the past!!! Thanks for checking in on me."
Great service
"Plants are growing great but too soon to know the results as of yet."
Seeds Delivery
"Too soon to know what will come up. The cost of the product was OK but I will not purchase Harris products because of the delivery charge."
Huge Beautiful Garden
"We have planted these fast growers two years straight. We live in a small midwest town and own a business, we use the field for families to take photos. They are PERFECT! We even made the front cover of the paper!"
Excellent sunflower value
"100% germination, great size, lovely flower, definitely lives up to expectations. Held up to weather and wind, planted in a block. Seed was easy to harvest. Will definitely plant again!"
Absolutely beautiful
"Near 100% germination and huge plants. They turned out beautifully. I'm very impressed by these. You have to keep the deer away or you won't get any."
Great
"Great"