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Sunflower, Mammoth Russian

Short Description

Huge heads are ideal for competition at fairs.

Full Description

This is the giant one with huge heads that are ideal for competition at fairs. Thin-shelled, striped seeds are plump, meaty and very plentiful. Proven tops for performance and adaptability. Easy to grow and attracts butterflies.
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Order: 1 Pkt. (200 seeds)
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Product properties

Type Some flowers and vegetables fall into subcategories that may define how they grow (such as pole or bush), what they are used for (such as slicing tomatoes or shelling peas), flower type, or other designations that will help you select the type of a class of plant that you are looking for.


Sun The amount of sunlight this product needs daily in order to perform well in the garden. Full sun means 6 hours of direct sun per day; partial sun means 2-4 hours of direct sun per day; shade means little or no direct sun.

Full Sun

Height The typical height of this product at maturity.

108-144 inches

Spread The width of the plant at maturity.

36-40 inches

Ornamental Use Ways in which the product may be used in the garden for ornamental effect.

Beds, Borders, Cut Flowers

Life Cycle This refers to whether a plant is an annual, biennial or perennial. Annuals complete their life cycles in one year; biennials produce foliage the first year and bloom and go to seed the second year; perennials can live for more than two years.


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Growing Sunflowers
Growing Sunflowers
See how easy it is to grow these summertime favorites.
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  • Sunflowers

    Start Indoors Start Indoors Starting seeds indoors is called Indoor Sow or Indirect Sow and these dates are when to sow seeds indoors in the spring or summer
    Transplant Transplant When to transplant bulbs or roots in the garden for spring
    Start Outdoors Start Outdoors Starting seeds outdoors is called Outdoor Sow or Direct Sow and these dates are when to sow seeds outdoors in the spring or summer
    Start Indoors Fall Start Indoors Fall Starting seeds indoors in the fall called Indoor Sow or Indirect Sow and these dates are when to sow seeds outdoors in the fall
    Transplant Fall Transplant Fall Transplant Fall-When to transplant bulbs or roots in the garden for fall
    Start Outdoors Fall Start Outdoors Fall Starting seeds outdoors in the fall is called Outdoor Sow or Direct Sow and these dates are when to sow seeds outdoors in the fall
    S S Succession Planting This means that the plants have multiple harvests in a season
    First Date: May-09 - Last Date: Jun-23

Sunflowers are grown from seed sown directly in the garden after frost.

  • Direct sow seeds in average soil in full sun after all danger of frost.
  • When choosing a site consider that sunflowers need a well-drained soil.  They face the sun, so make sure they are in an open area of the garden. The taller varieties will cast shadows on other plants, so plant these at the north end of your garden.
  • Prepare the soil by removing weeds and working organic matter into the top 6-8 inches of soil; then level and smooth.
  • Most plants respond well to soils amended with organic matter. Compost is a wonderful form of organic matter with a good balance of nutrients and an ideal pH level, it can be added to your planting area at any time. If compost is not available, top dress the soil after planting with 1-2 inches of organic mulch, which will begin to breakdown into compost. After the growing season, a soil test will indicate what soil amendments are needed for the following season.
  • Sow seeds ½ inch deep in groups of 2 or 3 seeds. Space the groups 18-24 inches apart, depending on the variety.
  • Firm soil lightly, water and keep evenly moist.
  • Seedlings will emerge in 7-10 days.
  • Thin to one plant per group when seedlings have two sets of leaves.
  • Keep weeds under control during the growing season. Weeds compete with plants for water, space and nutrients, so control them by either cultivating often or use a mulch to prevent their seeds from germinating. 
  • Mulches also help retain soil moisture and maintain even soil temperatures. For annuals an organic mulch of shredded leaves lends a natural look to the bed and will improve the soil as it breaks down in time. Always keep mulches off a plant’s stems to prevent possible rot.
  • Keep soil evenly moist but not wet.
  • Once established sunflowers can tolerate drought.
  • No fertilizer is needed unless the soil is poor. Do not over fertilize.
  • Monitor for pests and diseases. Check with your local Cooperative Extension Service for pest controls recommended for your area.
  • Some varieties only produce one bloom so once the bloom is spent, the plant may be removed.
  • Remove plants after they are killed by frost in fall to avoid disease issues the following year.
  • Edible sunflowers will mature in about 3 months or more after sowing. To harvest the seeds, cut the heads off after the stalks are quite dry but before fall or winter rains come. Check the flower heads for maturity to see if the florets in the center of the flower disk have shriveled and the back of the flower head is turning yellow, or the head is starting to droop. Cut flower-heads with a foot of the stalk attached. Hang heads in a warm, dry, well-ventilated place so the seeds may fully ripen and dry. Cheesecloth, netting or a paper bag with holes punched in for ventilation should be placed over the head to protect the seeds and to collect those that may drop from drying.
  • Shorter varieties may be grown in containers. Be sure to use a commercial potting mix.
  • Pollenless varieties make terrific cut flowers.
Full Sun
108-144 inches
36-40 inches
Ornamental Use
Beds, Borders, Cut Flowers
Life Cycle
Growth Habit
Sow Method
Direct Sow
Bloom Duration
5 weeks
Flower color
Sunflower, Mammoth Russian is rated 4.3 out of 5 by 24.
Rated 1 out of 5 by from Mammoth or mini? The attached photo was taken at the time of this review posting. This is my second sowing of these seeds, purchased as "mammoth". Out of the package, the seeds are extremely small, and would barely be large enough to eat if the plants produced seeds that size. The first planting attempt produced stalks half as big, never produced, and died. It was hot in Florida, then, hence the replanting. It's cooler now, but these plants are barely 1 ft tall. They're cute, but not what I wanted. I was looking forward to offering seeds to the birds, but these won't do. The envelope does say "mammoth", but I'm wondering if there was a mix-up in packaging?
Date published: 2019-10-25
Rated 1 out of 5 by from Not Mammouth Don't waste your time of money - I planted 650 in May 2019, they all came up and sufficient water thru the summer - thinned the spacing as recommended. 3 or 4 may have reached the top of my head the rest only waist high the flowers 6 to .maybe 8 inches in diameter. Total waste. I planted half organic and the other half Russian mammoth in two separate beds. Don't buy
Date published: 2019-08-22
Rated 5 out of 5 by from Flawless Bought these late in the season and planted them immediately after. Mostly just a trial run because i had an empty flowerbed. Just wanted to see how they did, take notes, and be ready for the following year. There were NO notes to take. All 10 plants grew in standard ground fertilizer or special care. Watering twice a day--our temps are hitting 106/110 now. They didnt get as tall as i had expected but all of them cleared 7ft. Just fine. Harvested plant #1 last week (the rest need more time) picked up a quick roasting recipe online and did THAT this morning. 40 minutes later and I have got the BEST tasting sunflower seeds EVER. I have something like 190 seeds left from my initial purchase so i wont be harvesting plants for re-seeding, just EATING! Pictures below are of the smallest head.
Date published: 2018-08-04
Rated 5 out of 5 by from How long for blooms? Does anyone know appoximately how many day it takes for these beauties to flower.
Date published: 2018-07-11
Rated 4 out of 5 by from these are interesting plants Most seeds sprouted; were started in seed trays or peat pots. Can almost watch them grow they are getting so large so fast.
Date published: 2017-07-20
Rated 5 out of 5 by from great results. I had a 100 % germination of the Russian Giant Sunflower seeds. I planted late April and they are now over 9 feet tall and beginning to make heads. Stunning growers.
Date published: 2017-07-15
Rated 1 out of 5 by from Fail Not sure what we were sent, but these are definitely not 'mammoth'
Date published: 2017-06-07
Rated 5 out of 5 by from Easy to grow, beautiful to look at, tasty to eat! Planted in May 2016. Grew like Jack and the Bean Stalk! Truly mammoth! At times, I mistook them for trees. They even provided shade like trees. Flowers were huge, bigger than my head! Blooming was a big event. Absolutely breathtaking. My neighbors in the community garden were super impressed. The bees were my biggest admirers. The birds, my biggest snackers. The seed harvest was huge and delicious. It's February, and I'm still snacking on the seeds. TIPS: If you're going to harvest the seeds, make sure to tie each plant to a sturdy stake. When the seeds set, the plant droops and may fall over if not supported. Also, when birds and other critters start snacking on your plant, that's your sign that the seeds are ready to be harvested.
Date published: 2017-02-15
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