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Sunflower, Mammoth Organic

Short Description

Enormous organic sunflower.

Full Description

An amazing giant heirloom sunflower with enormous blooms, up to 1 ft. across. The large yellow flowers with brown centers top plants 9-12 ft. tall and yield heavy loads of seeds. Fast and easy to grow, Mammoth sunflowers are great for creating a sunforest for kids, a tall annual hedge or screen. Sow in the spring after the last average frost date. When around 3" tall, seedlings should be thinned to 2 ft. apart. Edible seeds attract birds and make great snacks. To save seeds, cut the stem beneath flower heads when the backs of the flower heads turn yellow. Hang upside down and let dry in a cool, dry place for about a month. Cover with netting or a paper sack with holes to keep seeds from falling. But watch out for squirrels! Certified Organic Seed.
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Quantity
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Item#: 60740A
Order: 1 Pkt. (100 seeds)
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$4.95
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Product properties

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.

Annual

Sow Method This refers to whether the seed should be sown early indoors and the seedlings transplanted outside later, or if the seed should be sown directly in the garden at the recommended planting time.

Direct Sow

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Video

Introduction to Annual Flowers
Annual flowers are easy and rewarding to grow. We’ll show you the basic ideas to get you started.
Watch video
Growing Sunflowers
See how easy it is to grow these summertime favorites.
Watch video

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 feet 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.
Sun
Full Sun
Height
108-144 inches
Spread
36-40 inches
Ornamental Use
Beds, Borders, Cut Flowers
Life Cycle
Annual
Sow Method
Direct Sow
Flowering
true
Bloom Duration
5
Sunflower, Mammoth Organic is rated 4.75 out of 5 by 4.
Rated 4 out of 5 by from Huge heads and Height! This sunflower was great, growing tall to more than 12 feet high with huge sunflower heads that attracted bumble bees. After they dried up, huge seeds were left in the head, and plenty of them. The only bad thing is the wind will snap them, and they kinda hang over because the weight of the head, so support them. Other than that, I highly recommend this plant for Zone 5 gardeners
Date published: 2014-02-15
Rated 5 out of 5 by from I planted 6 of these sunflowers, but slugs ate th4em before i had a chance to sluggo down. i will plant these again next year!
Date published: 2013-08-12
Rated 5 out of 5 by from Highly Recommend Purchased the Mammoth Sunflower seeds back in April and so far I am very pleased with them. Every seed planted came up and several are near ready to bloom! They look healthy and are definitely worth getting because they add great color and height to any garden!!
Date published: 2013-06-05
Rated 5 out of 5 by from first time grower.......... Awesome huge strong plants...a winner!
Date published: 2011-09-27
  • 2016-05-31T06:41CST
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