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Sunflower, Kong Hybrid

Short Description

Fast-growing giant.

Full Description

The most stunning of our giant sunflowers, with sturdy stems and lush leaves. It forms a massive wall of foliage topped off with extra large, perfectly round 10" golden flowers. Rapid growth from seed to maturity by mid-summer.
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Item # Product
Item#: 36025A
Order: 1 Pkt. (25 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.

168 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.

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
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
    First Date: May-09 - Last Date: May-16

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.
Full Sun
168 inches
36-40 inches
Ornamental Use
Borders, Cut Flowers
Life Cycle
Growth Habit
Sow Method
Direct Sow
Bloom Duration
6 weeks
Flower color
Gold, Yellow
Sunflower, Kong Hybrid is rated 4.4 out of 5 by 19.
Rated 5 out of 5 by from Huge plants! This was the first year I planted sunflowers, so I didn't know what to expect. The plants got so tall that my neighbors were afraid to walk past my house, fearing the sunflowers were going to swallow them up! Anyway, I assured them that the sunflowers were harmless and that they had nothing to fear. The flowers provided tons of nectar and pollen for the bees. Then the Goldfinches showed-up to eat the seeds. It was just a sunflower festival the entire summer through!
Date published: 2016-09-17
Rated 5 out of 5 by from Kong I love this flower and have had great luck with it in the past . This year for some reason my Kong s came up American Giants and they are not as pretty .
Date published: 2015-06-13
Rated 5 out of 5 by from Grew just as big as "KING KONG" himself! I first planted these sunflowers along with the Russian mammoth and spikes in my garden during the first week of May in 2014. I planted 3 packets (75 seeds) and these sunflowers fully bloomed to over 14ft by July 28th!! I had 48 massive Kong Hybrid sunflowers in my garden. they bloomed extremely quickly and they were massive. The sunflowers also had little blossoms sunflowers also growing and sticking out all of the stems! When we had that tropical storm with winds 50mph+, I went to bed that night and heard tree branches snapping, garbage cans rolling all over the place and it was nasty weather. So I said to myself that my garden will be destroyed and it was a good garden season and was focusing onto next year. However, I went out the next morning and out of the 48 Kong sunflowers I had in my garden, only one was slightly damaged from the high winds!!!! I didn't even stake them! I was in shock when I saw that. The trunks on these sunflowers are big and strong as tree trunks! My sunflowers made my town's local weekly newspaper which many people stopped in front of my house and asked me about my garden!
Date published: 2015-03-22
Rated 4 out of 5 by from Huge! These sunflowers grew to about 10-12 feet in my garden and the trunks/stems are about 3" in diameter. I mixed them in with my sweet corn, which I think probably wasn't a real great idea because it appears to have affected the pollination of my corn. The tallest plants don't seem to be able to hold up the weight of the flower and they're stooped over. This may be because we've had so much rain here lately that they haven't had enough sun. We had a pretty wicked wind storm a few weeks ago and they stood through it like champs. They really are a pretty flower and the bees love them. The only knock I have against them is the bending over that some of them are doing but that's probably due to the growing conditions we've had here since they started to bloom. I also haven't seen any of the secondary blooms some of the other folks have mentioned but I'm in northern Minnesota so it could be we just have too short of a growing season for that here.
Date published: 2014-08-24
Rated 5 out of 5 by from Tall, very tall sunflower! 12' and still growing! Pacific NW having a sunny summer for once and this flower is growing as advertised!
Date published: 2013-07-26
Rated 5 out of 5 by from Great Sunflower! I only have one bloom at the present, however, I have numerous flowers in bud that are fixing to bloom. The plant is great and I have enjoyed it!
Date published: 2012-05-09
Rated 5 out of 5 by from Great sunflower This is the second year we're growing the Kong Hybred and couldn't be happier. One of the things we like about these 12-14 ft monsters is that they also have 15-20 smaller sunflowers growing up and down their canes. They can also handle 30-40 mph wind gusts without an issue.
Date published: 2012-05-08
Rated 5 out of 5 by from Sunflower Jungle! Holy crow! This is THE TALLEST FLOWER I have ever grown!! One of them clocked in at 17 feet! There are 2 things to remember though, 1. Give it TONS of sunlight! Full Sun is absolutely necessary. 2. Give it a lot of water. The germination isn't great, so I suggest starting it indoors in Aprilish- depending on where you live.
Date published: 2011-03-30
Date published: 2009-08-07
Rated 5 out of 5 by from Kong Hybrid Sunflowers These are great sunflowers. I grow sunflowers every year and last year i tried the Kong Hybrid. I was quite impressed how they survived hurricane force winds here in Florida. They grew to about 15ft tall and the center of the flower was probably as wide as a dinner plate. My neighbors loved seeing them on thier walks arround the neigborhood. Very easy to grow as long as they get full sun they will make you very happy! :)
Date published: 2009-03-21
Rated 3 out of 5 by from fourteen feet? The flowers are easy to grow and nice looking. However, the first plant bloomed at about 6 and a half feet. If it's going to grow another 7 and half feet, then the claim of a fourteen foot flower is legit. Otherwise, it's not. i'm not impressed with claims that are not true.
Date published: 2008-06-14
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