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Cosmos, Sensation Mix

Short Description

Large plants make a bold, beautiful statement in your flower garden.

Full Description

Large, single flowers with yellow center bloom from midsummer on. Easy to grow. Graceful for backgrounds, borders and bouquets, with seed heads that attract birds. Tolerates poor soil and hot, humid conditions. GARDEN HINTS: For earlier bloom, plant seeds indoors about 6-8 weeks before outdoor planting time. Cultivate or mulch to control weeds.
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Order: 1 Pkt. (500 seeds)
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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.

36-48 inches

Spread The width of the plant at maturity.

12-14 inches

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

Borders, Container, 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.


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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  • Cosmos

    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
    First Date: Mar-21 - Last Date: Apr-04
    First Date: May-09 - Last Date: May-16

Cosmos seed should be sown directly in the garden after frost.

  • Direct sow seeds in average soil in full sun after danger of heavy frost.
  • Select a location in full sun to part shade with good rich well-drained organic soil protected from wind.
  • Prepare the bed by turning the soil under to a depth of 8 inches. Level with a rake to remove clumps of grass and stones.
  • 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 4 inches apart and ¼ inch deep
  • Firm soil lightly, water and keep evenly moist.
  • Seedlings will emerge in 7-10 days.
  • Thin plants to stand 8-10 inches when seedlings are 1 inch high.
  • 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.
  • After plants are about 6 inches tall, a light fertilizer may be applied. Keep granular fertilizers away from the plant crown and foliage to avoid burn injury. Use low rates of a slow release fertilizer, as higher rates may encourage root rots.
  • Tall cultivars may need staking to prevent their thick, hollow stems from breaking due to heavy rain or wind.
  • Pinch off spent flowers to encourage continuous bloom. Pinching stem tips can reduce height and encourage branching but isn’t necessary. Deadheading is recommended since it lengthens the bloom season. Cosmos plants that aren’t deadheaded will self-sow in warm regions.
  • Monitor for pests and diseases. Check with your local Cooperative Extension Service for pest controls recommended for your area.
  • Remove plants after they are killed by heavy frost in fall to avoid disease issues the following year.
  • Cosmos plants can withstand heat and drought conditions.
  • Tall cosmos add a soft, airy touch to the back of an annual or mixed border. You can also use them as a fast-growing annual hedge or in a cutting garden. Since the taller cultivars are not always uniform in height, they’re perfect for adding an informal look to cottage gardens. Shorter cultivars of both species are ideal near the front of the border, in containers, or as edgings.
  • Cosmos makes beautiful cut flowers.
  • Because cosmos is easy to grow and the seeds are large and easy to handle, it is a good choice for a children’s garden.
Full Sun
36-48 inches
12-14 inches
Ornamental Use
Borders, Container, Cut Flowers
Life Cycle
Sow Method
Direct Sow
Bloom Duration
10 weeks
Flower color
Pink, Red, White
Cosmos, Sensation Mix is rated 4.3 out of 5 by 14.
Rated 2 out of 5 by from Disappointing I live in northwestern Minnesota so the seeds were started indoors and transplanted outside the firstvweek in June. They are thriving but are totally white. The package says”mixed”. I planted a dozen plants thinking that would be enough. Another reviewer said theirs were predominantly mauve. I’d like to know why they cannot have a true mix. It’s too late now to plant anymore and I amd extremely disappointed.
Date published: 2018-07-10
Rated 5 out of 5 by from Late blooming but beautiful I'm writing a review to warn people that these cosmos may keep you waiting a long time for blooms. I planted mine in late May, and they bloomed in mid October! Before then they were gorgeous vigorous plants with lots of fronded branches which still complemented my Rubenza cosmos which bloomed very early but whose leaves were spindly and sad. I wish I had known that the Sensation Mix cosmos would bloom so late: I cut down half my plants in despair in September and missed out on a spectacle of blooms. The remaining plants are still bursting with flowers and buds at the end of October.
Date published: 2017-10-29
Rated 5 out of 5 by from Great seeds and service! I bought fours packets of Cosmos seeds and they are growing beautifully. But, I was even more impressed with Burpee customer service when I had a hiccup with my order. That will keep me coming back -- thank you!
Date published: 2016-09-15
Rated 3 out of 5 by from Waiting patiently I was late in getting them planted, 5/16/16. They were planted in rather heavy soil, but I tried to condition with a lighter mix. They are in full sun and are growing well at 3 1/2 ft and the green foliage looks great, but so far 8/28/16 no blooms. Getting concerned. The package reads 65 days, but do not see a time to bloom on this info page.
Date published: 2016-08-29
Rated 5 out of 5 by from Lovely Cosmos! Beautiful, carefree flowers! This was my first time growing cosmos and it won't be the last. I direct sowed them on March 30, and the blooms started appearing as soon as June 1. Keep in mind that each individual plant will produce flowers of the same shade of pink, so if you want a wider variety of color, plant several cosmos together to get an array of blooms.
Date published: 2015-08-30
Rated 5 out of 5 by from Beautiful Cosmos Cosmos are one of the easiest seeds to grow. They are delicate looking with their fern foliage, but do not be deceived as they are very hardy! They make great cut flowers that last. You must have these hassle free flowers in your garden.
Date published: 2014-09-21
Rated 4 out of 5 by from Colorful cosmos! Great type, but I planted it in more of a clay type soil, and could of watered it more during the summer. It only reached less than a foot tall, but the blooms were very colorful and after they dried up they seeded. I'll have to see in the Spring iff they come back up!
Date published: 2014-02-15
Rated 3 out of 5 by from Cosmos, Sensation Mix The germination rate was about 50%, under the same conditions as that for the Zinnia Cut-and-Come Again and the Mammoth Russian Sunflower, both of whch were about 95%. Once out, the seedling are doing OK, I plan to transfer all three to flowerbeds in a week. I have been doing this for years, and must say the cosmos seeds played hard to get this time. I can send you photos of the flowers, they are always spectacular. The birds and squirrels love the sunflower seeds, and the neightbors always compliment us on the colorful combination of cosmos and zinnias. On anotther subject, why use what looks like 3-point fonts in this window? You have lots of wasted white space. Regards, Igor
Date published: 2012-05-09
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