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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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Item#: 40832A
Order: 1 Pkt. (600 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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Annuals Tour #1
Take a garden tour and see favorite annual plants in a garden setting. In this video- Zinnia, Angelonia, Marigold, Petunia, Celosia and Vinca.
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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 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 4.4 out of 5 by 12.
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
Rated 4 out of 5 by from Easy, reliable but... I'll add myself to the list of those for whom this plant grew taller than the indicated height, but this disappointed me a little as it towered over the rest of my garden and looked out of place. They weren't as prolific for me as I would have hoped, but others seem to have had better luck and a disproportionate number of plants were the same mauve color. That said, they are great because they're so easy to grow with strong stems (even at 6-7 feet no staking required), make great cut flower and have very attractive, wispy foliage.
Date published: 2011-02-15
Rated 5 out of 5 by from Dependable, beautiful, and bountiful! I've been planting these beauties for many years now--in two different homes. They are the MOST dependable seeds I've ever planted. They never fail. And they never fail to produce beautiful flowers. Mine frequently grow to more than 6 feet tall! When friends come to visit, they marvel at the strength and proliferation of the flowers. They comment on my green thumb, and I snicker to myself. Little do they know I just sprinkle these seeds in the garden randomly, toss a little soil over top (sometimes), and let them do their thing. They even re-seeded themselves one year when I forgot to order the seeds. I love these flowers in a wild, random area of my garden. The goldfinches love them, which is a bonus, since I love to see those little cuties outside my back window in the morning. Can't imagine it being summer with Cosmos. I HIGHLY recommend these flowers, particularly for novice gardeners. You'll look like a master gardener!
Date published: 2011-01-08
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