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Cosmos, Bright Lights Mixed Colors Seeds

Short Description

Semidouble 2-3" blooms in a vibrant color mix.

Full Description

Lacy foliage and silky flowers give an airy touch to the garden from midsummer to frost. Wonderful for cutting. Tolerates poor soil, heat and humidity. Easy to grow. Grows best in full sun. Attracts Butterflies. Proven tops for performance and adaptability. Space 12-15" apart. Start outdoors after danger of frost.
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Order: 1 Pkt. (300 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 inches

Spread The width of the plant at maturity.

14-16 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.


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 inches
14-16 inches
Ornamental Use
Borders, Cut Flowers
Life Cycle
Sow Method
Direct Sow
Bloom Duration
10 weeks
Flower color
Gold, Orange, Red, Yellow
Cosmos, Bright Lights Mixed Colors is rated 4.3 out of 5 by 24.
Rated 5 out of 5 by from easy flower to grow, even you brown thumbs I bought thirty packets of these, plus cosmic orange cosmos at a local nursery last year and people don't seem to understand that you direct sow outdoors after a frost (not in seed starter trays) and the #1 reason they grow too large is you never fertilize this plant or compost and make the soil too rich or they will grow out of control(too much foliage and too tall and flower very little), they thrive in poor soil and love full sun. For a shorter more compact version try cosmic orange cosmos, it is an unbeatable performer and disease ,drought and pest free variety super floral abundant and reseeds itself all through the fall.
Date published: 2019-04-07
Rated 3 out of 5 by from Beautiful, but only orange I Purchased the seeds from Burpee and grew them a few years ago. They were so beautiful and colorful that my mom also bought some too. This year when I was going through the catalog, I spotted them again and decided to buy them. They are still a beautiful flower, but The only color that bloomed was orange. There are also a lot taller this time around. I will probably not by the seeds again because I really wanted a shorter more colorful variety.
Date published: 2018-09-06
Rated 5 out of 5 by from Cosmos are beautiful flowers As in Boston it is still cold outside, I sowed indoor last week. This is the first time I am planting this flowers. In just 5 days the seeds germinated and I can see the long, thin and delicate seedlings. Probably I will plant them outdoor in May. By the time here the temperatures will become warmer.
Date published: 2018-04-07
Rated 1 out of 5 by from Disappointed I planted my seeds in my Burpee seed starting tray, kept the cells moist and in a sunny location. It's been three weeks now, and no sign of sprouting. I'd appreciate any suggestions you can give me. (I'm in Zone 9.)
Date published: 2018-04-04
Rated 5 out of 5 by from Prolific! I've been growing these for three years now and not only are they dependable, they reseed like crazy! So be carefull where you plant them. Mine are now growing along our pasture fence and surprisingly, the cows couldn't care less about them. If you exhibit at the area fairs in flower shows, they are a good choice for that too. But if you want exhibit them for fall, plant some seeds later like June or early July (southeast) so you will have fresher, bushier flowers and foliage.
Date published: 2018-03-05
Rated 4 out of 5 by from Be Careful Where You Plant These! I've been growing these cosmos every summer for over 10 years now. Last year I amended my soil to improve it. I must have improved it too much because these plants, that normally only grow about 24-36 inches, suddenly shot up to 8 feet tall. Not sure if was a breeding issue with the seed or if they just went gang-busters because they were planted in very fertile soil. Either way....I won't plant them again in those beds. By the end of the summer, they looked like were trying to out-compete my giant sunflowers. I should have taken a picture!
Date published: 2018-01-15
Rated 5 out of 5 by from Beautiful mixed colors I planted these in our hot, humid July weather here in Alabama. They were slow to start. (I didn't water them much - just too hot to get out in the garden.) They survived, grew a little over 2 feet tall - then burst into amazing colors. Yellows, Reds, Oranges, Burgandy. The butterflies and bees flocked to them. I even saw a hummingbird drinking up their nectar one morning. Other reviewers didn't get a lot of different colors, but my plants had a beautiful variety of about 6 different hues.
Date published: 2017-09-02
Rated 5 out of 5 by from Lovely combination of colors We planted these one year and they have reseeded on their own for three years now :-) (The reseeding is easy to control. They're definitely not a "weed.") Very nice mix of excellent, bright colors. They also have a good height that's useful for planting in clusters at the back of our garden along the fence. They bloom wildly and will do it longer and better with dead-heading and some pruning. They definitely slow down by later summer, around early August in our hills, but continue blossoming enough until September. Despite the late summer slow down, still totally worth it. Their colors and their delicate flowers are wonderful.
Date published: 2017-03-18
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