Categories: Flowers

4 Cosmos for Your Cutting Garden

By Published On: January 22, 2018
4 Cosmos for Your Cutting Garden

Cosmos sulphureus ‘Polidor,’ ‘Fruit Crush,’ ‘Cosmic Orange,’ or ‘Bright Lights’

It often happens that the best flowers are also easy to grow, and Cosmos is definitely in this category. If you’d like to start a cut flower garden, attract pollinators, or simply add color and texture to your landscape, veggie beds, or borders, cosmos may be exactly what you’re looking for.

Cheat Sheet for Growing Cosmos

  • An annual or herbaceous perennial originally heralding from Mexico and parts of North America.
  • Cosmos atrosanguineus, or chocolate cosmos, is a popular perennial that is typically propagated from root cuttings.
  • Grow annuals from seed or nursery starts.
  • Start annuals from seed indoors 4 to 6 weeks before your last spring frost or direct sow in spring after last chance of frost is past. Can be scatter sown in fall in mild climates such as hardiness zones 9 through 11.
  • Seedlings grow quickly, so starting seeds indoors plan to pot them up once they’re a few inches tall to encourage continued growth.
  • Not too fussy about soil.
  • Requires full sun.
  • Water moderately when taking hold but it’s possible to reduce watering once mature, though you’ll get more consistent blooms with consistent watering.
  • In all honestly, Cosmos can practically be ignored and still continue to thrive.
  • Blooms about 7 weeks after germination and continues to bloom until your first all frost.
  • Deadhead to encourage blooming.
  • Choose from a great number of cultivars that vary in color, shape, and size. 
  • Protect taller varieties from strong, summer winds with simple stakes, much like you would with dahlias.
  • Cosmos are happy to self-sow depending on your climate and in some instances can become weedy. Be prepared to strategically move volunteers for optimal placement and give extras away to friends and neighbors (they’ll love you for it).

Cosmos bipinnatus ‘Lemonade’

Cosmos sulphureus ‘Polidor,’ ‘Fruit Crush,’ ‘Cosmic Orange,’ or ‘Bright Lights’ (top photo) is a mix of bright yellow and tangerine blooms. It’s an annual that grows to about 2 feet tall and produces masses of blooms with semi-double petals that are gorgeous when planted in drifts. This particular species is also edible. Use flowers in salads or as a garnish for a splash of color and try adding young leaves to salads. However, it’s important to note that only Cosmos sulphureus is edible.

Cosmos bipinnatus ‘Lemonade’ (above) is as dreamy as it looks. With a warm, unique way of catching the light, it’s soft yellow blooms pair well with most other hues in the garden. It’s an annual that blooms about 10 weeks after sowing, so start it a little earlier than others with quicker bloom times. Grows about 2 feet in height.

Cosmos bipinnatus ‘Sensation’ AAS Winner 1936

Cosmos bipinnatus ‘Sensation’ produces large blooms often measuring 3 to 4 inches across and can be found in white, pink, and magenta. Another annual, ‘Sensation’ grows to about 4 feet tall or taller.

This particular cultivar has long been a garden favorite, receiving it’s first award as an All America Selections winner is 1936!

Cosmos bipinnatus ‘Cupcakes White’

Cosmos bipinnatus ‘Cupcakes White’ is an annual cosmos with a twist. The original, 5 free petaled form is now a fusion of petals forming a cup-like shape. You’ll find it has a light, airy appeal that catches the breeze and seems to float above borders and beds. Like ‘Sensation,’ it grows to about 4 feet in height.

Voted in 2016 as the Royal Horticulture Society visitor’s favorite, it’s worth planting to simply see it for yourself.

Cosmos bipinnatus ‘Cupcakes White’

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About the Author: Emily Murphy

I’ve learned there’s something wonderfully powerful in the simple act of growing. Here, in our gardens, we can repair ourselves and our plots of earth with our own two hands. GROW WHAT YOU LOVE and GROW NOW!

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  1. suvro March 26, 2019 at 6:34 am - Reply

    Hi – I grow cosmos pretty successfully in rather lousy soil. It’s gravely and full of clay right up against my house so I don’t know far the roots can dig in but oddly they do well. I planted some in a terra-cotta pot that’s about 12 inches high with potting soil and they have grown really tall – over 12 inches- no buds at all ! What do you think ?

    • Emily Murphy May 29, 2019 at 2:23 pm - Reply

      Hi! Thanks for writing and sorry for the late response. (I think your comment came in when I was traveling – sorry about that.) Cosmos aren’t too picky about soil, you’re right. They find a way to grow wherever they’re planted. If your plants in the 12″ container haven’t yet flowered, it could be they need a boost of phosphorus. Try top dressing with worm castings or bone meal. Best of luck!

  2. Ann February 10, 2018 at 4:22 pm - Reply

    I love cosmos! I bought some seeds last year and they bloomed beautifully. Thinking about adding them to my garden again this year. I love how easy they are to grow, especially since I only started gardening a few years ago.

    • Emily Murphy February 11, 2018 at 9:08 am - Reply

      Hi Ann, thanks for writing! Cosmos are wonderful, aren’t they? I plan to grow more this year too — they’re so happy to grow. ;) Best, Emily