This plant is not native to Canada, but is a very popular annual. With finely cut leaves, showy flowers and a long blooming season, Cosmos are quite hardy, blooming profusely from early or midsummer until fall, depending on varieties. This Mexican native looks striking when planted in masses or filling out mixed plantings.
Botanical Name: Cosmos bipinnatus
Nom Français: Cosmos bipinnatus


Bloom colour: Red | White | Yellow
Blooms: Summer - Zone 5
Pollinators: Bees | Butterflies
Sun or Shade:
Plant Type: Perennial
Height: Up to 4 feet (120 cms)
South America, Central America, Northern-south America.
It grows well in hardiness zones: 2-11

Cosmos are freely flowering annual plants in the asteraceae or sunflower family. They are super easy to grow. If you're looking for a flower that will stay in bloom for months and can be grown easily by scattering seeds, cosmos are a great choice.


Water requirement: Tolerates drought
Tolerant of most soil pH levels, but grow best in neutral to alkaline soils.
Sow seeds directly in soil after the threat of frost has ended. Young plants may be transplanted from pots at this time. Rich soil will encourage foliage rather than blooms, so it is not necessary to make any special soil preparations.
Sow seeds indoors 4 to 6 weeks before the last frost date in pots with good seed-starting mixture. As soon as they’re 3 or 4 inches tall. move them into bigger pots. As cosmos can be invasive, growing them in pots in some areas is recommended.


Cosmos grow easily in beds, and they make great cut flowers. When established, the plants can handle drought, poor soil conditions, and general neglect. They even self-sow. May reseed, for a surprise return next season, if dried flower heads are left intact.
1-3 feet wide, up to 6 feet tall.
Susceptible to stem canker, powdery mildew, aphids, flea beetles or gray mould. These are easy to control with insecticidal soap, or by spacing plants accordingly to ensure quality air flow.


Spread: Up to 6 feet, 1-3 feet wide.
Remove spent blooms to prolong flowering.


Cut flowers last more than a week in fresh bouquets. Saucer-like blooms stand out against a backdrop of fine, airy foliage. Cosmos also attract birds, bees and butterflies.

Styling and Use

Ideal choice for beds, borders, and cutting gardens. Excellent backing plant for mixed borders.
Baby's Breath, Coreopsis, Russian Sage, Daisies, Asters, Black-eyed Susans, many more choices.


The word "Cosmos" comes from the Greek word meaning "harmony and ordered universe."


Cosmos plants were brought back to Madrid in the 16th century by Spanish explorers. Seeds were brought to England in the late 1700's and made their way to the United States around 50 years later. is supported by its readers and advertisers. If you purchase through a link on this site, the site may earn a commission.

If you like the work we are doing, you can also support the site by becoming a member.