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Garden cosmos
Also known as: Annual cosmos
Garden cosmos (Cosmos bipinnatus) is a herbaceous annual plant often cultivated as an ornamental in temperate regions. Due to its self-sowing ability, garden cosmos can grow on the same spot for several years, even though it is an annual. Not surprisingly, this quality also made it an invasive species in certain areas of the world.
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Annual
Lifespan
Herb
Plant Type
Mid summer, Late summer, Fall, Early winter
Bloom Time
Spring, Summer
Harvest Time
61 cm to 2.5 m
Plant Height
40 cm
Spread
Green
Leaf Color
5 cm to 10 cm
Flower Size
White, Pink, Yellow, Red, Purple, Orange, Cream
Flower Color
Green, Red, White, Pink
Stem Color
Winter dormancy
Dormancy
Deciduous
Leaf type
20 - 38 ℃
Ideal Temperature
Spring, Summer, Fall
Growth Season
Rapid
Growth Rate

Images of Garden cosmos

Distribution of Garden cosmos

Distribution Map
Garden cosmos is native to Mexico. Loved for its beauty as a garden plant, it has been introduced to much of the United States and South America as well as the southern half of Africa, west and central Europe, and many Pacific islands, including Australia. It has escaped cultivation and has naturalized in grassy and disturbed areas.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Roadsides, waste places
Hemisphere Trend Curve
Flowering
Fruiting

Culture

Garden Use
Garden cosmos is a classic in gardens and park spaces. With bright, showy blooms that grow tall, it is a popular choice as a flowerbed planting that beautifies and brightens a landscaped area. It is also appreciated for its ability to attract both birds and butterflies. Its flowers pair well with marigolds, zinnias, and dahlias due to their similar size and requirements.
Symbolism
Persistent happiness, order, harmony
Interesting Facts
The garden cosmos represents science. Why? The story goes that it was once chosen to be given to Saint Felix, the dean of the monastic college in Oxford. He made great contributions to the development of Oxford and Oxford University. It can be said that he is the patron saint of knowledge. Another saying about it is that it represents wild beauty and eternal happiness.
Name Story
Garden cosmos: "Cosmos" is from the Greek language, meaning a harmonious and orderly universe. Contrary to "chaos", Cosmos is used to describe how these charming flowers bring colors to gardens, so it is called the garden cosmos.
Mexican aster: Aster comes from latin, meaning "star" because of the shape of its flowers. It is a plant native to Mexico, so it is called Mexican aster.
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Quickly Identify Garden cosmos

1
Daisy-like flowers in maroon, pink, lavender, and white colors.
2
Symmetrical, saucer-shaped blooms with yellow centers.
3
Narrow, cylindrical-fusiform fruit with distinctive beak and erect awns.
4
Lacy, deeply cut leaves with a fern-like appearance and fine texture.
5
Erect, unbranched stem with smooth texture and variable green coloration.
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Care Guide for Garden cosmos

Every week
Water
Full sun
Sunlight
20 - 38 ℃
Ideal Temperature
Water: Garden cosmos thrives in meadows and open scrub, requiring moderate watering that reflects its native rainfall patterns. While it prefers consistent moisture, it tolerates short dry spells. For optimal growth, weekly watering is recommended, enhancing its vibrant blooms as an annual flowering plant.
Fertilize: Fertilizing garden cosmos boosts blooms and vigor. Use high-phosphorus fertilizers monthly, spring to early fall, at 2-4 ounces per square yard to avoid root burn. Adjust frequency during growth and water after fertilization. Balance is crucial; over-fertilization can harm foliage.
Pruning: Garden cosmos is an annual noted for feathery leaves and daisy-like flowers. Prune in early spring, deadhead spent blooms, and remove damaged parts to enhance health and bloom duration. Sterilize tools to prevent disease. Consult horticultural resources for detailed techniques.
Propagation: Propagation of garden cosmos occurs in Spring through sowing. Maintain moist soil until germination, which typically takes 1-2 weeks. For optimal growth, ensure full sun exposure and use well-draining soil.
Repotting: Garden cosmos requires excellent drainage when planted in pots to thrive effectively.
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