Cosmos
Cosmos bipinnatus
A fast, low-maintenance warm-weather annual from Mexico and the southern United States, grown for saucer-shaped, daisy-like flowers (2-4 inches across) with red, pink or white rays around a yellow center. The lacy, threadlike bipinnate foliage gives an airy texture, and the long bloom run from early summer to frost makes it a workhorse for cutting and cottage gardens. It flowers best in lean soil — overly rich, fertile ground produces leafy plants with fewer blooms.
Climate fit: moderate (64/100)
Filler
Pollinator
Border
Light
Full sun
Water
Moderate water
Mature size
12-48" tall · 18" apart
Lifecycle
True annual (one season)
AHS heat range
6-12
Plant range authored in AHS heat-zone terms.
Native in Illinois
No
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An open, daisy-like composite that is freely visited for nectar and pollen.
Cold hardiness
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
✓
Well-suited today and still thriving in 2050.
Heat tolerance
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...
Where this plant fits
Suitable across 45 ecoregions — 45 climate-resilient through 2070. Best matches first.
Appalachian mixed mesophytic forests
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Appalachian-Blue Ridge forests
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Arizona Mountains forests
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Atlantic coastal pine barrens
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Blue Mountains forests
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California coastal sage and chaparral
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Canadian Aspen forests and parklands
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Central Pacific Northwest coastal forests
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Central Tallgrass prairie
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Central-Southern Cascades Forests
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Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
Zinnia elegans
Common zinnia
An old garden-favorite annual native to Mexico, grown for showy daisy-like flowers in nearly every color but true blue — red, yellow, orange, pink, rose, lavender, green, and white. Bushy, leafy plants rise on upright, hairy, branching stems and bloom continuously from early summer to frost. A magnet for butterflies and hummingbirds, and one of the most reliable cut-and-come-again cutting-garden flowers.
Eschscholzia californica
California poppy
The California state flower — a drought-tolerant southwestern native perennial (grown as annual outside zones 8-10) producing iconic vibrant orange (sometimes yellow, pink, red, or white in cultivars) cup-shaped flowers that open in sun and close at night or in cloudy weather. Naturalizes readily via self-seeding; among the most reliable hot-dry-site wildflowers for borders, meadow plantings, and rock gardens. Family Papaveraceae but unrelated to the opium poppy (different chemistry, no narcotic alkaloids).
Gaillardia pulchella
Firecracker blanketflower
A fast, sun-loving member of the aster family grown as a warm-season annual, Gaillardia pulchella throws a long succession of 2-inch daisy-like flowers from early summer until frost. The ray florets blaze in bands of red and gold around a darker domed center — the firecracker coloring that gives it its name — on a wiry, branching 12-24 inch clump. It is built for hot, dry, sunny ground where richer-fed bedding plants sulk, blooming hardest exactly when summer heat peaks.
Rudbeckia fulgida
Black-eyed Susan
A tough, bright perennial for sunny borders, pollinator patches, and late-summer color.
Epilobium canum
California fuchsia
A drought-hardy western-native subshrub (long known as Zauschneria) that lights up dry, rocky ground with scarlet tubular flowers from midsummer until frost — exactly when migrating and resident hummingbirds need a late-season nectar source. Slender, highly-branched stems carry small grey-green lance-shaped leaves; the whole plant thrives on full sun, lean soil, and very little water once established.
Gaillardia aristata
Common blanketflower
A sun-loving, drought-tolerant short-lived perennial in the daisy family, prized for its long succession of red-and-yellow banded daisy flowers from early summer to frost. Native to western and central North America, it thrives on lean, sharply drained soils and is one of the most reliable pollinator plants for hot, dry full-sun beds — provided it never sits in wet feet.
Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Cosmos (Cosmos bipinnatus). Retrieved 2026, June 24, from https://plotwright.com/plants/cosmos-bipinnatus
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
Missouri Botanical Garden PlantFinder
Botanical research database
Backs 17 fields
Identity
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