Cosmos, Common Cosmos, Mexican Aster 'Seashells'

Cosmosbipinnatus

Family
Asteraceae (ass-ter-AY-see-ee)
Genus
Cosmos (KOS-mus)
Species
bipinnatus (by-pin-NAY-tus)
Synonym
Sun Exposure
Full Sun
Foliage
Textured
Height
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
Spacing
18-24 in. (45-60 cm)
Hardiness
Not Applicable
Danger
Parts of plant are poisonous if ingested
Bloom Color
Pink
Red
White/Near White
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Other Details
Category
Annuals
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Blue-Green
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
Soil pH requirements
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)
Patent Information
Propagation Methods
From seed; sow indoors before last frost
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored
Regional

This plant is said to grow outdoors in the following regions:

Lawndale, California

San Leandro, California

Barbourville, Kentucky

Provincetown, Massachusetts

Saint Paul, Minnesota

Madison, Mississippi

Dolgeville, New York

Elizabeth City, North Carolina

Toledo, Ohio

Portland, Oregon

Warwick, Rhode Island

Leesburg, Virginia

Kalama, Washington

Black Earth, Wisconsin

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Featured Videos

Gardener's Notes:

2
positives
2
neutrals
0
negative
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Sort By:
B
Black Earth, WI | July 2012 | neutral

Planted on May 14, after an exceedingly hot/dry summer I have 5-6 foot stalking green fringy plants, but no flowers yet. I have been tol...Read More

S
Los Angeles County, CA (Zone 10a) | August 2010 | positive

These turned out really well in my parent's garden! I got tired of the same old common single variety and found these. Glad to find they ...Read More

L
Portland, OR (Zone 8b) | July 2009 | positive

I needed something that would be a tall screen, and I got it with the Seashell mix! The Ed Hume package told the truth, they really do ge...Read More

B
Lakemont, GA (Zone 8a) | March 2007 | neutral

Also known as 'Sea Shells Mixture'.
Exotic tubular flowers in shades of pink, red, and white. A real eye-catcher in any garden. Ex...Read More

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