Photo by Melody

PlantFiles: Common Cosmos, Mexican Aster
Cosmos bipinnatus 'Sonata Series Mixed'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Cosmos (KOS-mus) (Info)
Species: bipinnatus (by-pin-NAY-tus) (Info)
Cultivar: Sonata Series Mixed

2 vendors have this plant for sale.


18-24 in. (45-60 cm)

12-15 in. (30-38 cm)

Not Applicable

Sun Exposure:
Full Sun

Parts of plant are poisonous if ingested

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Allow seedheads to dry on plants; remove and collect seeds

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By Bug_Girl
Thumbnail #1 of Cosmos bipinnatus by Bug_Girl

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By rebecca101
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No positives
1 neutral
3 negatives

Gardeners' Notes:

Negative rebecca101 On Mar 14, 2008, rebecca101 from Madison, WI (Zone 5a) wrote:

I was not as impressed with the Sonata cosmos as I had hoped. I have grown the standard taller cosmos before, and it did much better for me. This one was kind of weird and gangly looking, and did not bloom as profusely. It also pooped out pretty quickly for some reason. On the plus side it did not topple over in a storm like the taller varieties, and it did bloom earlier. However, I personally would not grow the Sonatas again.

Negative ambest On May 19, 2004, ambest from Riverside, CA wrote:

I have planted this in both poor and good soil, although I adore these, they will not grow for me, the nursery said try not to water very often, they wilted. When the soil is kept moist, they just get leggy and sorry looking. I give up on these beauties. Back to the good old zinnias!

Negative Kaufmann On Aug 23, 2003, Kaufmann from GOD's Green Earth
United States (Zone 8b) wrote:

I planted these in the Spring and they did not do well at all. Guess my soil was too rich. Tall and leggy. I pulled them out.

Neutral Bug_Girl On Jun 14, 2003, Bug_Girl from San Francisco, CA wrote:

I understand that these do well in a poor dry soil, mine are doing ok, in a rich soil, but I think they would bloom more in a poor dry soil. They are very bushy looking.


This plant has been said to grow in the following regions:

San Francisco, California
New Haven, Connecticut
Bellaire, Michigan
New Baltimore, Michigan
Mathiston, Mississippi
Massillon, Ohio
Madison, Wisconsin

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