Photo by Melody

PlantFiles: Common Cosmos, Mexican Aster
Cosmos bipinnatus 'Yellow Garden'

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

One vendor has this plant for sale.

5 members have or want this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

18-24 in. (45-60 cm)

Not Applicable

Sun Exposure:
Full Sun

Parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
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)
7.9 to 8.5 (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 seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

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No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral saya On Sep 8, 2013, saya from Heerlen
Netherlands (Zone 8b) wrote:

Comparing with the more common grown Cosmos bipinnatus it is flowering later in the season. In my garden it started to flower early August. The flowers are also smaller. In its display it did'nt make me say 'wow', so I'm not sure if I will grow it again next year.


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

Calistoga, California
Richmond, California
San Jose, California
Barbourville, Kentucky

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