Photo by Melody

PlantFiles: Blue Cohosh, Papooseroot
Caulophyllum thalictroides

Family: Berberidaceae (bear-ber-id-AY-see-ee) (Info)
Genus: Caulophyllum (kaw-loh-FIL-um) (Info)
Species: thalictroides (thal-ik-TROY-deez) (Info)

6 vendors have this plant for sale.

7 members have or want this plant for trade.


18-24 in. (45-60 cm)

12-15 in. (30-38 cm)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Light Shade


Bloom Color:
Chartreuse (Yellow-Green)

Bloom Time:
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By Kathleen
Thumbnail #1 of Caulophyllum thalictroides by Kathleen

By Equilibrium
Thumbnail #2 of Caulophyllum thalictroides by Equilibrium

By Equilibrium
Thumbnail #3 of Caulophyllum thalictroides by Equilibrium

By gregr18
Thumbnail #4 of Caulophyllum thalictroides by gregr18


1 positive
1 neutral
No negatives

Gardeners' Notes:

Neutral purplekitty On Feb 2, 2010, purplekitty from Wildomar, CA wrote:

Used to induce labor. DO NOT ingest if pregnant unless certified health practitioner is trying to induce contractions.

Positive gregr18 On Jun 4, 2007, gregr18 from Bridgewater, MA (Zone 6b) wrote:

It's not uncommon to see this plant for sale (in capsulated form of course) at a drug store as a remedy for women's reproductive problems. It has long been used in traditional Native American medicine as a means of easing the process of childbirth and menstruation.


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

Calvert City, Kentucky
Bridgewater, Massachusetts
Panama, New York
Elizabeth City, North Carolina
Bowling Green, Ohio
Cincinnati, Ohio
Mc Minnville, Tennessee
Viola, Tennessee

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