Caulophyllum Plant Growing & Care Guide for Gardeners

Article by Dean Ravenscroft, Ph.D. - Updated 22nd Nov 2023

In this Gardener's HQ guide, we'll explore cultivating Caulophyllum plants in your garden, indoor spaces, and other settings.

At a Glance: Caulophyllum

Plant Characteristics: Caulophyllum offers unique foliage and distinct blue berries, adding a rare beauty to gardens. Its hardiness makes it a reliable choice for diverse climates.
Ideal Growing Conditions: Prefers rich, well-drained soil and thrives in both full sun and partial shade. Consistent moisture enhances its growth and berry production.
General Care: Low maintenance, requiring minimal pruning. Seasonal mulching helps maintain soil moisture and temperature.
Tips for New Gardeners: Blue cohosh is beginner-friendly, demanding little beyond basic care. Focus on maintaining soil moisture and avoiding overexposure to intense sunlight.

Blue Cohosh: Cultivation & Garden Use

Caulophyllum is a hardy perennial that reaches heights of 50 to 90 cm (20 to 36 inches).

They have compound juvenile leaves of blue-green, and green adult leaves. Plants bloom in May, and this is followed by pretty fruits of blue.

Caulophyllum plants have the common names of Blue Cohosh, Papoose root, and Squaw root. Latin names include Caulophyllum thalictroides.

Caulophyllum thalictroides
Caulophyllum thalictroides (Blue Cohosh) by Jason Hollinger.

Caulophyllum
Caulophyllum; Blue Cohosh Berries by Joshua Mayer.

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Caulophyllum Growing and Care Guide

Common Names: Blue Cohosh, Papoose Root, Squaw Root.
Life Cycle: Hardy perennial
Height: 18 to 36 inches (45 to 90 cm).
Native: Northern America, East Asia.
Family: Berberidaceae.
Growing Region: Zones 4 to 7.
Flowers: Late spring.
Flower Details: Inconspicuous.
Fruit: Blue.
Foliage: Blue-green to green. Lobed. Compound.
Sow Outside: Grow from roots.
Roots: 1 inch (2.5 cm) Start of autumn. Spacing 12 to 18 inches (30 to 45 cm).
Sow Inside: No
Requirements: Partial or full shade. Deep soil, wood like soil, moist soil. pH 4.5 to 6.5. Winter mulch. Water to keep soil moist at all times. Supply a leaf mulch to maintain moisture. Once established do not disturb. Propagate: by dividing Caulophyllum in the spring or at the start of autumn. Or take rhizome cuttings.
Miscellaneous: Often used for alternative medical use, especially with childbirth and menstrual issues. The plant is poisonous, and should especially be avoided by pregnant women.

How to Grow Caulophyllum

Blue Cohosh and other Caulophyllum plants should be grown outdoors. Plant the roots at a depth of 2.5cm (1 inch) into a location with a moist, wood soil of pH 4.5 to 7.

They should be spaced at about 30 to 40 cm (12 to 16 inches) apart. It is imprtant that they grow in shady areas.

Caring for Blue Cohosh

Further plants can be created by dividing the plants in early autumn. Alternatively take cuttings from the roots (complete with rhizomes). Do not eat these plants as blue cohosh can induce labor!

Common Questions

How many members does the Caulophyllum genus have?

The Caulophyllum genus consists of about two species.

Do members of Caulophyllum make a good garden or landscaping plant?

Yes, Caulophyllum thalictroides (Blue Cohosh) can be a unique and attractive addition to a woodland or shade garden.

Which Caulophyllum species are most frequently grown by gardeners?

The species most frequently grown by gardeners is Caulophyllum thalictroides (Blue Cohosh).

Are members of the Caulophyllum plant genus fragrant?

No, Caulophyllum plants are not known for having a fragrance.

What is the perfect location to grow Caulophyllum?

Caulophyllum thrives in part to full shade with rich, moist soil, making it suitable for a woodland garden.

Is Caulophyllum invasive in the USA?

At present, Caulophyllum is not considered invasive in the USA.

How do I remove Caulophyllum plants from my garden?

Remove Caulophyllum by carefully digging out the plant, ensuring to remove all roots to prevent regrowth.

Summary

The Caulophyllum genus, also known as blue cohosh, is part of the Berberidaceae family, native to North America. This perennial herb is recognized for its bluish-green foliage and small, greenish-yellow flowers that bloom in early spring.

To cultivate Caulophyllum, plant them in a shaded to partially shaded location with moist, well-drained soil. They can be grown from seeds or rhizomes, but take several years to mature. Regular watering is needed, but they prefer to be left undisturbed once established. They're often used in woodland gardens or as ground cover.

I hope that you found this guide on how to grow Caulophyllum plants in your garden. You may also enjoy my gardening guides on how to grow Berberis thunbergii, Heavily Bamboo, Podophyllum plant, and Epimedium plants.

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