Blue cohosh

Caulophyllum thalictroides

Photo/Illustration: 
Virginia Small
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Blue cohosh (Caulophyllum thalictroides)
kawl-oh-FIL-lum thah-lik-TROY-deez
Genus:  Caulophyllum

This plant's three-lobed, veined leaves are dark purple when they emerge and later turn green. Greenish brown or yellowish brown flowers appear in mid- and late spring, turning into waxy blue berries that dangle beneath the leaves.

Noteworthy Characteristics: 

Berries split open to reveal berry-like seeds that turn from green to blue. Very slow to increase in size.

Care: 

Grow in moist, humus-rich, acidic soil, in part to full shade in a woodland setting.

Propagation: 

Divide in spring while dormant or after blooming. Sow seeds in containers in an open frame; germination is slow and erratic.

Problems: 

Fungal spots sometimes occur.

Overview

Height
1 ft. to 3 ft.
Spread
6 in. to 12 in.
Growth Habit
Clumps
Growth Pace
Slow Grower
Light
Part Shade to Full Shade
Moisture
Medium Moisture
Characteristics
Attracts Song Birds,
Showy Fruit
Bloom Time
Late Spring,
Spring
Flower Color
Niagara
Style
Woodland Garden
Seasonal Interest
Spring Interest
Type
Perennials

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