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Blue Cohosh
Caulophyllum thalictroides
Blue Cohosh, is a perennial forb native to the woodlands of eastern North America. It typically grows to about 2 to 3 feet in height and is characterized by its pinnately compound leaves, which are an unusual bluish-green color. In early spring, before the foliage fully unfolds, Blue Cohosh produces small, yellowish-green flowers that are crucial for early pollinators. These flowers give way to deep blue berries in late summer, which contrast with the surrounding foliage. Blue Cohosh prefers rich, moist, well-drained soil in shaded or semi-shaded areas, making it ideal for underplanting beneath deciduous trees or incorporating into naturalized woodland settings.
Details
Height12” - 24”
Spread12"
Bloom SeasonApril – May
Soil Types
Loam
Sand
Soil Moisture
Medium
Sun Exposure
Full Shade
Part Sun
Range Map
Available
Not available
Ecological Benefits
Maintenance Tips
- Thrives in moist conditions; water regularly to maintain evenly moist soil, especially in dry spells.
- Minimal pruning is required. Remove any dead or damaged foliage as necessary to maintain plant health and aesthetics.
- Prefers humus-rich, well-drained soil; amend with organic matter to improve soil fertility and structure.
- Apply a layer of organic mulch to help retain soil moisture, suppress weeds, and provide a clean visual background for the distinctive foliage.
- Monitor for slug and snail damage, which can be a problem in moist, shaded areas. Use environmentally friendly methods to control these pests if necessary.





