Giant Blue Cohosh

Caulophyllum giganteum

Giant Blue Cohosh

Mason Brock (Masebrock)

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Berberidaceae
Genus:
Caulophyllum
Species:
Caulophyllum giganteum

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
2-3 ft
Light Requirements:
Part Shade
Drought Tolerance:
High
Bloom Months:
mar, apr, may
Bloom Colors:
Red, Yellow, Purple, Brown

Native Range

United States: Kentucky, Massachusetts, Michigan, North Carolina, New Hampshire, New York, Ohio, Pennsylvania, Tennessee, Virginia, Vermont, West Virginia, Canada: Ontario, Quebec

Keystone Species Ranking

Caterpillar Keystone:
★★★★★ Based on number of butterfly and moth species using this genus as host plant (Source: National Wildlife Federation)

Host Plant for Caterpillars

Norman's Quaker (Crocigrapha normani)

Soil Requirements

Soil Type:
rich, well-drained loamy soil
pH:
5.5 - 6.5 (slightly acidic to neutral)
Drainage:
good drainage required
Moisture:
consistently moist
Notes:
prefers shaded, forested environments

Germination Information

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Cold-moist stratification for 60 days.

Source: OpenAI GPT-4o