Blue Cohosh
Caulophyllum thalictroides
- Native to:
- Canada, United States, Virgin Islands
iNaturalist: © mmasell (iNaturalist #74189202)
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Berberidaceae
- Genus:
- Caulophyllum
- Species:
- Caulophyllum thalictroides
- USDA Symbol:
- CATH2
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb
- Height:
- 90 cm
- Light Requirements:
- Shade
- Drought Tolerance:
- Low
- Bloom Months:
- apr,may
- Bloom Colors:
- yellow-green, purple
Wildlife Benefits
- Butterflies & Moths:
- ★★☆☆☆ Documented Lepidoptera association (GBIF)
- Caterpillars:
- ★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)
Keystone Species Ranking
- Caterpillar Keystone:
- ★☆☆☆☆ Butterfly & moth species supported by this genus (NWF)
Host Plant for Caterpillars
Garden & Ecology Notes
- Wildlife Value:
- birds, small mammals
- Fall Color:
- yellow
Soil Requirements
- Soil Type:
- rich, well-drained loamy soil
- pH:
- 5.0 - 6.5 (slightly acidic to neutral)
- Drainage:
- tolerates poor drainage
- Moisture:
- consistently moist
- Notes:
- prefers shaded forest understories
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 60–90 days
- Germination Time:
- 30–60 days
- Notes:
- Seeds require cold stratification for 2-3 months; germination occurs in spring after temperatures warm.
Pre-treatment: Seeds are cold-warm-cold stratified
Establishment: C. thalictroides is found within temperate deciduous forests of North America. No germination percentage or time range provided in the protocol.
Source: npn.rngr.net
ORGHPS Germination Guide: Sow immediately, Either the viability of these seeds is short or the species propagates best with fresh seed. Stored seed might be coaxed into germination with temperature cycling and patience. Expose to fluctuation outdoor winter temperatures including freezing for 3 months. Gradually increase light and temperature in the spring. Pulpy coat inhibits germination. Remove by soaking and rinsing in clean water for approximately 7 days. Discard water. * hydrophilic
Where to Buy
Nationwide Seller
- Vermont Wildflower Farm (nursery and seeds)
- Prairie Moon Nursery (nursery and seeds)