Hairy Clematis
Clematis hirsutissima
- Native to:
- United States
iNaturalist: © nancy_jarvis (iNaturalist #124651549)






Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Ranunculaceae
- Genus:
- Clematis
- Species:
- Clematis hirsutissima
- USDA Symbol:
- CLHI
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb , Subshrub
- Height:
- 60 cm
- Light Requirements:
- Part Shade
- Drought Tolerance:
- High
- Bloom Months:
- apr,may,jun,jul
- Bloom Colors:
- purple, blue, lavender
Wildlife Benefits
- Bees:
- ★☆☆☆☆ Documented bee visitation (GBIF)
- Butterflies & Moths:
- ★☆☆☆☆ Documented Lepidoptera association (GBIF)
Keystone Species Ranking
- Caterpillar Keystone:
- ★★☆☆☆ Butterfly & moth species supported by this genus (NWF)
Garden & Ecology Notes
- Wildlife Value:
- bees, butterflies
- Deer Resistant:
- Yes
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Resprouts from deep taproot following fire; associated with fire-maintained mountain grasslands and meadows.
Soil Requirements
- Soil Type:
- well-drained, sandy or gravelly soil
- pH:
- 6.0 - 7.5 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- prefers open, rocky slopes and prairies
Propagation & Germination
- Stratification:
- Cold/moist stratification required — 60–90 days
- Germination Time:
- 14–60 days
- Notes:
- Seeds require cold stratification and may germinate erratically over several weeks.
The above propagation data sourced from Claude AI
Pre-treatment: Seeds are placed in cold moist stratification for 112 days
Establishment: C. hirsutissima is found from southeastern British Columbia to eastern Washington and Oregon and east to Montana and Wyoming.
Source: npn.rngr.net
ORGHPS Germination Guide: Expose to fluctuating outdoor winter temps incl. freezing for 3 months. Increase light/temp in spring.