Clustered Thistle
Cirsium brevistylum
Matt Lavin from Bozeman, Montana, USA
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Asteraceae
- Genus:
- Cirsium
- Species:
- Cirsium brevistylum
Growth Characteristics
- Life Cycle:
- Annual | Biennial | Perennial
- Growth Habit:
- Forb/herb
- Height:
- 8-12 ft
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- apr, may, jun, jul, aug, sep
- Bloom Colors:
- White, Pink, Purple
Native Range
United States: California, Idaho, Montana, Oregon, Washington, Canada: British Columbia
Keystone Species Ranking
- Bee Keystone:
- ★★☆☆☆ Based on number of native bee species using this genus for pollen and nectar (Source: National Wildlife Federation)
Reported Fauna Sightings
Bees: Fuzzy-horned bumble bee (Bombus mixtus), Fuzzy-horned bumble bee (Bombus mixtus), Yellow head bumble bee (Bombus flavifrons), Yellow head bumble bee (Bombus flavifrons)
Soil Requirements
- Soil Type:
- moist, well-drained loamy soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- good drainage required
- Moisture:
- consistently moist
- Notes:
- prefers riparian zones and wet meadows
Germination Information
Pre-treatment: None required
Establishment: This plant prefers habitats that fall into the categories of either Coastal, Meadow, or West-Side Forest. It can be found in parts of Southeastern Canada as well as portions of Oregon, Washington and Northern California.
Source: npn.rngr.net