Index / Search / Frangula purshiana
§1 Plant
Frangula purshiana (DC.) A. Gray
vernacular Cascara buckthorn — species · Rhamnaceae
§2Habit & range
Habit and range
- Growth habit
- Shrub, Tree
- Duration
- Perennial
- Group
- Dicot
- Family
- Rhamnaceae Juss.
- Genus
- Frangula
§2a
Native status, by region
- CAN Canada Native
- L48 Lower 48 States Native
§2b
County-level range
· 4 counties across 1 state§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Medium
- Shade
- Low
- Moisture use
- Medium
- Fire
- Medium
- Salinity
- None
- Anaerobic
- None
- CaCO₃
- Low
- Hedging
- Medium
§3b
Climate & soil
- Cold tolerance
- -3 °F minimum
- Frost-free days
- 150 min.
- Precipitation
- 14–45 in/yr
- pH range
- 5.9–7.9
- Root depth
- 24 in min.
- Fertility need
- Low
- Soil texture
- coarse, medium
§3c
Form & growth
- Growth form
- Multiple Stem
- Growth rate
- Slow
- Lifespan
- Long
- Mature height
- 35 ft
- Height @ 20 y
- 20 ft
- Foliage texture
- Coarse
- Foliage colour
- Dark Green
- Porosity (summer)
- Dense
- Porosity (winter)
- Moderate
- Flower colour
- White
- Fruit colour
- Black
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Mid Spring
- Seed abundance
- High
- Seed begins
- Spring
- Seed ends
- Summer
- Spread rate
- Slow
- Stratify
- Yes
- Seeds / lb
- 12,300
- Propagation
- seed, cuttings, bare root, container
§3e
Use & availability
- Commercial availability
- No Known Source
- Nursery stock
- Yes
- Palatable, human
- No
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 4 counties across 1 state.
Montana view state ↗ 4 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/FRPU7 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/8286637 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-25
fetched 2026-05-25T18:27:19Z