Index / Search / Achillea millefolium var. occidentalis
§1 Plant
Achillea millefolium L. var. occidentalis DC.
vernacular western yarrow — variety · Asteraceae
§2Habit & range
Habit and range
- Growth habit
- Forb/herb
- Duration
- Perennial
- Group
- Dicot
- Family
- Asteraceae Bercht. & J. Presl
- Genus
- Achillea
§2a
Native status, by region
- AK Alaska Native
- CAN Canada Native
- GL Greenland Native
- L48 Lower 48 States Native
- SPM St. Pierre & Miquelon Native
§2b
County-level range
· 21 counties across 1 state§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Medium
- Shade
- Medium
- Moisture use
- Medium
- Fire
- High
- Salinity
- Low
- Anaerobic
- None
- CaCO₃
- Medium
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- -38 °F minimum
- Frost-free days
- 100 min.
- Precipitation
- 8–26 in/yr
- pH range
- 6–8
- Root depth
- 8 in min.
- Fertility need
- Low
- Soil texture
- coarse, medium
§3c
Form & growth
- Growth form
- Rhizomatous
- Growth rate
- Moderate
- Lifespan
- Moderate
- Mature height
- 3 ft
- Foliage texture
- Fine
- Foliage colour
- Green
- Porosity (summer)
- Porous
- Porosity (winter)
- Porous
- Flower colour
- White
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- Slight
§3d
Reproduction
- Bloom period
- Late Spring
- Seed abundance
- Medium
- Seed begins
- Summer
- Seed ends
- Fall
- Spread rate
- Moderate
- Stratify
- No
- Seeds / lb
- 3,411,818
- Propagation
- seed, sprigs
§3e
Use & availability
- Commercial availability
- Routinely Available
- Nursery stock
- No
- Browse palatability
- Low
- Graze palatability
- Low
- Palatable, human
- No
- Protein potential
- Low
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 21 counties across 1 state.
Montana view state ↗ 21 N ▾
- Big Horn 30003
- Blaine 30005
- Carter 30011
- Custer 30017
- Daniels 30019
- Dawson 30021
- Fallon 30025
- Fergus 30027
- Garfield 30033
- Golden Valley 30037
- McCone 30055
- Park 30067
- Petroleum 30069
- Phillips 30071
- Powder River 30075
- Richland 30083
- Roosevelt 30085
- Sheridan 30091
- Treasure 30103
- Valley 30105
- Wibaux 30109
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/ACMIO ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/4215536 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-25
fetched 2026-05-25T18:27:19Z