Index / Search / Conyza canadensis
§1 Plant — species · Asteraceae
Conyza canadensis (L.) Cronquist
vernacular Canadian horseweed
§2Habit & range
Habit and range
- Growth habit
- Forb/herb
- Duration
- Annual, Biennial
- Group
- Dicot
- Family
- Asteraceae Bercht. & J. Presl
- Genus
- Conyza
§2a
Native status, by region
- AK Alaska Introduced
- CAN Canada Native
- HI Hawaii Introduced
- L48 Lower 48 States Native
- NAV Navassa Island Native
- PB Pacific Basin (except Hawaii) Introduced
- PR Puerto Rico Native
- SPM St. Pierre & Miquelon Native
- VI U.S. Virgin Islands Native
§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Low
- Shade
- High
- Moisture use
- Medium
- Fire
- Low
- Salinity
- None
- Anaerobic
- Low
- CaCO₃
- Low
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- 52 °F minimum
- Frost-free days
- 60 min.
- Precipitation
- 14–55 in/yr
- pH range
- 4.8–7.2
- Root depth
- 6 in min.
- Fertility need
- Medium
- Soil texture
- coarse, medium, fine
§3c
Form & growth
- Growth form
- Single Crown
- Growth rate
- Rapid
- Mature height
- 5 ft
- Foliage texture
- Coarse
- Foliage colour
- Green
- Porosity (summer)
- Porous
- Porosity (winter)
- Porous
- Flower colour
- White
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Indeterminate
- Seed abundance
- High
- Spread rate
- Rapid
- Stratify
- No
- Seeds / lb
- 700,000
- Propagation
- seed
§3e
Use & availability
- Commercial availability
- No Known Source
- Nursery stock
- No
- Palatable, human
- No
- Lumber
- No
- Christmas tree
- No
§4Montana distribution
Recorded in 30 of 56 Montana counties.
Native · 30 counties
- Big Horn 30003
- Blaine 30005
- Carbon 30009
- Cascade 30013
- Chouteau 30015
- Dawson 30021
- Flathead 30029
- Gallatin 30031
- Garfield 30033
- Glacier 30035
- Golden Valley 30037
- Lake 30047
- Lincoln 30053
- Madison 30057
- McCone 30055
- Mineral 30061
- Missoula 30063
- Park 30067
- Petroleum 30069
- Phillips 30071
- Pondera 30073
- Powder River 30075
- Powell 30077
- Richland 30083
- Rosebud 30087
- Sanders 30089
- Teton 30099
- Toole 30101
- Treasure 30103
- Valley 30105
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/COCA5 ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/3146791 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-25
fetched 2026-05-25T16:28:53Z