Agoseris grandiflora (Nutt.) Greene

vernacular bigflower agoseris — species · Asteraceae

USDA: AGGR
GBIF: 3092909
Rank: species

bigflower agoseris (Agoseris grandiflora) — Platephotograph · kevinhintsaCC BY-NC source · iNaturalist ↗

§2Habit & range

Growth habit: Forb/herb
Duration: Perennial
Group: Dicot
Family: Asteraceae Bercht. & J. Presl
Genus: Agoseris

§2a

Native status, by region

CAN Canada Native
L48 Lower 48 States Native

§2b

County-level range

· 1 county across 1 state

Legend Native · 1 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought: Medium
Shade: High
Moisture use: Medium
Fire: High
Salinity: None
Anaerobic: Low
CaCO₃: Medium
Hedging: None

§3b

Climate & soil

Cold tolerance: -13 °F minimum
Frost-free days: 120 min.
Precipitation: 12–20 in/yr
pH range: 5.8–7.3
Root depth: 8 in min.
Fertility need: Medium
Soil texture: coarse, medium, fine

§3c

Form & growth

Growth form: Single Crown
Growth rate: Moderate
Lifespan: Short
Mature height: 1.8 ft
Foliage texture: Coarse
Foliage colour: Green
Porosity (summer): Porous
Porosity (winter): Porous
Flower colour: Yellow
Fruit colour: Brown
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Spring
Seed abundance: Medium
Seed begins: Summer
Seed ends: Summer
Spread rate: Moderate
Stratify: No
Seeds / lb: 273,665
Propagation: seed

§3e

Use & availability

Commercial availability: No Known Source
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 1 county across 1 state.

Montana view state ↗ 1 N ▾

Sanders 30089

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/AGGR ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/3092909 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

fetched 2026-05-25T18:27:19Z