Sisyrinchium angustifolium Mill.

vernacular narrowleaf blue-eyed grass — species · Iridaceae

USDA: SIAN3
GBIF: 5296015
Rank: species

narrowleaf blue-eyed grass (Sisyrinchium angustifolium) — Platephotograph · Patrick CoinCC BY-NC-SA source · iNaturalist ↗

§2Habit & range

Growth habit: Forb/herb
Duration: Perennial
Group: Monocot
Family: Iridaceae Juss.
Genus: Sisyrinchium

§2a

Native status, by region

CAN Canada Native
L48 Lower 48 States Native

§2b

County-level range

· 3 counties across 1 state

Legend Native · 3 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

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

§3b

Climate & soil

Cold tolerance: -3 °F minimum
Frost-free days: 180 min.
Precipitation: 32–60 in/yr
pH range: 5–7
Root depth: 4 in min.
Fertility need: Low
Soil texture: medium, fine

§3c

Form & growth

Growth form: Bunch
Growth rate: Moderate
Lifespan: Short
Mature height: 2 ft
Foliage texture: Fine
Foliage colour: Green
Porosity (summer): Moderate
Porosity (winter): Porous
Flower colour: Blue
Fruit colour: Black
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Mid Spring
Seed abundance: Low
Seed begins: Spring
Seed ends: Summer
Spread rate: Slow
Stratify: No
Seeds / lb: 757,000
Propagation: seed, bare root, bulb

§3e

Use & availability

Commercial availability: Routinely Available
Nursery stock: No
Browse palatability: Low
Graze palatability: Low
Palatable, human: No
Lumber: No
Christmas tree: No

§4Counties, by state

Recorded in 3 counties across 1 state.

Rhode Island view state ↗ 3 N ▾

§5Sources & provenance

USDA PLANTS

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

plants.usda.gov/SIAN3 ↗

GBIF Backbone

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

gbif.org/species/5296015 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

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